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In JoVE (1)
Other Publications (200)
- Human Molecular Genetics
- Genes, Chromosomes & Cancer
- Nature Structural & Molecular Biology
- European Journal of Immunology
- Journal of Reconstructive Microsurgery
- Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
- Leukemia : Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
- Leukemia : Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
- Annals of Plastic Surgery
- Nature Reviews. Drug Discovery
- Pharmazie in Unserer Zeit
- Antiviral Research
- Molecular Cancer Research : MCR
- The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society
- European Radiology
- Journal of Immunology (Baltimore, Md. : 1950)
- Journal of Medicinal Chemistry
- The Journal of General Physiology
- Psychiatria Hungarica : A Magyar PszichiÃ¡triai TÃ¡rsasÃ¡g TudomÃ¡nyos FolyÃ³irata
- Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
- International Journal of Rheumatic Diseases
- European Journal of Medicinal Chemistry
- Clinical Breast Cancer
- Science Translational Medicine
- Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
- Der Radiologe
- PloS One
- European Journal of Medicinal Chemistry
- Methods in Molecular Biology (Clifton, N.J.)
- Clinical Pharmacokinetics
- Toxicology Letters
- The Journal of Allergy and Clinical Immunology
- Journal of Immunology (Baltimore, Md. : 1950)
- Annals of the New York Academy of Sciences
- Academic Medicine : Journal of the Association of American Medical Colleges
- Carbon Balance and Management
- World Journal of Gastroenterology : WJG
- Journal of the American College of Cardiology
- The British Journal of Dermatology
- Der Radiologe
- Proceedings of the National Academy of Sciences of the United States of America
- PloS One
- BMC Surgery
- Deutsches Ã„rzteblatt International
- Carbon Balance and Management
- Der Radiologe
- Proceedings of the National Academy of Sciences of the United States of America
- Military Medicine
- Advances in Physiology Education
- The International Journal of Periodontics & Restorative Dentistry
- Current Chemical Genomics
- Carbon Balance and Management
- Handchirurgie, Mikrochirurgie, Plastische Chirurgie : Organ Der Deutschsprachigen Arbeitsgemeinschaft FÃ¼r Handchirurgie : Organ Der Deutschsprachigen Arbeitsgemeinschaft FÃ¼r Mikrochirurgie Der Peripheren Nerven Und GefÃ¤sse : Organ Der Vereinigung Der Deutschen Plastischen Chirurgen
- Pediatric Transplantation
- Leukemia & Lymphoma
- The Journal of Pediatrics
- Investigative Radiology
- The Journal of Endocrinology
- European Journal of Human Genetics : EJHG
- Veterinary Microbiology
- Colorectal Disease : the Official Journal of the Association of Coloproctology of Great Britain and Ireland
- Archives of Disease in Childhood
- Journal of Immunology (Baltimore, Md. : 1950)
- European Journal of Medicinal Chemistry
- Journal of Computational Chemistry
- Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
- Apoptosis : an International Journal on Programmed Cell Death
- Colorectal Disease : the Official Journal of the Association of Coloproctology of Great Britain and Ireland
- Veterinary and Comparative Oncology
- European Journal of Radiology
- Dento Maxillo Facial Radiology
- Clinical Therapeutics
- Journal of Plastic, Reconstructive & Aesthetic Surgery : JPRAS
- World Journal of Surgical Oncology
- Science Translational Medicine
- Genes & Development
- German Medical Science : GMS E-journal
- Mutation Research
- Plant Physiology
- Journal of Analytical Toxicology
- Experimental Cell Research
- Trends in Molecular Medicine
- Nature Methods
- Journal of Leukocyte Biology
- Der Radiologe
- Development (Cambridge, England)
- Academic Medicine : Journal of the Association of American Medical Colleges
- International Journal of Colorectal Disease
- Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine
- Human Heredity
- Langmuir : the ACS Journal of Surfaces and Colloids
- Deutsche Medizinische Wochenschrift (1946)
- Operative OrthopÃ¤die Und Traumatologie
- The Journal of Antimicrobial Chemotherapy
- Frontiers in Pharmacology
- Toxicology Letters
- International Journal of Cardiology
- PloS One
- The Journal of Investigative Dermatology
- Shock (Augusta, Ga.)
- The Journal of Antimicrobial Chemotherapy
- Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
- PloS One
- Journal of Immunology (Baltimore, Md. : 1950)
- Journal of Veterinary Emergency and Critical Care (San Antonio, Tex. : 2001)
- PloS One
- European Radiology
- The Journal of Biological Chemistry
- Transfusion Medicine and Hemotherapy : Offizielles Organ Der Deutschen Gesellschaft Fur Transfusionsmedizin Und Immunhamatologie
- BJU International
- Cold Spring Harbor Perspectives in Medicine
- PLoS Genetics
- Nature Immunology
- Der Unfallchirurg
- Chirurgia (Bucharest, Romania : 1990)
- Orvosi Hetilap
- Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [et Al.]
- Journal of Critical Care
- International Journal of Cardiology
- Sexually Transmitted Diseases
- PloS One
- Journal of Acquired Immune Deficiency Syndromes (1999)
- The Journal of Physiology
- American Journal of Obstetrics and Gynecology
- Arteriosclerosis, Thrombosis, and Vascular Biology
- Clinical Ophthalmology (Auckland, N.Z.)
- Wiener Medizinische Wochenschrift (1946)
- The British Journal of Dermatology
- American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
- Journal of Thoracic Imaging
- Academic Medicine : Journal of the Association of American Medical Colleges
- Plastic and Reconstructive Surgery
- PloS One
- The Journal of Infectious Diseases
- AIDS Research and Human Retroviruses
- PloS One
- BMC Bioinformatics
- Archives of Orthopaedic and Trauma Surgery
- German Medical Science : GMS E-journal
- The Journal of Clinical Investigation
- PloS One
- Journal of Pediatric Gastroenterology and Nutrition
- Der Radiologe
- The Journal of Clinical Endocrinology and Metabolism
- Sub-cellular Biochemistry
- Language and Speech
- Toxicology Letters
- American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons
- Der Chirurg; Zeitschrift FÃ¼r Alle Gebiete Der Operativen Medizen
- Expert Review of Clinical Pharmacology
- Journal of Neuropsychology
- Psychiatry Research
- American Journal of Reproductive Immunology (New York, N.Y. : 1989)
- PloS One
- Leukemia & Lymphoma
- Clinical Neurology and Neurosurgery
- Anticancer Research
- European Radiology
- Clinical and Translational Science
- German Medical Science : GMS E-journal
- Sensors (Basel, Switzerland)
- Methods (San Diego, Calif.)
- Journal of Reconstructive Microsurgery
- European Journal of Gastroenterology & Hepatology
- Journal of Virology
- Acta Anaesthesiologica Scandinavica
- Yonsei Medical Journal
- Klinische Padiatrie
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- Eukaryotic Cell
- Nature Chemical Biology
- Journal of Perinatal Medicine
- Aesthetic Plastic Surgery
- The Journal of Investigative Dermatology
Articles by Mona B. Herold in JoVE
Blastomere Explants to Test for Cell Fate Commitment During Embryonic Development
Paaqua A. Grant1, Mona B. Herold1, Sally A. Moody2
1Department of Biological Sciences, The George Washington University, 2Department of Anatomy and Regenerative Biology, The George Washington University
The fate of an individual embryonic cell can be influenced by inherited molecules and/or by signals from neighboring cells. Utilizing fate maps of the cleavage stage Xenopus embryo, single blastomeres can be identified for culture in isolation to assess the contributions of inherited molecules versus cell-cell interactions.
Published January 26, 2013. Keywords: Developmental Biology, Cellular Biology, Molecular Biology, Anatomy, Physiology, Biochemistry, Xenopus laevis, fate mapping, lineage tracing, cell-cell signaling, cell fate, blastomere, embryo, in situ hybridization, animal model
Other articles by Mona B. Herold on PubMed
Identification of a Novel Candidate Gene for Non-syndromic Autosomal Recessive Intellectual Disability: the WASH Complex Member SWIP
Human Molecular Genetics. Jul, 2011 | Pubmed ID: 21498477
High-throughput sequencing has greatly facilitated the elucidation of genetic disorders, but compared with X-linked and autosomal dominant diseases, the search for genetic defects underlying autosomal recessive diseases still lags behind. In a large consanguineous family with autosomal recessive intellectual disability (ARID), we have combined homozygosity mapping, targeted exon enrichment and high-throughput sequencing to identify the underlying gene defect. After appropriate single-nucleotide polymorphism filtering, only two molecular changes remained, including a non-synonymous sequence change in the SWIP [Strumpellin and WASH (Wiskott-Aldrich syndrome protein and scar homolog)-interacting protein] gene, a member of the recently discovered WASH complex, which is involved in actin polymerization and multiple endosomal transport processes. Based on high pathogenicity and evolutionary conservation scores as well as functional considerations, this gene defect was considered as causative for ID in this family. In line with this assumption, we could show that this mutation leads to significantly reduced SWIP levels and to destabilization of the entire WASH complex. Thus, our findings suggest that SWIP is a novel gene for ARID.
Expression Analysis of Genes Located in the Minimally Deleted Regions of 13q14 and 11q22-23 in Chronic Lymphocytic Leukemia-unexpected Expression Pattern of the RHO GTPase Activator ARHGAP20
Genes, Chromosomes & Cancer. Jul, 2011 | Pubmed ID: 21500311
In chronic lymphocytic leukemia (CLL), 13q14 and 11q22-23 deletions are found in 2/3 of the cases. 11q22-23 deletions are associated with poor survival, whereas 13q14 deletions as single abnormality are often found in indolent disease forms. The molecular basis for this difference in prognosis is not known. We examined the 13q14 and 11q22-23 minimally deleted regions (MDRs) for differentially expressed genes by analyzing 154 microarray CLL gene expression data sets. We were able to generate a detailed gene expression map of the MDRs demonstrating a gene dosage effect. Surprisingly, ARHGAP20 encoding the RHO GTPase activating protein 20, which is located in the 11q22-23 MDR, showed-counterintuitively-a significantly higher expression in cases with 11q22-23 deletions compared with cases with no detectable genetic lesion or trisomy 12. Interestingly, cases with 13q14 deletions also had higher ARHGAP20 expression. These expression level changes were confirmed by quantitative PCR in 110 additional CLL samples. The ARHGAP20 gene encodes an evolutionarily conserved protein. In the zebra fish (Danio rerio) genome the syntenic regions of human chromosomal bands 13q14 and 11q22-23 are juxtaposed. The similar expression profiles of ARHGAP20 in 13q14 and 11q22-23 deleted CLL cases suggest a molecular connection and an intriguing mechanism of regulation.
Nature Structural & Molecular Biology. May, 2011 | Pubmed ID: 21516096
In Escherichia coli, the pole-to-pole oscillation of the Min proteins directs septum formation to midcell, which is required for symmetric cell division. In vitro, protein waves emerge from the self-organization of MinD, a membrane-binding ATPase, and its activator MinE. For wave propagation, the proteins need to cycle through states of collective membrane binding and unbinding. Although MinD presumably undergoes cooperative membrane attachment, it is unclear how synchronous detachment is coordinated. We used confocal and single-molecule microscopy to elucidate the order of events during Min wave propagation. We propose that protein detachment at the rear of the wave, and the formation of the E-ring, are accomplished by two complementary processes: first, local accumulation of MinE due to rapid rebinding, leading to dynamic instability; and second, a structural change induced by membrane-interaction of MinE in an equimolar MinD-MinE (MinDE) complex, which supports the robustness of pattern formation.
Diabetes. May, 2011 | Pubmed ID: 21525508
NKG2A is a Marker for Acquisition of Regulatory Function by Human CD8+ T Cells Activated with Anti-CD3 Antibody
European Journal of Immunology. Jul, 2011 | Pubmed ID: 21538351
Treatment with anti-CD3 mAb modulates immune responses that cause type 1 diabetes and other diseases. CD8+ Tregs can be induced in vitro and in vivo by mAb. However, 1/3 of patients do not respond to drug therapy and in an equal proportion, anti-CD3 mAb does not induce Tregs in vitro. The acquisition of CD8+ Treg activity is a function of the CD8+ cells and not the targets in the assay. To identify markers to differentiate responses of CD8+ Tregs, we analyzed genes differentially expressed in CD8+ T cells of non-responders compared with responders, and found that an inhibitory receptor NKG2A (CD159a) was highly expressed in cells from all non-responders tested. Application of a mAb agonistic to NKG2A during in vitro CD8+ Treg induction by anti-CD3 prevented induction of CD8+ Tregs. CD8+ T cells that are TNFR2+ but NKG2A- are the most potently induced Tregs. The level of NKG2A expression on resting CD8+ T cells inversely correlated with acquisition of regulatory function when activated. We suggest that the induction of human CD8+ Tregs by anti-CD3 mAb is controlled by a negative signaling through NKG2A, and that NKG2A may serve as a negative marker of human CD8+ Tregs.
On "Perioperative Antibiotics in the Setting of Microvascular Free Tissue Transfer: Current Practices" (J Reconstr Microsurg 2010;26(6):401-407)
Journal of Reconstructive Microsurgery. Jun, 2011 | Pubmed ID: 21594806
Angiographic Findings in Patients with Postoperative Soft Tissue Defects Following Total Knee Arthroplasty
Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA. Dec, 2011 | Pubmed ID: 21611782
A postoperative defect of the surrounding soft tissue is one main risk factor for implant exposure and infection following total knee arthroplasty (TKR). The main factors that promote infection, tissue ischemia, and hypoxia are strongly associated with arterial insufficiency and the prevalence of impaired peripheral perfusion. We hypothesized that vascular malperfusion is the predisposing reason for soft tissue complications following TKR necessitating plastic reconstructive surgery.
An Eight-gene Expression Signature for the Prediction of Survival and Time to Treatment in Chronic Lymphocytic Leukemia
Leukemia : Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K. Oct, 2011 | Pubmed ID: 21625232
Genomic 5-hydroxymethylcytosine Levels Correlate with TET2 Mutations and a Distinct Global Gene Expression Pattern in Secondary Acute Myeloid Leukemia
Leukemia : Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K. Oct, 2011 | Pubmed ID: 21625234
Evaluation of Prophylactic Anticoagulation, Deep Venous Thrombosis, and Heparin-induced Thrombocytopenia in 21 Burn Centers in Germany, Austria, and Switzerland
Annals of Plastic Surgery. Jul, 2011 | Pubmed ID: 21629067
Heparin-induced thrombocytopenia (HIT) is a life-threatening complication in intensive care settings. The timely diagnosis and management of HIT are challenging, and the incidences of HIT and deep venous thrombosis (DVT) may be related to prophylactic anticoagulation standards in burn units. We therefore evaluated, using a questionnaire, prophylactic anticoagulation, HIT management, and incidences of DVT and HIT in burn centers located in the German-speaking part of Europe. In the 21 responding burn centers, 1611 patients were treated and the overall incidences for clinically overt DVT and HIT in 2008 were 1.1% and 1.4%, respectively. Burn centers using low molecular weight heparin (LMWH) subcutaneous for all patients had a low rate of DVT (0.9%) and significantly lower rates of HIT (0.2%) relative to all other centers (P < 0.05). The highest rates of HIT (2.7%) and DVT (3.8%) were found in burn centers administering unfractionated heparin intravenous. While current HIT guidelines do not specify the administration of unfractionated heparin or LMWH for burn patients, these data warrant controlled prospective studies to confirm the advantage of LMWH administration in burn patients.
Nature Reviews. Drug Discovery. Jun, 2011 | Pubmed ID: 21629294
Type 1 diabetes is a common, severe chronic autoimmune disease that is characterized by the progressive and insidious loss of self-tolerance to the insulin-producing pancreatic islet Î²-cells. This loss of self-tolerance leads to the destruction of Î²-cells and the development of overt hyperglycaemia at diagnosis. The incidence and prevalence of type 1 diabetes is rapidly increasing worldwide, and this has led to intensive efforts to develop immunotherapies to induce remission of the disease and improve clinical outcomes. Immunotherapy aims to restore self-tolerance, resulting in the downregulation of autoimmune responses to pancreatic self-antigens and arrested ongoing Î²-cell destruction. When combined with replacement of the lost insulin-producing cells, this may lead to the restoration of euglycaemia. In this review, we discuss the current knowledge of the immunopathogenesis of type 1 diabetes and how this information has been translated into clinical trials. We also discuss next-generation combination immunotherapies that may be administered as adjuvant therapy at time of diagnosis.
Pharmazie in Unserer Zeit. Mar, 2011 | Pubmed ID: 21630536
Inhibition of Influenza Virus-induced NF-kappaB and Raf/MEK/ERK Activation Can Reduce Both Virus Titers and Cytokine Expression Simultaneously in Vitro and in Vivo
Antiviral Research. Oct, 2011 | Pubmed ID: 21641936
Influenza virus (IV) infection can cause severe pneumonia and death. Therapeutic actions are limited to vaccines and a few anti-viral drugs. These target viral functions thereby selecting resistant variants. During replication IV activates the Raf/MEK/ERK-cascade and the transcription factor NF-kappaB. Both result in virus supportive and anti-viral effects by promoting viral genome transport for virus assembly and by inducing expression of pro-inflammatory host factors. Apart from tissue damage caused by the virus lytic replication, an imbalanced overproduction of anti-viral cytokines can cause severe lung damage as observed in human H5-type IV infections. Recently we showed that inhibition of NF-kappaB activity reduces the virus titer in vitro and in vivo. We have now analyzed whether inhibition of these pathways, allows simultaneous reduction of virus titers and virus-induced cytokines. The results show that inhibition of either pathway indeed leads to decreased virus titers and cytokine expression. This was not only true for infected permanent cells or primary mouse alveolar epithelial cells, but also in infected mice. Hereby we demonstrate for the first time in vitro and in vivo that virus titers and pro-inflammatory cytokine expression can be modulated simultaneously. This could provide a new rationale of future therapeutic strategies to treat IV pneumonia.
Circulating Tumor Cells from Patients with Advanced Prostate and Breast Cancer Display Both Epithelial and Mesenchymal Markers
Molecular Cancer Research : MCR. Aug, 2011 | Pubmed ID: 21665936
During cancer progression, malignant cells undergo epithelial-mesenchymal transitions (EMT) and mesenchymal-epithelial transitions (MET) as part of a broad invasion and metastasis program. We previously observed MET events among lung metastases in a preclinical model of prostate adenocarcinoma that suggested a relationship between epithelial plasticity and metastatic spread. We thus sought to translate these findings into clinical evidence by examining the existence of EMT in circulating tumor cells (CTC) from patients with progressive metastatic solid tumors, with a focus on men with castration-resistant prostate cancer (CRPC) and women with metastatic breast cancer. We showed that the majority (> 80%) of these CTCs in patients with metastatic CRPC coexpress epithelial proteins such as epithelial cell adhesion molecule (EpCAM), cytokeratins (CK), and E-cadherin, with mesenchymal proteins including vimentin, N-cadherin and O-cadherin, and the stem cell marker CD133. Equally, we found that more than 75% of CTCs from women with metastatic breast cancer coexpress CK, vimentin, and N-cadherin. The existence and high frequency of these CTCs coexpressing epithelial, mesenchymal, and stem cell markers in patients with progressive metastases has important implications for the application and interpretation of approved methods to detect CTCs.
Generation of Mature Murine Monocytes from Heterogeneous Bone Marrow and Description of Their Properties
The Journal of Histochemistry and Cytochemistry : Official Journal of the Histochemistry Society. Sep, 2011 | Pubmed ID: 21705645
Monocytes are involved in a wide range of physiological and pathological processes, many of which are studied in mouse models. Current protocols to isolate murine monocytes are few and result in unsatisfactory cell yield and purity. Here, we describe a novel approach to efficiently differentiate large numbers of mature inflammatory monocytes from heterogeneous bone marrow cell suspensions. Bone marrow cell suspensions were isolated by flushing femurs and tibias from Balb/c and C57Bl/6 mice, supplemented with macrophage colony-stimulating factor (M-CSF), and were cultured on ultra-low attachment surfaces to inhibit adherence-mediated maturation. Cells were harvested at indicated time points, underwent time-line analysis of the differentiation processes, and were subsequently extensively phenotyped to verify their monocytotic properties. In order to confirm downstream compatibility, we tested for typical monocyte behavior. Our protocol yielded 24 Â± 6 Ã— 10(6) differentiated cells per donor mouse, 10-fold higher than yields obtained using previously described peripheral blood isolation methods. Differentiated cells consisted of approximately 47% Â± 12% monocytes, the rest being mature macrophages. We increased monocyte purity to 86% Â± 6% by depleting adherent macrophages. Our findings indicate that bone marrow-derived monocytes (BMDMs) are an attractive tool to study, for example, the innate and adaptive immune system, atherosclerosis, and cellular migration during infection. Moreover, BMDM transplantation could be used to test novel, therapeutic in vivo approaches in mice disease models.
Accuracy of Hydro-multidetector Row CT in the Local T Staging of Oesophageal Cancer Compared to Postoperative Histopathological Results
European Radiology. Nov, 2011 | Pubmed ID: 21710266
To evaluate the accuracy of multidetector computed tomography with water filling (Hydro-MDCT) in the T-staging of patients with oesophageal cancer.
Antigen-based Therapy with Glutamic Acid Decarboxylase (GAD) Vaccine in Patients with Recent-onset Type 1 Diabetes: a Randomised Double-blind Trial
Lancet. Jul, 2011 | Pubmed ID: 21714999
Glutamic acid decarboxylase (GAD) is a major target of the autoimmune response that occurs in type 1 diabetes mellitus. In animal models of autoimmunity, treatment with a target antigen can modulate aggressive autoimmunity. We aimed to assess whether immunisation with GAD formulated with aluminum hydroxide (GAD-alum) would preserve insulin production in recent-onset type 1 diabetes.
Teplizumab for Treatment of Type 1 Diabetes (ProtÃ©gÃ© Study): 1-year Results from a Randomised, Placebo-controlled Trial
Lancet. Aug, 2011 | Pubmed ID: 21719095
Findings of small studies have suggested that short treatments with anti-CD3 monoclonal antibodies that are mutated to reduce Fc receptor binding preserve Î²-cell function and decrease insulin needs in patients with recent-onset type 1 diabetes. In this phase 3 trial, we assessed the safety and efficacy of one such antibody, teplizumab.
Interlaboratory Reproducibility of Female Genital Tract Cytokine Measurements by Luminex: Implications for Microbicide Safety Studies
Cytokine. Nov, 2011 | Pubmed ID: 21764598
The interlaboratory reproducibility of cytokine measurements from cervicovaginal samples by Luminex has not been reported. Using cervicovaginal lavage specimens collected on three study days from 12 women participating in a Phase I microbicide study, we measured a panel of eight cytokines in three independent laboratories. Four (IFN-Î³, IL-10, IL-17, and TNF) were below the limit of detection in the majority (85%) of samples in either two or all three laboratories, an observation that may guide analyte selection for future studies. Good interlaboratory agreement (intraclass correlation coefficient, r>0.7) in absolute levels was observed for IL-1Î², IL-6, and IL-8, while poor agreement was seen for IFN-Î±2 (r=0.47). When considering within-subject change from baseline (pre-product, at study-day 0) to either post-product visit (study-days 7 and 14), IL-1Î² and IL-6 exhibited good interlaboratory agreement (r>0.7), while IFN-Î±2 and IL-8 did not. Future studies addressing the clinical utility of specific biomarkers of inflammation for microbicide trials should consider reproducibility in the context of defining biologically meaningful thresholds of change for candidate biomarkers, ensuring that such change can be reliably distinguished from background variability.
Nature. Jul, 2011 | Pubmed ID: 21765430
Interleukin (IL)-17-producing T helper cells (T(H)17) are a recently identified CD4(+) T cell subset distinct from T helper type 1 (T(H)1) and T helper type 2 (T(H)2) cells. T(H)17 cells can drive antigen-specific autoimmune diseases and are considered the main population of pathogenic T cells driving experimental autoimmune encephalomyelitis (EAE), the mouse model for multiple sclerosis. The factors that are needed for the generation of T(H)17 cells have been well characterized. However, where and how the immune system controls T(H)17 cells in vivo remains unclear. Here, by using a model of tolerance induced by CD3-specific antibody, a model of sepsis and influenza A viral infection (H1N1), we show that pro-inflammatory T(H)17 cells can be redirected to and controlled in the small intestine. T(H)17-specific IL-17A secretion induced expression of the chemokine CCL20 in the small intestine, facilitating the migration of these cells specifically to the small intestine via the CCR6/CCL20 axis. Moreover, we found that T(H)17 cells are controlled by two different mechanisms in the small intestine: first, they are eliminated via the intestinal lumen; second, pro-inflammatory T(H)17 cells simultaneously acquire a regulatory phenotype with in vitro and in vivo immune-suppressive properties (rT(H)17). These results identify mechanisms limiting T(H)17 cell pathogenicity and implicate the gastrointestinal tract as a site for control of T(H)17 cells.
Increased T Cell Proliferative Responses to Islet Antigens Identify Clinical Responders to Anti-CD20 Monoclonal Antibody (rituximab) Therapy in Type 1 Diabetes
Journal of Immunology (Baltimore, Md. : 1950). Aug, 2011 | Pubmed ID: 21775681
Type 1 diabetes mellitus is believed to be due to the autoimmune destruction of Î²-cells by T lymphocytes, but a single course of rituximab, a monoclonal anti-CD20 B lymphocyte Ab, can attenuate C-peptide loss over the first year of disease. The effects of B cell depletion on disease-associated T cell responses have not been studied. We compare changes in lymphocyte subsets, T cell proliferative responses to disease-associated target Ags, and C-peptide levels of participants who did (responders) or did not (nonresponders) show signs of Î²-cell preservation 1 y after rituximab therapy in a placebo-controlled TrialNet trial. Rituximab decreased B lymphocyte levels after four weekly doses of mAb. T cell proliferative responses to diabetes-associated Ags were present at baseline in 75% of anti-CD20- and 82% of placebo-treated subjects and were not different over time. However, in rituximab-treated subjects with significant C-peptide preservation at 6 mo (58%), the proliferative responses to diabetes-associated total (p = 0.032), islet-specific (p = 0.048), and neuronal autoantigens (p = 0.005) increased over the 12-mo observation period. This relationship was not seen in placebo-treated patients. We conclude that in patients with type 1 diabetes mellitus, anti-B cell mAb causes increased proliferative responses to diabetes Ags and attenuated Î²-cell loss. The way in which these responses affect the disease course remains unknown.
Journal of Medicinal Chemistry. Sep, 2011 | Pubmed ID: 21780790
Protein lysine methyltransferase G9a plays key roles in the transcriptional repression of a variety of genes via dimethylation of lysine 9 on histone H3 (H3K9me2) of chromatin as well as dimethylation of nonhistone proteins including tumor suppressor p53. We previously reported the discovery of UNC0321 (3), the most potent G9a inhibitor to date, via structure-based design and structure-activity relationship (SAR) exploration of the quinazoline scaffold represented by BIX01294 (1). Despite its very high in vitro potency, compound 3 lacks sufficient cellular potency. The design and synthesis of several generations of new analogues aimed at improving cell membrane permeability while maintaining high in vitro potency resulted in the discovery of a number of novel G9a inhibitors such as UNC0646 (6) and UNC0631 (7) with excellent potency in a variety of cell lines and excellent separation of functional potency versus cell toxicity. The design, synthesis, and cellular SAR of these potent G9a inhibitors are described.
Thiazolidinedione Insulin Sensitizers Alter Lipid Bilayer Properties and Voltage-dependent Sodium Channel Function: Implications for Drug Discovery
The Journal of General Physiology. Aug, 2011 | Pubmed ID: 21788612
The thiazolidinediones (TZDs) are used in the treatment of diabetes mellitus type 2. Their canonical effects are mediated by activation of the peroxisome proliferator-activated receptor Î³ (PPARÎ³) transcription factor. In addition to effects mediated by gene activation, the TZDs cause acute, transcription-independent changes in various membrane transport processes, including glucose transport, and they alter the function of a diverse group of membrane proteins, including ion channels. The basis for these off-target effects is unknown, but the TZDs are hydrophobic/amphiphilic and adsorb to the bilayer-water interface, which will alter bilayer properties, meaning that the TZDs may alter membrane protein function by bilayer-mediated mechanisms. We therefore explored whether the TZDs alter lipid bilayer properties sufficiently to be sensed by bilayer-spanning proteins, using gramicidin A (gA) channels as probes. The TZDs altered bilayer elastic properties with potencies that did not correlate with their affinity for PPARÎ³. At concentrations where they altered gA channel function, they also altered the function of voltage-dependent sodium channels, producing a prepulse-dependent current inhibition and hyperpolarizing shift in the steady-state inactivation curve. The shifts in the inactivation curve produced by the TZDs and other amphiphiles can be superimposed by plotting them as a function of the changes in gA channel lifetimes. The TZDs' partition coefficients into lipid bilayers were measured using isothermal titration calorimetry. The most potent bilayer modifier, troglitazone, alters bilayer properties at clinically relevant free concentrations; the least potent bilayer modifiers, pioglitazone and rosiglitazone, do not. Unlike other TZDs tested, ciglitazone behaves like a hydrophobic anion and alters the gA monomer-dimer equilibrium by more than one mechanism. Our results provide a possible mechanism for some off-target effects of an important group of drugs, and underscore the importance of exploring bilayer effects of candidate drugs early in drug development.
Theory of Mind Deficits in Euthymic Patients with Bipolar I Disorder. Theoretical Background and Guidelines for Neuroimaging Research
Psychiatria Hungarica : A Magyar PszichiÃ¡triai TÃ¡rsasÃ¡g TudomÃ¡nyos FolyÃ³irata. 2011 | Pubmed ID: 21799220
In this paper, we review the literature about the theory of mind (ToM) deficits in patients with bipolar disorder. According to several studies, bipolar patients have remarkable ToM deficits not only in manic and depressive periods, but even in remission. However, results on the association with the symptom severity and basic neurocognitive (especially executive) functions are controversial. Taken together, ToM deficits seem to be state dependent trait markers of the bipolar disorder. Some authors suggest that ToM deficits can influence the functional outcome. Therefore, the better understanding of ToM deficits in bipolar disorder is of particular importance. In the second part of the paper we review the methodological issues, and provide a possible guideline for the study of ToM in bipolar disorders. Illness specific considerations of the neuroimaging research, the ToM task used in the experiment, the experimental design, and the data analysis are particularly emphasized.
Phase II Trial of Dasatinib in Patients with Metastatic Breast Cancer Using Real-time Pharmacodynamic Tissue Biomarkers of Src Inhibition to Escalate Dosing
Clinical Cancer Research : an Official Journal of the American Association for Cancer Research. Sep, 2011 | Pubmed ID: 21810917
A phase II study of dasatinib, an inhibitor of multiple oncogenic tyrosine kinases including Src, was conducted to evaluate 16-week progression-free rate and tolerability in patients with previously treated metastatic breast cancer (MBC). Real-time assessment of potential tissue biomarkers of Src inhibition was used to optimize dosing.
Investigation of Bacterial and Viral Agents and Immune Status in Behcet's Disease Patients from Iran
International Journal of Rheumatic Diseases. Aug, 2011 | Pubmed ID: 21816027
BehÃ§et's disease (BD) is an autoimmune disorder associated with HLA-B51 positivity. Serologic/genomic findings have suggested microbes as possible causative agents and the geographical distribution suggests environmental influences.
Synthesis and Biological Investigation of Potential Atypical Antipsychotics with a Tropane Core. Part 1
European Journal of Medicinal Chemistry. Sep, 2011 | Pubmed ID: 21816515
The synthesis, structure, in vitro and in vivo pharmacological activities of 3Î²-acylamine derivatives of tropane (4a-n, 5a-g, 6a,b, 8a-c) are described. Among the investigated compounds, several displayed very high (in nM) affinity for the monoamine receptors 5-HT(1A), 5-HT(2A,) and D(2). The most interesting agent 6b revealed very high affinity for the 5-HT(2A) and D(2) receptors and high affinity for the 5-HT(1A) receptor. The in vivo head twitch model was used to demonstrate antagonism of the 5-HT(2A) receptor subtype by this compound. In another test, 6b caused hypothermia in mice, which was not attenuated by WAY 100635. In the climbing test, the compound did not significantly modify climbing behaviour following apomorphine administration. Moreover, 6b significantly reduced locomotor activity in mice. Molecular docking studies using a homology model of the 5-HT(1A) receptor revealed a significant role of the N-8 atom of the tropane core in stabilising the ligand-receptor complex due to strong hydrogen bonding with Asp116 located in the TMH 3 helix. Analogically, in a homology model of the 5-HT(2A) receptor, the N-8 atom formed a hydrogen bond with Gly369. In another homology model of the D(2) receptor, strong hydrogen bonding of the amide moiety in the 3Î² position of the tropane nucleus with Asp85 was observed. Compound 6b displayed a favourable Meltzer index (1.21) which is a feature of atypical antipsychotic agents.
Second Primary Ipsilateral Breast Cancer with Contralateral Axillary Involvement: a Case Report and Literature Review
Clinical Breast Cancer. Dec, 2011 | Pubmed ID: 21820972
After breast-conserving surgery for an initial breast cancer, the incidence of lymphatic drainage to sites other than the ipsilateral axilla, such as the contralateral axilla, increases significantly at the time of a second primary ipsilateral breast cancer. Given the likelihood of altered lymphatic drainage, and in the absence of distant metastatic sites, consideration should be given to treating patients with a second primary ipsilateral breast cancer and contralateral axillary lymph node involvement with curative intent. This clinical issue may become more common as the incidence of second primary ipsilateral breast cancer would be expected to increase due to widespread adoption of breast-conserving surgery, improved prognosis for patients with an initial early-stage breast cancer, and highly sensitive screening modalities such as magnetic resonance imaging.
Diabetes. Oct, 2011 | Pubmed ID: 21831969
The TrialNet Study Group evaluated rituximab, a B-cell-depleting monoclonal antibody, for its effect in new-onset patients with type 1A diabetes. Rituximab decreased the loss of C-peptide over the first year of follow-up and markedly depleted B lymphocytes for 6 months after administration. This article analyzes the specific effect of rituximab on multiple islet autoantibodies.
Science Translational Medicine. Aug, 2011 | Pubmed ID: 21832236
Reevaluation of clinical data from the recent failed immunotherapy trials suggests that researchers should continue the quest to cure type 1 diabetes with immune therapies.
The European Medicines Agency: an Overview of Its Mission, Responsibilities, and Recent Initiatives in Cancer Drug Regulation
Clinical Cancer Research : an Official Journal of the American Association for Cancer Research. Aug, 2011 | Pubmed ID: 21844037
The European Medicines Agency (EMA) is responsible for the scientific evaluation of medicines developed by pharmaceutical companies for use in the European Union (EU). Since 2005, the agency has become responsible for the approval of all new oncology drugs in the EU. In this article we describe the mission, role, and responsibilities of the EMA, and provide a brief summary of recent initiatives related to cancer drug regulation. The EMA recently published its Road Map to 2015. Over the next 5 years, the agency aims to continue to stimulate drug development in areas of unmet medical needs. Concerning drug safety, one of the priorities over the next few years will be to establish a more proactive approach in ensuring patient safety. This is the result of new EU legislation coming into force in 2012 that will strengthen the way the safety of medicines for human use is monitored in the EU. In terms of its general operation, the agency is committed to increased openness and transparency, and to build on its interactions with stakeholders, including members of academia, health care professionals, patients, and health technology assessment bodies. The agency recently created an oncology working party to expand the current guideline for the development and evaluation of cancer drugs. The guideline focuses on both exploratory and confirmatory studies for different types of agents. The current revision will address a number of topics, including the use of biomarkers as an integrated part of drug development and the use of progression-free survival as a primary endpoint in registration trials.
PloS One. 2011 | Pubmed ID: 21858008
Synthesis and Anticonvulsant Activity of Novel 2,6-diketopiperazine Derivatives. Part 1: Perhydropyrrole[1,2-a]pyrazines
European Journal of Medicinal Chemistry. Oct, 2011 | Pubmed ID: 21862182
A number of novel pyrrole[1,2-a]pyrazine derivatives were synthesized and evaluated in in vivo animal models of epilepsy. Among them, several compounds displayed promising seizure protection in the maximal electroshock seizure (MES), subcutaneous metrazol seizure (scMET), 6 Hz and pilocarpine-induced status prevention (PISP) tests, with ED(50) values comparable to the reference anticonvulsant drugs (AEDs). A critical influence of the stereochemistry and conformational preferences of the pyrrole[1,2-a]pyrazine core on in vivo pharmacological activity was observed. The mechanism of the anticonvulsant action of the agents synthesized is most probably not via inhibition of the voltage-dependent sodium (Na(+)) currents.
Methods in Molecular Biology (Clifton, N.J.). 2011 | Pubmed ID: 21874490
Comprehensive imaging of the cardiovascular system of murine models of atherosclerosis requires high spatial and temporal resolution as well as a high soft tissue contrast. High-field (â‰¥7 T) experimental magnetic resonance imaging can provide noninvasive, high-resolution images of the murine cardiovascular system. High-field scanners, however, require special equipment and imaging protocols. The aim of this chapter is to provide instructions on how to obtain morphological and functional data on the murine cardiovascular system in animal models of atherosclerotic disease on a very high-field scanner (17.6 T). Equipment requirements are presented, and a comprehensive description of the methods needed to complete a magnetic resonance imaging exam, including the animal preparation, imaging, and image analysis are discussed. In addition, common problems during high-field MRI experiments and methods to validate MRI results are reviewed. The steps can be adopted to other MRI scanners and modification of the imaging parameters might allow for a more individual assessment of cardiovascular diseases in a number of transgenic mouse models.
Inhibition of the Transport of HIV InÂ vitro Using a PH-responsive Synthetic Mucin-like Polymer System
Biomaterials. Nov, 2011 | Pubmed ID: 21875751
In conjunction with the routine role of delivering the active ingredient, carefully designed drug delivery vehicles can also provide ancillary functions that augment the overall efficacy of the system. Inspired by the ability of the cervicovaginal mucus to impede the movement of HIV virions at acidic pH, we have engineered a pH-responsive synthetic polymer that shows improved barrier properties over the naturally occurring cervicovaginal mucus by inhibiting viral transport at both acidic and neutral pH. The pH-responsive synthetic mucin-like polymer is constructed with phenylboronic acid (PBA) and salicylhydroxamic acid (SHA), each individually copolymerized with a 2-hydroxypropyl methacrylamide (pHPMA) polymer backbone. At pH 4.8, the crosslinked polymers form a transient network with a characteristic relaxation time of 0.9 s and elastic modulus of 11 Pa. On addition of semen, the polymers form a densely crosslinked elastic network with a characteristic relaxation time greater than 60 s and elastic modulus of 1800 Pa. Interactions between the PBA-SHA crosslinked polymers and mucin at acidic pH showed a significant increase in elastic modulus and crosslink lifetime (p < 0.05). A transport assay revealed that migration of HIV and cells was significantly impeded by the polymer network at pH â‰¥ 4.8 with a diffusion coefficient of 1.60 x 10(-4) Î¼m(2)/s for HIV. Additionally, these crosslinked polymers did not induce symptoms of toxicity or irritation in either human vaginal explants or a mouse model. In summary, the pH-responsive crosslinked polymer system reported here holds promise as a class of microbicide delivery vehicle that could inhibit the transport of virions from semen to the target tissue and, thereby, contribute to the overall activity of the microbicide formulation.
Cytokine. Nov, 2011 | Pubmed ID: 21880503
Tuberculosis (TB) is the worldwide leading cause of death among HIV-infected individuals, accounting for more than half of AIDS-related deaths. A high risk of tuberculosis (TB) has been shown in early stages of the HIV disease, even in the presence of normal CD4(+) cell counts. Moreover, the factors that determine protective immunity vs. susceptibility to Mycobacterium tuberculosis cannot be fully explained by simple changes in IFNÎ³ levels or a shift from Th1 to Th2 cytokines. This work investigated the relationship between cytokine expression profiles in peripheral blood mononuclear cells (PBMC) and susceptibility to M. tuberculosis in 10 HIV+ women who went onto develop TB. RNA transcripts for IL-4, IL-4Î´2, IL-10, IL-12(p35), IL-13, IL-17A, IFNÎ³ and TNFÎ± were measured by real-time quantitative PCR in unstimulated or TB peptide antigen-stimulated PBMCs from 10 HIV+ women with positive tuberculin skin tests (TST) and compared with HIV-seropositive and seronegative women without previous TB and negative TST. Stimulated PBMC cultures showed significantly lower expression of IL-12p35 (p=0.004) and IL-10 (p=0.026) in the HIV+TB+ group 6-12months before onset of TB compared to HIV+TB- women. Unstimulated PBMC from HIV+TB+ women also had lower expression of Th2 cytokines [IL-4 (p=0.056) and IL-13 (p=0.050)] compared to HIV+TB- women. These results suggest that lower IL-12 production by PBMC in response to TB antigens and lower levels of both Th1 and Th2 cytokines by PBMC correlate with future development of TB in HIV-infected women and may be responsible for their increased susceptibility.
Clinical Pharmacokinetics. Oct, 2011 | Pubmed ID: 21895035
Toxicology Letters. Nov, 2011 | Pubmed ID: 21907771
Metabolite profiling (metabolomics) elucidates changes in biochemical pathways under various conditions, e.g., different nutrition scenarios or compound administration. BASF and metanomics have obtained plasma metabolic profiles of approximately 500 compounds (agrochemicals, chemicals and pharmaceuticals) from 28-day rat studies. With these profiles the establishment of a database (MetaMap(Â®)Tox) containing specific metabolic patterns associated with many toxicological modes of action was achieved. To evaluate confounding factors influencing metabolome patterns, the effect of fasting vs. non-fasting prior to blood sampling, the influence of high caloric diet and caloric restriction as well as the administration of corn oil and olive oil was studied for its influence on the metabolome. All mentioned treatments had distinct effects: triacylglycerol, phospholipids and their degradation product levels (fatty acids, glycerol, lysophosphatidylcholine) were often altered depending on the nutritional status. Also some amino acid and related compounds were changed. Some metabolites derived from food (e.g. alpha-tocopherol, ascorbic acid, beta-sitosterol, campesterol) were biomarkers related to food consumption, whereas others indicated a changed energy metabolism (e.g. hydroxybutyrate, pyruvate). Strikingly, there was a profound difference in the metabolite responses to diet restriction in male and female rats. Consequently, when evaluating the metabolic profile of a compound, the effect of nutritional status should be taken into account.
The Journal of Allergy and Clinical Immunology. Dec, 2011 | Pubmed ID: 21908031
B-lymphocyte depletion with rituximab has been shown to benefit patients with various autoimmune diseases. We have previously demonstrated that this benefit is also apparent in patients with newly diagnosed type 1 diabetes.
Psycho-oncology. Sep, 2011 | Pubmed ID: 21915940
Some individuals are able to gain psychological benefits from illness and adversity, such as a greater sense of purpose and closer relationships, termed 'benefit finding' (BF). The main aim of this study was to explore the extent to which BF is reported in patients with head and neck cancer (HNC). Secondary aims were to establish the relationships between BF, other patient-reported outcomes and predictive factors such as coping strategy and level of optimism.
Acid Sphingomyelinase is Required for Protection of Effector Memory T Cells Against Glucocorticoid-induced Cell Death
Journal of Immunology (Baltimore, Md. : 1950). Nov, 2011 | Pubmed ID: 21948986
The activity of acid sphingomyelinase (aSMase) was previously reported to be involved in glucocorticoid-induced cell death (GICD) of T lymphocytes. This mechanism in turn is believed to contribute to the therapeutic efficacy of glucocorticoids (GCs) in the treatment of inflammatory diseases. In this study, we reassessed the role of aSMase in GICD by using aSMase knockout mice. The absence of aSMase largely abolished the partial protection that effector memory CD4(+) T cells in wild-type mice possess against GICD. Reduced IL-2 secretion by aSMase-deficient CD4(+) T cells suggested that a lack of this important survival factor might be the cause of these cells' enhanced susceptibility to GICD. Indeed, addition of IL-2 restored the protection against GICD, whereas neutralization of IL-2 abrogated the otherwise protective effect seen in wild-type effector memory CD4(+) T cells. The therapeutic implications of the altered sensitivity of aSMase-deficient T cells to GICD were assessed in models of inflammatory disorders; namely, experimental autoimmune encephalomyelitis and acute graft-versus-host disease. Surprisingly, GC treatment was equally efficient in both models in terms of ameliorating the diseases, regardless of the genotype of the T cells. Thus, our data reveal a hitherto unrecognized contribution of aSMase to the sensitivity of effector memory CD4(+) T cells to GICD and call into question the traditionally attributed importance of GICD of T cells to the treatment of inflammatory diseases by GCs.
Annals of the New York Academy of Sciences. Sep, 2011 | Pubmed ID: 21950990
Externally guided sensory-motor processes deteriorate with increasing age. Internally guided, for example, predictive, behavior usually helps to overcome sensory-motor delays. We studied whether predictive components of visuomotor transformation decline with age. We investigated smooth pursuit eye movements (SPEM) of 45 healthy subjects with paradigms of different degrees of predictability with respect to target motion onset, type (smoothed triangular, ramp stimulation), and direction by blanking the target at various intervals of the ramp stimulation. Using repetitive trials of SPEM stimulation, we could dissociate anticipatory and predictive components of extraretinal smooth pursuit behavior. The main results suggest that basic motor parameters decline with increasing age, whereas both anticipation and prediction of target motion did not change with age. We suggest that the elderly maintain their capability of using prediction in the immediate control of motor behavior, which might be a way to compensate for age-related delays in sensory-motor transformation, even in the absence of sensory signals.
Academic Medicine : Journal of the Association of American Medical Colleges. Oct, 2011 | Pubmed ID: 21955775
Despite the goal of objective structured clinical examinations (OSCEs) to be objective, examiner biases may influence scores. Examiner familiarity with candidates is a potential bias that has not been well studied.
Carbon Balance and Management. 2011 | Pubmed ID: 21982054
Assessing biomass is gaining increasing interest mainly for bioenergy, climate change research and mitigation activities, such as reducing emissions from deforestation and forest degradation and the role of conservation, sustainable management of forests and enhancement of forest carbon stocks in developing countries (REDD+). In response to these needs, a number of biomass/carbon maps have been recently produced using different approaches but the lack of comparable reference data limits their proper validation. The objectives of this study are to compare the available maps for Uganda and to understand the sources of variability in the estimation. Uganda was chosen as a case-study because it presents a reliable national biomass reference dataset.
World Journal of Gastroenterology : WJG. Aug, 2011 | Pubmed ID: 21987609
To evaluate the antitumoral effect of combined inhibitors of angiogenesis and histone deacetylases in an experimental rat hepatoma model.
Effects of Donor Pre-treatment with Dopamine on Survival After Heart Transplantation: a Cohort Study of Heart Transplant Recipients Nested in a Randomized Controlled Multicenter Trial
Journal of the American College of Cardiology. Oct, 2011 | Pubmed ID: 21996389
We determined the outcome of cardiac allografts from multiorgan donors enrolled in a randomized trial of donor pre-treatment with dopamine.
Susceptibility Variants on Chromosome 7p21.1 Suggest HDAC9 As a New Candidate Gene for Male-pattern Baldness
The British Journal of Dermatology. Dec, 2011 | Pubmed ID: 22032556
Male-pattern baldness (androgenetic alopecia, AGA) is the most common form of hair loss among humans. Research has shown that it is caused by genetic factors. Numerous studies have unequivocally identified two major genetic risk loci for AGA: the X-chromosomal AR/EDA2R locus, and the PAX1/FOXA2 locus on chromosome 20.
Proceedings of the National Academy of Sciences of the United States of America. Nov, 2011 | Pubmed ID: 22074781
In diabetes mellitus, Î² cell destruction is largely silent and can be detected only after significant loss of insulin secretion capacity. We have developed a method for detecting Î² cell death in vivo by amplifying and measuring the proportion of insulin 1 DNA from Î² cells in the serum. By using primers that are specific for DNA methylation patterns in Î² cells, we have detected circulating copies of Î² cell-derived demethylated DNA in serum of mice by quantitative PCR. Accordingly, we have identified a relative increase of Î² cell-derived DNA after induction of diabetes with streptozotocin and during development of diabetes in nonobese diabetic mice. We have extended the use of this assay to measure Î² cell-derived insulin DNA in human tissues and serum. We found increased levels of demethylated insulin DNA in subjects with new-onset type 1 diabetes compared with age-matched control subjects. Our method provides a noninvasive approach for detecting Î² cell death in vivo that may be used to track the progression of diabetes and guide its treatment.
Bridging the Gap Between Preclinical and Clinical Microbicide Trials: Blind Evaluation of Candidate Gels in Murine Models of Efficacy and Safety
PloS One. 2011 | Pubmed ID: 22096611
Despite significant protection in preclinical studies, cellulose sulfate (CS) failed to protect women against HIV-1/2 and was associated with a trend toward increased HIV-1 acquisition in one of the clinical trials. These results highlight the need for preclinical tests more predictive of clinical outcomes. The objective of this study was to test coded vaginal gels, including CS, in murine models of safety and efficacy to determine the models' utility for evaluating future products.
Acute Effects of Remote Ischemic Preconditioning on Cutaneous Microcirculation--a Controlled Prospective Cohort Study
BMC Surgery. 2011 | Pubmed ID: 22111972
Therapeutic strategies aiming to reduce ischemia/reperfusion injury by conditioning tissue tolerance against ischemia appear attractive not only from a scientific perspective, but also in clinics. Although previous studies indicate that remote ischemic intermittent preconditioning (RIPC) is a systemic phenomenon, only a few studies have focused on the elucidation of its mechanisms of action especially in the clinical setting. Therefore, the aim of this study is to evaluate the acute microcirculatory effects of remote ischemic preconditioning on a distinct cutaneous location at the lower extremity which is typically used as a harvesting site for free flap reconstructive surgery in a human in-vivo setting.
Deutsches Ã„rzteblatt International. Oct, 2011 | Pubmed ID: 22114639
Cryptoglandular anal fistula arises in 2 per 10 000 persons per year and is most common in young men. Improper treatment can result in fecal incontinence and thus in impaired quality of life.
Options for Monitoring and Estimating Historical Carbon Emissions from Forest Degradation in the Context of REDD+
Carbon Balance and Management. 2011 | Pubmed ID: 22115360
Measuring forest degradation and related forest carbon stock changes is more challenging than measuring deforestation since degradation implies changes in the structure of the forest and does not entail a change in land use, making it less easily detectable through remote sensing. Although we anticipate the use of the IPCC guidance under the United Framework Convention on Climate Change (UNFCCC), there is no one single method for monitoring forest degradation for the case of REDD+ policy. In this review paper we highlight that the choice depends upon a number of factors including the type of degradation, available historical data, capacities and resources, and the potentials and limitations of various measurement and monitoring approaches. Current degradation rates can be measured through field data (i.e. multi-date national forest inventories and permanent sample plot data, commercial forestry data sets, proxy data from domestic markets) and/or remote sensing data (i.e. direct mapping of canopy and forest structural changes or indirect mapping through modelling approaches), with the combination of techniques providing the best options. Developing countries frequently lack consistent historical field data for assessing past forest degradation, and so must rely more on remote sensing approaches mixed with current field assessments of carbon stock changes. Historical degradation estimates will have larger uncertainties as it will be difficult to determine their accuracy. However improving monitoring capacities for systematic forest degradation estimates today will help reduce uncertainties even for historical estimates.
Proceedings of the National Academy of Sciences of the United States of America. Dec, 2011 | Pubmed ID: 22123958
Long distance cell-to-cell communication is critical for the development of multicellular organisms. In this respect, plants are especially demanding as they constantly integrate environmental inputs to adjust growth processes to different conditions. One example is thickening of shoots and roots, also designated as secondary growth. Secondary growth is mediated by the vascular cambium, a stem cell-like tissue whose cell-proliferating activity is regulated over a long distance by the plant hormone auxin. How auxin signaling is integrated at the level of cambium cells and how cambium activity is coordinated with other growth processes are largely unknown. Here, we provide physiological, genetic, and pharmacological evidence that strigolactones (SLs), a group of plant hormones recently described to be involved in the repression of shoot branching, positively regulate cambial activity and that this function is conserved among species. We show that SL signaling in the vascular cambium itself is sufficient for cambium stimulation and that it interacts strongly with the auxin signaling pathway. Our results provide a model of how auxin-based long-distance signaling is translated into cambium activity and suggest that SLs act as general modulators of plant growth forms linking the control of shoot branching with the thickening of stems and roots.
Military Medicine. Oct, 2011 | Pubmed ID: 22128648
There is great focus within the military medical community regarding the ever growing cost of medical care overall and dependent care specifically. A great deal of discussion relates to the delivery of care through a growing military-civilian partnership, where an increased amount of health care will be referred to an ever growing network of civilian providers. The U.S. military establishment now stands at an important crossroad leading into the future of dependent care. However, the special concerns, which arise from the responsibility of caring for military dependents, are not a solely recent phenomenon. Ever since the establishment of a permanent standing U.S. Army in the late 1700s, there have been families in need of medical treatment. Although changes occurred continuously, the development and evolution of policies regulating the delivery of medical care to dependants can be divided into three periods. The first is the longest and ranges from the establishment of the Army until the year 1900. The second period spans from 1900 to the post-Korean War year of 1956. The third and final period is from 1956 to 1975. Special changes and advances in each of these periods have served to shape the face of dependent care in today's Army Medical Department.
A Model for Collaborative Laboratory Experiences Between Higher Education and a High School Technical Preparation Program: Promoting Higher Education, Mentoring, and Research
Advances in Physiology Education. Dec, 2011 | Pubmed ID: 22139787
The Effects of Enamel Matrix Derivative and Cyclic Mechanical Strain on Human Gingival Fibroblasts in an in Vitro Defect Healing Model
The International Journal of Periodontics & Restorative Dentistry. Nov-Dec, 2011 | Pubmed ID: 22140669
Gingival fibroblasts (GFs) play a considerable role in the maintenance of the gingival apparatus as well as in connective tissue repair. Mobility of a periodontal wound or soft tissue graft can impair connective tissue healing from the GFs. Enamel matrix derivative (EMD) is an enamel matrix protein used clinically for periodontal regeneration of intrabony defects and furcations, as well as treatment of gingival margin recessions. The goal of this project was to compare the effects of varying concentrations of EMD, with and without cyclic mechanical strain, on cellular wound fill of human GFs using an in vitro defect healing model. GFs were seeded and cultured in six-well flexible-bottomed plates. A 3-mm wound was created in the central portion of each confluent well. Three wells were treated with each EMD concentration of 0 Îœg/mL (control), 30 Îœg/mL, 60 Îœg/mL, or 120 Îœg/mL. The plates were placed in an incubator containing a strain unit to subject test plates to cyclic strain. An identical set of control plates were not flexed. Cells were examined on days 4, 8, 12, and 16. Microphotographs were taken and wound fill measurements made using image analysis software. The percent wound fill was calculated. All nonflexed plates, regardless of EMD concentration, reached > 90% defect fill at similar rates by day 16. However, in the flexed plates, EMD had a significant negative effect on defect fill. The defect fill was 55.7% for 0 Îœg/mL EMD, 48.2% for 30 Îœg/mL EMD, 36.7% for 60 Îœg/mL EMD, and 34.1% for 120 Îœg/mL EMD on day 16 for the flexed GFs. EMD, in concentrations as high as 120 Îœg/mL, did not significantly affect the amount of defect fill with nonflexed GFs. However, when the GFs were flexed, the addition of EMD had a significant negative effect on defect fill in a dose-dependent manner.
Current Chemical Genomics. 2011 | Pubmed ID: 22145013
The recognition of methyl-lysine and -arginine residues on both histone and other proteins by specific "reader" elements is important for chromatin regulation, gene expression, and control of cell-cycle progression. Recently the crucial role of these reader proteins in cancer development and dedifferentiation has emerged, owing to the increased interest among the scientific community. The methyl-lysine and -arginine readers are a large and very diverse set of effector proteins and targeting them with small molecule probes in drug discovery will inevitably require a detailed understanding of their structural biology and mechanism of binding. In the following review, the critical elements of methyl-lysine and -arginine recognition will be summarized with respect to each protein family and initial results in assay development, probe design, and drug discovery will be highlighted.
Carbon Balance and Management. 2011 | Pubmed ID: 22204698
The paper reviews a number of challenges associated with reducing degradation and its related emissions through national approaches to REDD+ under UNFCCC policy. It proposes that in many countries, it may in the short run be easier to deal with the kinds of degradation that result from locally driven community over-exploitation of forest for livelihoods, than from selective logging or fire control. Such degradation is low-level, but chronic, and is experienced over very large forest areas. Community forest management programmes tend to result not only in reduced degradation, but also in forest enhancement; moreover they are often popular, and do not require major political shifts. In principle these approaches therefore offer a quick start option for REDD+. Developing reference emissions levels for low-level locally driven degradation is difficult however given that stock losses and gains are too small to be identified and measured using remote sensing, and that in most countries there is little or no forest inventory data available. We therefore propose that forest management initiatives at the local level, such as those promoted by community forest management programmes, should monitor, and be credited for, only the net increase in carbon stock over the implementation period, as assessed by ground level surveys at the start and end of the period. This would also resolve the problem of nesting (ensuring that all credits are accounted for against the national reference emission level), since communities and others at the local level would be rewarded only for increased sequestration, while the national reference emission level would deal only with reductions in emissions from deforestation and degradation.
[Viability of Autologous Fat Grafts Harvested with the Coleman Technique and the Tissu Trans System (shippert Method): a Comparative Study]
Handchirurgie, Mikrochirurgie, Plastische Chirurgie : Organ Der Deutschsprachigen Arbeitsgemeinschaft FÃ¼r Handchirurgie : Organ Der Deutschsprachigen Arbeitsgemeinschaft FÃ¼r Mikrochirurgie Der Peripheren Nerven Und GefÃ¤sse : Organ Der Vereinigung Der Deutschen Plastischen Chirurgen. Dec, 2011 | Pubmed ID: 22241519
Various methods for harvesting and refining autologous fat grafts have been described. One of the standard procedures, the Coleman technique, is based on manual aspiration to reduce the negative presssure and the centrifugation of the grafts. The Shippert technique uses automatic liposuction with reduced negative pressure and abstains from centifugation in order not to reduce viability of the graft by exposing it to centrifugal forces. This study intends to compare the viability of fat grafts processed with the above-mentioned methods.Fat grafts were obtained in 9 patients by using both the Tissu Trans system (Shippert technique) and the Coleman technique. To evaluate the impact of centrifugation forces, the grafts harvested with the Coleman technique were treated with standard adjustment of the centrifuge and also with doubled g-force. Viability of fat grafts was analysed with the WST-8 test and with annexin V/PI assay FACS analysis.The viability of fat grafts processed by the Coleman technique was significantly higher compared to the Shippert technique on applying the WST-8 test. Applying the annexin V/PI analysis, the viability of fat grafts was almost equal with both techniques. Whereas the fat grafts processed with the Tissu Trans system are injected without condensation, the grafts refined with the Coleman technique were concentrated 3 times by centrifugation compared to the primary liposuctioned graft volumes.The Coleman technique allows the preparation of a fat graft containing more viable cells than the Shippert technique. This is in part due to the condensation of the graft by centrifugation using the Coleman technique. The factor of condensation of the grafts harvested and refined with the Coleman technique exceeds the factor of increased fat graft viability in comparison to the Shippert technique. The Tissu Trans system is more than twice as fast and easier to use with a preferential use for large volume grafts like in breast augmentation, whereas the Coleman technique produces a more condensed graft, favouring it for fat grafting to the face where less volume is needed.
Dynamics of Cell-mediated Immune Responses to Cytomegalovirus in Pediatric Transplantation Recipients
Pediatric Transplantation. Feb, 2012 | Pubmed ID: 21762326
CMI responses, combined with quantification of CMV DNA (DNAemia), may identify transplantation recipients at risk for invasive disease. PBMC were collected in pediatric transplantation candidates at one, three, and sixâ€ƒmonths post-transplant in 10 subjects (six renal, three cardiac, one stem cell) and at single time points in eight HC and 14 children greater than oneâ€ƒyr post-transplant (LTTx). Cells were stimulated with anti-CD3mAb or CMV pp65 peptide pools and responses assessed by IFNG enzyme-linked immunosorbent spot assay and cytokine secretion. IFNG responses to anti-CD3mAb were significantly lower pretransplant relative to HC and were further decreased at one and threeâ€ƒmonths post-transplant, but recovered to levels comparable to HC by sixâ€ƒmonths. Responses to pp65 among CMV-seropositive recipients followed a similar pattern but recovered by threeâ€ƒmonths. CMV-seropositive LTTx and HC showed a Th1 cytokine response to pp65 stimulation. Three LTTx subjects developed CMV DNAemia; two demonstrated decreased responses to anti-CD3mAB (and pp65 in the CMV seropositive subject) at the onset of DNAemia, which recovered as DNAemia resolved. Monitoring CMI in children is feasible and may provide an adjunct biomarker to predict CMV progression and recovery.
Progressive Multifocal Leukoencephalopathy After Treatment with Rituximab, Fludarabine and Cyclophosphamide in a Patient with Chronic Lymphocytic Leukemia
Leukemia & Lymphoma. Jan, 2012 | Pubmed ID: 21812535
Humoral and Cell-mediated Immune Responses to Monovalent 2009 Influenza A/H1N1 and Seasonal Trivalent Influenza Vaccines in High-risk Children
The Journal of Pediatrics. Jan, 2012 | Pubmed ID: 21840537
Humoral and cell-mediated immune responses to monovalent 2009 pandemic influenza A (H1N1/2009) and seasonal trivalent influenza (TIV) vaccines were evaluated in healthy children and children with asthma, sickle cell disease (SCD), systemic lupus erythematosus (SLE), and solid organ transplantation (SOT).
Computer-aided Detection of Colorectal Polyps in CT Colonography with and Without Fecal Tagging: a Stand-alone Evaluation
Investigative Radiology. Feb, 2012 | Pubmed ID: 21934519
To evaluate the stand-alone performance of a computer-aided detection (CAD) algorithm for colorectal polyps in a large heterogeneous CT colonography (CTC) database that included both tagged and untagged datasets.
The Journal of Endocrinology. Jan, 2012 | Pubmed ID: 22007021
White adipose tissue (WAT) produces a number of metabolically important factors and, therefore, some inborn errors of metabolism may potentially be corrected by transplantation of normal allogeneic WAT. To explore the ability of human WAT (HuWAT) to compensate for a missing factor and to induce allogeneic immune response, we created leptin-deficient, immunodeficient mice and transplanted them with either 2Â·5 or 5â€Šml HuWAT. Recipient mice showed stable levels of human leptin in circulation, reduced body mass gain, and amelioration of hepatic steatosis. Food consumption and plasma insulin levels were reduced only in recipients of 5â€Šml WAT. Transfer of 2Ã—10(7) human mononuclear cells to reject WAT as an allograft was ineffective and resulted only in some reduction of circulating leptin and a limited damage to the WAT grafts followed by the loss of human leukocytes.
European Journal of Human Genetics : EJHG. Mar, 2012 | Pubmed ID: 22027810
Alopecia areata (AA) is a common hair loss disorder, which is thought to be a tissue-specific autoimmune disease. Previous research has identified a few AA susceptibility genes, most of which are implicated in autoimmunity. To identify new genetic variants and further elucidate the genetic basis of AA, we performed a genome-wide association study using the strategy of pooled DNA genotyping (729 cases, 656 controls). The strongest association was for variants in the HLA region, which confirms the validity of the pooling strategy. The selected top 61 single-nucleotide polymorphisms (SNPs) were analyzed in an independent replication sample (454 cases, 1364 controls). Only one SNP outside of the HLA region (rs304650) showed significant association. This SNP was then analyzed in a second independent replication sample (537 cases, 657 controls). The finding was not replicated on a significant level, but showed the same tendency. A combined analysis of the two replication samples was then performed, and the SNP rs304650 showed significant association with P=3.43 Ã— 10(-4) (OR=1.24 (1.10-1.39)). This SNP maps to an intronic region of the SPATA5 (spermatogenesis-associated protein 5) gene on chromosome 4. The results therefore suggest the SPATA5 locus is a new susceptibility locus for AA.
Synergistic Reversal of Type 1 Diabetes in NOD Mice with Anti-CD3 and Interleukin-1 Blockade: Evidence of Improved Immune Regulation
Diabetes. Jan, 2012 | Pubmed ID: 22043003
Inflammatory cytokines are involved in autoimmune diabetes: among the most prominent is interleukin (IL)-1Î². We postulated that blockade of IL-1Î² would modulate the effects of anti-CD3 monoclonal antibody (mAb) in treating diabetes in NOD mice. To test this, we treated hyperglycemic NOD mice with F(ab')(2) fragments of anti-CD3 mAb with or without IL-1 receptor antagonist (IL-1RA), or anti-IL-1Î² mAb. We studied the reversal of diabetes and effects of treatment on the immune system. Mice that received a combination of anti-CD3 mAb with IL-1RA showed a more rapid rate of remission of diabetes than mice treated with anti-CD3 mAb or IL-1RA alone. Combination-treated mice had increased IL-5, IL-4, and interferon (IFN)-Î³ levels in circulation. There were reduced pathogenic NOD-relevant V7 peptide-V7(+) T cells in the pancreatic lymph nodes. Their splenocytes secreted more IL-10, had increased arginase expression in macrophages and dendritic cells, and had delayed adoptive transfer of diabetes. After 1 month, there were increased concentrations of IgG1 isotype antibodies and reduced intrapancreatic expression of IFN-Î³, IL-6, and IL-17 despite normal splenocyte cytokine secretion. These studies indicate that the combination of anti-CD3 mAb with IL-1RA is synergistic in reversal of diabetes through a combination of mechanisms. The combination causes persistent remission from islet inflammation.
Veterinary Microbiology. Jan, 2012 | Pubmed ID: 22074857
[The Effects of Multimodal Intervention for the Primary Prevention of Cardiovascular Diseases on Depression, Anxiety, and Type-D Pattern: Initial Results of the Randomized Controlled PreFord Trial]
Herz. Feb, 2012 | Pubmed ID: 22095021
Depression, anxiety, and Type-D pattern are associated with the earlier development and faster progression of cardiovascular disease (CVD). The aim of the randomized controlled PreFord trial was to improve multiple biological and psychosocial risk factors in the primary prevention of CVD. A total of 447 women and men with an ESC risk score >5% were randomly assigned to either multimodal or routine care groups. Somatic and psychosocial variables (HADS, DS-14) were assessed before and after the intervention, and annually for 2 years thereafter. The intervention showed no significant effects on the symptoms of depression, anxiety, and type D personality, either in the whole sample or in those with elevated scores at baseline. Thus, our study did not provide evidence that symptoms of depression, anxiety, or Type D personality can be effectively treated by multimodal behavioral interventions for the primary prevention of CVD.
Virology. Jan, 2012 | Pubmed ID: 22099967
We demonstrate that HPV-16 E7 forms a complex with Miz-1. UV-induced expression of the CDK-inhibitor p21(Cip1) and subsequent cell cycle arrest depends upon endogenous Miz-1 in HPV-negative C33A cervical cancer cells containing mutated p53. Transient expression of E7 in C33A inhibits UV-induced expression of p21(Cip1) and overcomes Miz-1-induced G1-phase arrest. The C-terminal E7Î”79LEDLL83-mutant with reduced Miz-1-binding capacity was impaired in its capability to repress p21(Cip1) expression; whereas the pRB-binding-deficient E7C24G-mutant inhibited p21(Cip1) expression similar to wild-type E7. Using ChIP, we demonstrate that endogenous E7 is bound to the endogenous p21(Cip1) core-promoter in CaSki cells and RNAi-mediated knock down of Miz-1 abrogates E7-binding to the p21(Cip1) promoter. Co-expression of E7 with Miz-1 inhibited Miz-1-induced p21(Cip1) expression from the minimal-promoter via Miz-1 DNA-binding sites. Co-expression of E7Î”79LEDLL83 did not inhibit Miz-1-induced p21(Cip1) expression. E7C24G retained E7-wild-type capability to inhibit Miz-1-dependent transactivation. These findings suggest that HPV-16 E7 can repress Miz-1-induced p21(Cip1) gene expression.
Neuroscience. Jan, 2012 | Pubmed ID: 22100786
Present knowledge about the serotonergic system in birdbrains is very limited, although the pigeon was used as an animal model in various studies focused on the behavioral effects of serotonergic transmission. In the mammalian brain the 5-HT(1A) receptor is the most widespread serotonin receptor type, and is involved in various functions. Less is known about the distribution of 5-HT(1A) receptors in the avian species. Therefore, we analyzed serotonin 5-HT(1A) receptor binding sites in the pigeon brain using quantitative in vitro receptor autoradiography with the selective radioligand [Â³H]-8-hydroxy-2-(di-n-propylamino)tetralin ([Â³H]-8-OH-DPAT). The receptor is differentially distributed throughout the pigeon brain. High levels of 5-HT(1A) receptors are found in the nucleus pretectalis (PT). Moderate densities were detected in the tectum, as well as in the telencephalic nidopallium and hyperpallium. Very low levels were found in the hippocampal formation, the amygdaloid complex, the basal ganglia, and several thalamic nuclei. Furthermore, local variations in 5-HT(1A) receptor densities support the concept of further subdivisions of the entopallium. The regional distribution patterns of 5-HT(1A) receptors mostly display a similar distribution as found in homologue brain structures of mammals.
Colorectal Disease : the Official Journal of the Association of Coloproctology of Great Britain and Ireland. Sep, 2012 | Pubmed ID: 22122680
Surgical closure of high or complex anal fistulae is often a difficult challenge. A special Nitinol clip, the OTSC clip (Ovesco AG), was evaluated for fistula closure in a porcine model.
Archives of Disease in Childhood. Mar, 2012 | Pubmed ID: 22123735
Streptococcus Pneumoniae Stimulates a STING- and IFN Regulatory Factor 3-dependent Type I IFN Production in Macrophages, Which Regulates RANTES Production in Macrophages, Cocultured Alveolar Epithelial Cells, and Mouse Lungs
Journal of Immunology (Baltimore, Md. : 1950). Jan, 2012 | Pubmed ID: 22156592
Streptococcus pneumoniae is the leading cause of community-acquired pneumonia. In this study, we examine an innate immune recognition pathway that senses pneumococcal infection, triggers type I IFN production, and regulates RANTES production. We found that human and murine alveolar macrophages as well as murine bone marrow macrophages, but not alveolar epithelial cells, produced type I IFNs upon infection with S. pneumoniae. This response was dependent on the pore-forming toxin pneumolysin and appeared to be mediated by a cytosolic DNA-sensing pathway involving the adapter molecule STING and the transcription factor IFN regulatory factor 3. Indeed, DNA was present in the cytosol during pneumococcal infection as indicated by the activation of the AIM2 inflammasome, which is known to sense microbial DNA. Type I IFNs produced by S. pneumoniae-infected macrophages positively regulated gene expression and RANTES production in macrophages and cocultured alveolar epithelial cells in vitro. Moreover, type I IFNs controlled RANTES production during pneumococcal pneumonia in vivo. In conclusion, we identified an immune sensing pathway detecting S. pneumoniae that triggers a type I IFN response and positively regulates RANTES production.
Synthesis and Anticonvulsant Activity of Novel 2,6-diketopiperazine Derivatives. Part 2: Perhydropyrido[1,2-a]pyrazines
European Journal of Medicinal Chemistry. Feb, 2012 | Pubmed ID: 22178094
A new series of chiral pyrido[1,2-a]pyrazine derivatives was synthesised and evaluated in inÂ vivo animal models of epilepsy. A significant influence of the stereochemistry of the pyrido[1,2-a]pyrazine framework on the pharmacological activity was observed. Compounds with (4R,9aS) absolute configuration proved inactive, whereas other stereoisomers exhibited markedly dissimilar spectra of anti-seizure efficacy in the maximal electroshock seizure (MES), subcutaneous Metrazol seizure (scMET) and Pilocarpine-induced status prevention (PISP) tests. Importantly, the investigated agents revealed high potency in the 6Hz model, with the ED(50) values comparable to the reference drug Levetiracetam. Derivatives (4S,9aR)-6 and (4R,9aR)-6 emerged as promising new lead structures, the former having a broad spectrum of anticonvulsant activity and the latter showing high potency in 6Hz and PISP models.
Journal of Computational Chemistry. Mar, 2012 | Pubmed ID: 22183769
Methyllysine histone code readers constitute a new promising group of potential drug targets. For instance, L3MBTL1, a malignant brain tumor (MBT) protein, selectively binds mono- and di-methyllysine epigenetic marks (KMe, KMe(2) ) that eventually results in the negative regulation of multiple genes through the E2F/Rb oncogenic pathway. There is a pressing need in potent and selective small-molecule probes that would enable further target validation and might become therapeutic leads. Such an endeavor would require efficient tools to assess the free energy of protein-ligand binding. However, due to an unparalleled function of the MBT binding pocket (i.e., selective binding to KMe/KMe(2) ) and because of its distinctive structure representing a small aromatic "cage," an accurate assessment of its binding affinity to a ligand appears to be a challenging task. Here, we report a comparative analysis of computationally affordable affinity predictors applied to a set of seven small-molecule ligands interacting with L3MBTL1. The analysis deals with novel ligands and targets, but applies widespread computational approaches and intuitive comparison metrics that makes this study compatible with and incremental to earlier large scale accounts on the efficiency of affinity predictors. Ultimately, this study has revealed three top performers, far ahead of the other techniques, including two scoring functions, PMF04 and PLP, along with a simulation-based method MM-PB/SA. We discuss why some methods may perform better than others on this target class, the limits of their application, as well as how the efficiency of the most CPU-demanding techniques could be optimized.
Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry. Mar, 2012 | Pubmed ID: 22213552
We report on a minimal system to mimic intracellular transport of membrane-bounded, vesicular cargo. In a cell-free assay, purified kinesin-1 motor proteins were directly anchored to the membrane of giant unilamellar vesicles, and their movement studied along two-dimensional microtubule networks. Motion-tracking of vesicles with diameters of 1-3 Î¼m revealed traveling distances up to the millimeter range. The transport velocities were identical to velocities of cargo-free motors. Using total internal reflection fluorescence (TIRF) microscopy, we were able to estimate the number of GFP-labeled motors involved in the transport of a single vesicle. We found that the vesicles were transported by the cooperative activity of typically 5-10 motor molecules. The presented assay is expected to open up further applications in the field of synthetic biology, aiming at the in vitro reconstitution of sub-cellular multi-motor transport systems. It may also find applications in bionanotechnology, where the controlled long-range transport of artificial cargo is a promising means to advance current lab-on-a-chip systems.
Apoptosis : an International Journal on Programmed Cell Death. Apr, 2012 | Pubmed ID: 22223358
Fat cells are fragile cells with a short life span outside the body. Ways to reduce cell death in a biochemical way are almost unknown due to scarce information on the type of cellular death that is induced in fat tissue. This study was designed to investigate the apoptotic pathways of fat tissue in a permanent perfusion bioreactor system with the Hannover preservation solution and the Eurocollins solution in fat flaps of rats. In Lewis rats, the inguinal adipofascial flaps were elevated bilaterally and placed in a bioreactor at 37Â°C. To detect caspases 3, 8, 9 and 12, immunofluorescence stains of fat tissue specimen were analysed at several time points after preservation of flaps were placed in Hannover solution and Eurocollins solution for 10 days. An additional visual assessment of viability by a calcein based life/dead test was performed. It revealed a superior viability of the adipose tissue preserved in Hannover solution. Immunofluorescence staining demonstrated that apoptotic pathways via mitochondria, endoplasmatic reticulum and death receptors were activated, as Caspases 8, 9 and 12 were detected. Caspase 3 as an effector in the common apoptotic pathway was detected as well. Adipose tissue preserved at 37Â°C ex vivo in a bioreactor system undergoes apoptosis. Immunofluorescence examination of the fat tissue preserved ex vivo revealed that apoptotic pathways via mitochondria, endoplasmatic reticulum and death receptors are being activated. Significantly less activation of Caspase 3, 8, 9 and 12 in flaps preserved in Hannover solution in comparison to Eurocollins was found, supporting the anti apoptotic characteristics of Hannover solution. Based on these findings, further research to modify the apoptotic pathways to ameliorate viability of fat tissue can be performed.
Colorectal Disease : the Official Journal of the Association of Coloproctology of Great Britain and Ireland. Feb, 2012 | Pubmed ID: 22233119
Veterinary and Comparative Oncology. Dec, 2012 | Pubmed ID: 22236280
Thymidine kinase 1 (TK1) is a soluble biomarker associated with DNA synthesis. This prospective study evaluated serum TK1 activity in dogs presenting with hemoabdomen and a splenic mass. An ELISA using azidothymidine as a substrate was used to evaluate TK1 activity. Sixty-two dogs with hemoabdomen and 15 normal controls were studied. Serum TK1 activity was significantly higher in dogs with hemangiosarcoma (HSA) than in normal dogs (mean Â± SEM = 17.0 Â± 5.0 and 2.01 Â± 0.6, respectively), but not dogs with benign disease (mean Â± SEM = 10.0 Â± 3.3). Using a cut-off of 6.55 U/L, TK activity demonstrated a sensitivity of 0.52, specificity of 0.93, positive predictive value of 0.94 and negative predictive value of 0.48 for distinguishing HSA versus normal. When interval thresholds of <1.55 and >7.95 U/L were used together, diagnostic utility was increased. Serum TK1 evaluation may help to discriminate between benign disease and HSA in dogs with hemoabdomen and a splenic mass.
Virtual Non-contrast in Second-generation, Dual-energy Computed Tomography: Reliability of Attenuation Values
European Journal of Radiology. Mar, 2012 | Pubmed ID: 22236702
To evaluate the reliability of attenuation values in virtual non-contrast images (VNC) reconstructed from contrast-enhanced, dual-energy scans performed on a second-generation dual-energy CT scanner, compared to single-energy, non-contrast images (TNC).
Dento Maxillo Facial Radiology. Jan, 2012 | Pubmed ID: 22241868
The most common manifestation of plasma cell neoplasms is multiple myeloma. Solitary and localised tumours in the form of solitary plasmacytoma of the bone or extramedullary plasmacytoma are rare. In the late stages of multiple myeloma, bulky bone tumour infiltrates may be found which may be the primary clinical manifestation of the previously unknown malignancy. We report a case of a hyoid bone tumour with extramedullary plasma cell infiltrates in the oropharynx in multiple myeloma.
Intra-anal Iferanserin 10 Mg BID for Hemorrhoid Disease: a Prospective, Randomized, Double-blind, Placebo-controlled Trial
Clinical Therapeutics. Feb, 2012 | Pubmed ID: 22244049
Despite the prevalence of internal hemorrhoid disease (HD), there are few pharmacologic options. Iferanserin, a selective serotonin receptor antagonist, is being studied for use in the treatment of HD.
Negative Pressure of Manual Liposuction with Coleman Technique is Highly Dependant on the Position of Plunger of the Syringe
Journal of Plastic, Reconstructive & Aesthetic Surgery : JPRAS. Jul, 2012 | Pubmed ID: 22264398
Overdiagnosis of a Typical Carcinoid Tumor As an Adenocarcinoma of the Lung: a Case Report and Review of the Literature
World Journal of Surgical Oncology. 2012 | Pubmed ID: 22269186
Overdiagnosis of bronchopulmonary carcinoid tumors together with overtreatment can cause serious postoperative consequences for the patient. We report of a patient with a typical bronchopulmonary carcinoid tumor, which was initially misdiagnosed and treated as an adenocarcinoma of the lung. GnrH receptors and the associated Raf-1/MEK/ERK-1/2-pathway are potential targets for analogs in cancer treatment. We suspected a correlation between the lack of tumor growth, application of leuprolide and the Raf-1/MEK/ERK-1/2-pathway. Therefore, we examined GnrH receptor status in the examined specimen.
Science Translational Medicine. Jan, 2012 | Pubmed ID: 22277969
The development and optimization of immune therapies in patients has been hampered by the lack of preclinical models in which their effects on human immune cells can be studied. As a result, observations that have been made in preclinical studies have suggested mechanisms of drug action in murine models that have not been confirmed in clinical studies. Here, we used a humanized mouse reconstituted with human hematopoietic stem cells to study the mechanism of action of teplizumab, an Fc receptor nonbinding humanized monoclonal antibody to CD3 being tested in clinical trials for the treatment of patients with type 1 diabetes mellitus. In this model, human gut-tropic CCR6(+) T cells exited the circulation and secondary lymph organs and migrated to the small intestine. These cells then produced interleukin-10 (IL-10), a regulatory cytokine, in quantities that could be detected in the peripheral circulation. Blocking T cell migration to the small intestine with natalizumab, which prevents cellular adhesion by inhibiting Î±(4) integrin binding, abolished the treatment effects of teplizumab. Moreover, IL-10 expression by CD4(+)CD25(high)CCR6(+)FoxP3 cells returning to the peripheral circulation was increased in patients with type 1 diabetes treated with teplizumab. These findings demonstrate that humanized mice may be used to identify novel immunologic mechanisms that occur in patients treated with immunomodulators.
Anti-apoptotic Mcl-1 is Essential for the Development and Sustained Growth of Acute Myeloid Leukemia
Genes & Development. Jan, 2012 | Pubmed ID: 22279045
Acute myeloid leukemia (AML) frequently relapses after initial treatment. Drug resistance in AML has been attributed to high levels of the anti-apoptotic Bcl-2 family members Bcl-x(L) and Mcl-1. Here we report that removal of Mcl-1, but not loss or pharmacological blockade of Bcl-x(L), Bcl-2, or Bcl-w, caused the death of transformed AML and could cure disease in AML-afflicted mice. Enforced expression of selective inhibitors of prosurvival Bcl-2 family members revealed that Mcl-1 is critical for survival of human AML cells. Thus, targeting of Mcl-1 or regulators of its expression may be a useful strategy for the treatment of AML.
German Medical Science : GMS E-journal. 2012 | Pubmed ID: 22294976
Advanced strategies in reconstructive microsurgery and especially free tissue transfer with advanced microvascular techniques have been routinely applied and continuously refined for more than three decades in day-to-day clinical work. Bearing in mind the success rates of more than 95%, the value of these techniques in patient care and comfort (one-step reconstruction of even the most complex tissue defects) cannot be underestimated. However, anticoagulative protocols and practices are far from general acceptance and - most importantly - lack the benchmark of evidence basis while the reconstructive and microsurgical methods are mostly standardized. Therefore, the aim of our work was to review the actual literature and synoptically lay out the mechanisms of action of the plethora of anticoagulative substances. The pharmacologic prevention and the surgical intervention of thrombembolic events represent an established and essential part of microsurgery. The high success rates of microvascular free tissue transfer as of today are due to treatment of patients in reconstructive centers where proper patient selection, excellent microsurgical technique, tissue transfer to adequate recipient vessels, and early anastomotic revision in case of thrombosis is provided. Whether the choice of antithrombotic agents is a factor of success remains still unclear. Undoubtedly however the lack of microsurgical experience and bad technique can never be compensated by any regimen of antithrombotic therapy. All the more, the development of consistent standards and algorithms in reconstructive microsurgery is absolutely essential to optimize clinical outcomes and increase multicentric and international comparability of postoperative results and complications.
Metabolomics: a Tool for Early Detection of Toxicological Effects and an Opportunity for Biology Based Grouping of Chemicals-from QSAR to QBAR
Mutation Research. Aug, 2012 | Pubmed ID: 22305969
BASF has developed a Metabolomics database (MetaMap(Â®) Tox) containing approximately 500 data rich chemicals, agrochemicals and drugs. This metabolome-database has been built based upon 28-day studies in rats (adapted to OECD 407 guideline) with blood sampling and metabolic profiling after 7, 14 and 28 days of test substance treatment. Numerous metabolome patterns have been established for different toxicological targets (liver, kidney, thyroid, testes, blood, nervous system and endocrine system) which are specific for different toxicological modes of action. With these patterns early detection of toxicological effects and the underlying mechanism can now be obtained from routine studies. Early recognition of toxicological mode of action will help to develop new compounds with a more favourable toxicological profile and will also help to reduce the number of animal studies necessary to do so. Thus this technology contributes to animal welfare by means of reduction through refinement (2R), but also has potential as a replacement method by analyzing samples from in vitro studies. With respect to the REACH legislation for which a large number of animal studies will need to be performed, one of the most promising methods to reduce the number of animal experiments is grouping of chemicals and read-across to those which are data rich. So far mostly chemical similarity or QSAR models are driving the selection process of chemical grouping. However, "omics" technologies such as metabolomics may help to optimize the chemical grouping process by providing biologically based criteria for toxicological equivalence. "From QSAR to QBAR" (quantitative biological activity relationship).
Plant Physiology. Apr, 2012 | Pubmed ID: 22323776
Adventitious root formation is essential for the propagation of many commercially important plant species and involves the formation of roots from nonroot tissues such as stems or leaves. Here, we demonstrate that the plant hormone strigolactone suppresses adventitious root formation in Arabidopsis (Arabidopsis thaliana) and pea (Pisum sativum). Strigolactone-deficient and response mutants of both species have enhanced adventitious rooting. CYCLIN B1 expression, an early marker for the initiation of adventitious root primordia in Arabidopsis, is enhanced in more axillary growth2 (max2), a strigolactone response mutant, suggesting that strigolactones restrain the number of adventitious roots by inhibiting the very first formative divisions of the founder cells. Strigolactones and cytokinins appear to act independently to suppress adventitious rooting, as cytokinin mutants are strigolactone responsive and strigolactone mutants are cytokinin responsive. In contrast, the interaction between the strigolactone and auxin signaling pathways in regulating adventitious rooting appears to be more complex. Strigolactone can at least partially revert the stimulatory effect of auxin on adventitious rooting, and auxin can further increase the number of adventitious roots in max mutants. We present a model depicting the interaction of strigolactones, cytokinins, and auxin in regulating adventitious root formation.
Dilute and Shoot: Analysis of Drugs of Abuse Using Selected Reaction Monitoring for Quantification and Full Scan Product Ion Spectra for Identification
Journal of Analytical Toxicology. Mar, 2012 | Pubmed ID: 22337779
Our objective was to develop a "dilute and shoot" liquid chromatography-tandem mass spectrometry confirmatory procedure that uses full scan product ion spectra to identify drugs that are present above cutoff values as determined by isotope dilution relative to a deuterium-labeled internal standard. Deuterium-labeled internal standards are added to urine which is then diluted prior to analysis. Full scan product ion spectra were obtained in the data-dependent mode using a linear ion trap (ABI 4000 Qtrap). Identification was based on a purity fit of greater than 70. Ninety-seven urine specimens were analyzed by the method described, and results were compared to values obtained from a reference laboratory using selected reaction monitoring (SRM). The ion trap provided about 30-fold increase in signal-to-noise ratio as compared with the same instrument operated in a traditional full scan product ion mode. The assays were linear to at least 10 times the cutoff. Selecting appropriate triggers for obtaining full scan product ion spectra minimized space charging for specimens that contained high concentrations of drugs. There was 100% concordance between the full scan identification and the SRM results for identification of amphetamine, methamphetamine, benzoylecgonine, morphine, codeine, hydrocodone, and hydromorphone. The ability to "dilute and shoot" reduces the turnaround time for results. The data acquired with SRM and full scan product ion spectra provide accurate quantification and a high degree of specificity.
Experimental Cell Research. Jul, 2012 | Pubmed ID: 22342458
The function of the anti-apoptotic Bcl-2 family member Bcl2a1/Bfl-1/A1 is poorly understood due to the lack of appropriate loss-of-function mouse models and redundant effects with other Bcl-2 pro-survival proteins upon overexpression. Expression analysis of A1 suggests predominant roles in leukocyte development, their survival upon viral or bacterial infection, as well as during allergic reactions. In addition, A1 has been implicated in autoimmunity and the pathology and therapy resistance of hematological as well as solid tumors that may aberrantly express this protein. In this review, we aim to summarize current knowledge on A1 biology, focusing on its role in the immune system and compare it to that of other pro-survival Bcl-2 proteins.
Trends in Molecular Medicine. Mar, 2012 | Pubmed ID: 22342807
Type 1 diabetes is a common autoimmune disease that affects millions of people worldwide and has an incidence that is increasing at a striking rate, especially in young children. It results from the targeted self-destruction of the insulin-secreting Î² cells of the pancreas and requires lifelong insulin treatment. The effects of chronic hyperglycemia - the result of insulin deficiency - include secondary endorgan complications. Over the past two decades our increased understanding of the pathogenesis of this disease has led to the development of new immunomodulatory treatments. None have yet received regulatory approval, but this report highlights recent progress in this area.
Nature Methods. Apr, 2012 | Pubmed ID: 22343342
Local anesthetics effectively suppress pain sensation, but most of these compounds act nonselectively, inhibiting activity of all neurons. Moreover, their actions abate slowly, preventing precise spatial and temporal control of nociception. We developed a photoisomerizable molecule, quaternary ammonium-azobenzene-quaternary ammonium (QAQ), that enables rapid and selective optical control of nociception. QAQ is membrane-impermeant and has no effect on most cells, but it infiltrates pain-sensing neurons through endogenous ion channels that are activated by noxious stimuli, primarily TRPV1. After QAQ accumulates intracellularly, it blocks voltage-gated ion channels in the trans form but not the cis form. QAQ enables reversible optical silencing of mouse nociceptive neuron firing without exogenous gene expression and can serve as a light-sensitive analgesic in rats in vivo. Because intracellular QAQ accumulation is a consequence of nociceptive ion-channel activity, QAQ-mediated photosensitization is a platform for understanding signaling mechanisms in acute and chronic pain.
Journal of Leukocyte Biology. Jul, 2012 | Pubmed ID: 22345705
Programmed cell death is a crucial cellular response frequently observed in IV-infected tissue. This article reviews the current knowledge on the molecular virus-host interactions that induce apoptosis pathways in an IV-infected cell and the functional implications of these cellular signaling events on viral propagation at distinct steps during the viral replication cycle. Furthermore, it summarizes the role of IV-induced apoptosis pathways in equilibrating the host's antiviral immune response between effective viral clearance and development of severe apoptotic lung injury.
Der Radiologe. Feb, 2012 | Pubmed ID: 22349947
Development (Cambridge, England). Mar, 2012 | Pubmed ID: 22354838
The genome of higher eukaryotes exhibits a patchwork of inactive and active genes. The nuclear protein CCCTC-binding factor (CTCF) when bound to insulator sequences can prevent undesirable crosstalk between active and inactive genomic regions, and it can also shield particular genes from enhancer function, a role that has many applications in development. Exciting recent work has demonstrated roles for CTCF in, for example, embryonic, neuronal and haematopoietic development. Here, we discuss the underlying mechanisms of developmentally regulated CTCF-dependent transcription in relation to model genes, and highlight genome-wide results indicating that CTCF might play a master role in regulating both activating and repressive transcription events at sites throughout the genome.
Using "standardized Narratives" to Explore New Ways to Represent Faculty Opinions of Resident Performance
Academic Medicine : Journal of the Association of American Medical Colleges. Apr, 2012 | Pubmed ID: 22361788
Most efforts to develop reliable evaluations of clinical competence have been oriented toward deconstructing the requisite competencies into separate scales. However, many are questioning the value of this approach on theoretical and empirical bases. This study uses "standardized narratives" to explore a different approach to assessing resident performance.
International Journal of Colorectal Disease. Feb, 2012 | Pubmed ID: 22362468
BACKGROUND: The incidence of anal abscess is relatively high, and the condition is most common in young men. METHODS: A systematic review of the literature was undertaken. RESULTS: This abscess usually originates in the proctodeal glands of the intersphincteric space. A distinction is made between subanodermal, intersphincteric, ischioanal, and supralevator abscesses. The patient history and clinical examination are diagnostically sufficient to establish the indication for surgery. Further examinations (endosonography, MRI) should be considered in recurrent abscesses or supralevator abscesses. The timing of the surgical intervention is primarily determined by the patient's symptoms, and acute abscess is generally an indication for emergency treatment. Anal abscesses are treated surgically. The type of access (transrectal or perianal) depends on the abscess location. The goal of surgery is thorough drainage of the focus of infection while preserving the sphincter muscles. The wound should be rinsed regularly (using tap water). The use of local antiseptics is associated with a risk of cytotoxicity. Antibiotic treatment is only necessary in exceptional cases. Intraoperative fistula exploration should be conducted with extreme care if at all; no requirement to detect fistula should be imposed. The risk of abscess recurrence or secondary fistula formation is low overall, but they can result from insufficient drainage. Primary fistulotomy should only be performed in case of superficial fistulas and by experienced surgeons. In case of unclear findings or high fistulas, repair should take place in a second procedure. CONCLUSION: In this clinical S3 guideline, instructions for diagnosis and treatment of anal abscess are described for the first time in Germany.
Reducing RF-related Heating of Cardiac Pacemaker Leads in MRI: Implementation and Experimental Verification of Practical Design Changes
Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine. Dec, 2012 | Pubmed ID: 22383393
There are serious concerns regarding safety when performing magnetic resonance imaging in patients with implanted conductive medical devices, such as cardiac pacemakers, and associated leads, as severe incidents have occurred in the past. In this study, several approaches for altering an implant's lead design were systematically developed and evaluated to enhance the safety of implanted medical devices in a magnetic resonance imaging environment. The individual impact of each design change on radiofrequency heating was then systematically investigated in functional lead prototypes at 1.5 T. Radiofrequency-induced heating could be successfully reduced by three basic changes in conventional pacemaker lead design: (1) increasing the lead tip area, (2) increasing the lead conductor resistance, and (3) increasing outer lead insulation conductivity. The findings show that radiofrequency energy pickup in magnetic resonance imaging can be reduced and, therefore, patient safety can be improved with dedicated construction changes according to a "safe by design" strategy. Incorporation of the described alterations into implantable medical devices such as pacemaker leads can be used to help achieve favorable risk-benefit-ratios when performing magnetic resonance imaging in the respective patient group.
Human Heredity. 2012 | Pubmed ID: 22399020
Pathway association analysis (PAA) tests for an excess of moderately significant SNPs in genes from a common pathway.
Efficient Electroformation of Supergiant Unilamellar Vesicles Containing Cationic Lipids on ITO-coated Electrodes
Langmuir : the ACS Journal of Surfaces and Colloids. Apr, 2012 | Pubmed ID: 22424289
Giant unilamellar vesicles (GUVs) represent a versatile in vitro system widely used to study properties of lipid membranes and their interaction with biomacromolecules and colloids. Electroformation with indium tin oxide (ITO) coated coverslips as electrodes is a standard approach to GUV production. In the case of cationic GUVs, however, application of this approach leads to notorious difficulties. We discover that this is related to aging of ITO-coated coverslips during their repeated use, which is reflected in their surface topography on the nanoscale. We find that mild annealing of the ITO-coated surface in air reverts the effects of aging and ensures efficient reproducible electroformation of supergiant (diameter > 100 Î¼m) unilamellar vesicles containing cationic lipids.
Deutsche Medizinische Wochenschrift (1946). Mar, 2012 | Pubmed ID: 22434177
[Free Latissimus Dorsi Flap Transfer for Reconstruction of Soft Tissue Defects of the Lower Extremity]
Operative OrthopÃ¤die Und Traumatologie. Apr, 2012 | Pubmed ID: 22446843
Sustainable and durable soft tissue coverage at the lower extremity following trauma, tumor resections, sequelae of radiation therapy or osteomyelitis using free latissimus dorsi muscle transfer is provided by a free latissimus dorsi muscle flap.
Intravaginal Ring Delivery of Tenofovir Disoproxil Fumarate for Prevention of HIV and Herpes Simplex Virus Infection
The Journal of Antimicrobial Chemotherapy. Jul, 2012 | Pubmed ID: 22467632
A safe and effective topical prevention strategy will likely require sustained delivery of potent antiviral drugs and a delivery system that simultaneously maximizes drug distribution and overcomes the behavioural challenges related to adherence. Activity against HIV and herpes simplex virus (HSV) would be advantageous, given the epidemiological link between the two pathogens. We hypothesize that tenofovir disoproxil fumarate (tenofovir DF), a prodrug of tenofovir, may be more potent than tenofovir and ideal for sustained intravaginal ring (IVR) delivery.
Frontiers in Pharmacology. 2012 | Pubmed ID: 22479247
The molecular mechanisms of modern inhaled anesthetics are still poorly understood although they are widely used in clinical settings. Considerable evidence supports effects on membrane proteins including ligand- and voltage-gated ion channels of excitable cells. Na(+) channels are crucial to action potential initiation and propagation, and represent potential targets for volatile anesthetic effects on central nervous system depression. Inhibition of presynaptic Na(+) channels leads to reduced neurotransmitter release at the synapse and could therefore contribute to the mechanisms by which volatile anesthetics produce their characteristic end points: amnesia, unconsciousness, and immobility. Early studies on crayfish and squid giant axon showed inhibition of Na(+) currents by volatile anesthetics at high concentrations. Subsequent studies using native neuronal preparations and heterologous expression systems with various mammalian Na(+) channel isoforms implicated inhibition of presynaptic Na(+) channels in anesthetic actions at clinical concentrations. Volatile anesthetics reduce peak Na(+) current (I(Na)) and shift the voltage of half-maximal steady-state inactivation (h(âˆž)) toward more negative potentials, thus stabilizing the fast-inactivated state. Furthermore recovery from fast-inactivation is slowed, together with enhanced use-dependent block during pulse train protocols. These effects can depress presynaptic excitability, depolarization and Ca(2+) entry, and ultimately reduce transmitter release. This reduction in transmitter release is more potent for glutamatergic compared to GABAergic terminals. Involvement of Na(+) channel inhibition in mediating the immobility caused by volatile anesthetics has been demonstrated in animal studies, in which intrathecal infusion of the Na(+) channel blocker tetrodotoxin increases volatile anesthetic potency, whereas infusion of the Na(+) channels agonist veratridine reduces anesthetic potency. These studies indicate that inhibition of presynaptic Na(+) channels by volatile anesthetics is involved in mediating some of their effects.
Increased Toxicity when Fibrates and Statins Are Administered in Combination--a Metabolomics Approach with Rats
Toxicology Letters. Jun, 2012 | Pubmed ID: 22484644
Combination therapies with fibrates and statins are used to treat cardiovascular diseases, because of their synergistic effect on lowering plasma lipids. However, fatal side-effects like rhabdomyolysis followed by acute renal necrosis sometimes occur. To elucidate biochemical changes resulting from the interaction of fibrates and statins, doses of 100 mg/kg fenofibrate, 50mg/kg clofibrate, 70 mg/kg atorvastatin and 200 mg/kg pravastatin as well as combinations thereof were administered to Crl:Wi(Han) rats for 4 weeks. Plasma metabolome profile was measured on study days 7, 14 and 28. Upon study termination, clinical pathology parameters were measured. In a separate experiment plasmakinetic data were measured in male rats after 1 week of drug administration in monotherapy as well as in combinations. Lowering of blood lipid levels as well as toxicological effects, like liver cell degradation (statins) and anemia (fibrates) and distinct blood metabolite level alterations were observed in monotherapy. When fibrates and statins were co-administered metabolite profile interactions were generally underadditive or at the utmost additive according to the linear mixed effect model. However, more metabolite levels were significantly altered during combination therapy. New effects on the antioxidant status and the cardiovascular system were found which may be related to a development of rhabdomyolysis. Accumulation of drugs during the combination therapy was not observed.
Efficacy and Safety Profile of Dronedarone in Clinical Practice. Preliminary Results of the Magdeburg Dronedarone Registry
International Journal of Cardiology. May, 2012 | Pubmed ID: 22494869
RAGE Expression in Human T Cells: a Link Between Environmental Factors and Adaptive Immune Responses
PloS One. 2012 | Pubmed ID: 22509345
The Receptor for Advanced Glycation Endproducts (RAGE) is a scavenger ligand that binds glycated endproducts as well as molecules released during cell death such as S100b and HMGB1. RAGE is expressed on antigen presenting cells where it may participate in activation of innate immune responses but its role in adaptive human immune responses has not been described. We have found that RAGE is expressed intracellularly in human T cells following TCR activation but constitutively on T cells from patients with diabetes. The levels of RAGE on T cells from patients with diabetes are not related to the level of glucose control. It co-localizes to the endosomes. Its expression increases in activated T cells from healthy control subjects but bystander cells also express RAGE after stimulation of the antigen specific T cells. RAGE ligands enhance RAGE expression. In patients with T1D, the level of RAGE expression decreases with T cell activation. RAGE+ T cells express higher levels of IL-17A, CD107a, and IL-5 than RAGE- cells from the same individual with T1D. Our studies have identified the expression of RAGE on adaptive immune cells and a role for this receptor and its ligands in modulating human immune responses.
Follow-up Study of the First Genome-wide Association Scan in Alopecia Areata: IL13 and KIAA0350 As Susceptibility Loci Supported with Genome-wide Significance
The Journal of Investigative Dermatology. Sep, 2012 | Pubmed ID: 22534877
Recently, the first genome-wide association study (GWAS) of alopecia areata (AA) was conducted in a North-American sample, and this identified eight susceptibility loci surpassing genome-wide significance. The aim of the present follow-up association analysis was to confirm five of these eight loci (single-nucleotide polymorphisms (SNPs) from the CTLA4, IL-2RA, and HLA regions were not included due to previous own findings) and test 12 other loci from the GWAS, which did not surpass the threshold for genome-wide significance. Twenty-three SNPs from the 17 loci were investigated using a sample of 1,702 Central European AA patients and 1,723 controls. Of the five loci with previously reported genome-wide significance, association was confirmed for all of these: ULBP3/ULBP6, PRDX5, IL-2/IL-21, STX17, and IKZF4/ERBB3 (P-value <0.05). To detect robust evidence for association among the 12 other loci, a meta-analysis of the present association data and the data of the recent GWAS was performed. Genome-wide significant association was found for rs20541 (P(comb)=7.52 Ã— 10(-10); odds ratio (OR)=1.30 (1.23-1.38)) and rs998592 (P(comb)=1.11 Ã— 10(-11); OR=1.28 (1.21-1.36)), thus establishing IL-13 and KIAA0350/CLEC16A as susceptibility loci for AA. Interestingly, IL-13 and KIAA0350/CLEC16A are susceptibility loci for other autoimmune diseases, supporting the hypothesis of shared pathways of autoimmune susceptibility.
Shock (Augusta, Ga.). Jun, 2012 | Pubmed ID: 22552018
Early detection and management of shock are important in optimizing clinical outcomes. One regional marker, sublingual capnography (SLCO2), is particularly appealing as redistribution of blood flow away from the sublingual mucosa can happen very early in the compensatory phase of hypovolemic shock. Our objective was to test the hypothesis that SLCO2 would detect early hypovolemia in a human laboratory model of hemorrhage: progressive lower body negative pressure until onset of cardiovascular collapse. Eighteen healthy nonsmoking subjects (10 males, 8 females) with mean age of 28 (SD, 8) years, body weight of 72 (SD, 13) kg, and height of 172 (SD, 9) cm were recruited to participate, of whom 17 completed the experiment. Average time to presyncope was 1,579 Â± 72 s (mean Â± SE). At the time of cardiovascular collapse, lower body negative pressure altered (P < 0.001) systolic blood pressure (mean Â± SE: 130 Â± 3 vs. 98 Â± 2 mm Hg), pulse pressure (mean Â± SE: 58 Â± 2 vs. 33 Â± 2 mm Hg), and heart rate (mean Â± SE: 63 Â± 3 vs. 102 Â± 6 beats/min) when compared with baseline, whereas SLCO2 did not change (49.1 Â± 1.0 vs. 48.6 Â± 1.5 mm Hg, P = 0.624). In a model of progressive central hypovolemia in humans, we did not detect metabolic derangements in the sublingual mucosa as measured by SLCO2.
Safety and Pharmacokinetics of Aciclovir in Women Following Release from a Silicone Elastomer Vaginal Ring
The Journal of Antimicrobial Chemotherapy. Aug, 2012 | Pubmed ID: 22556381
Systemic aciclovir and its prodrug valaciclovir are effective in treating and reducing recurrences of genital herpes simplex virus (HSV) and reducing transmission. Local aciclovir delivery, if it can achieve and maintain comparable intracellular genital tract levels, may be equally effective in the treatment and suppression of genital HSV. Intravaginal ring (IVR) delivery of aciclovir may provide pre-exposure prophylaxis against HSV acquisition.
In Vivo Imaging of Endogenous Pancreatic Î²-cell Mass in Healthy and Type 1 Diabetic Subjects Using 18F-fluoropropyl-dihydrotetrabenazine and PET
Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine. Jun, 2012 | Pubmed ID: 22573821
The ability to noninvasively measure endogenous pancreatic Î²-cell mass (BCM) would accelerate research on the pathophysiology of diabetes and revolutionize the preclinical development of new treatments, the clinical assessment of therapeutic efficacy, and the early diagnosis and subsequent monitoring of disease progression. The vesicular monoamine transporter type 2 (VMAT2) is coexpressed with insulin in Î²-cells and represents a promising target for BCM imaging.
Plasticity in D1-like Receptor Expression is Associated with Different Components of Cognitive Processes
PloS One. 2012 | Pubmed ID: 22574169
Dopamine D1-like receptors consist of D1 (D1A) and D5 (D1B) receptors and play a key role in working memory. However, their possibly differential contribution to working memory is unclear. We combined a working memory training protocol with a stepwise increase of cognitive subcomponents and real-time RT-PCR analysis of dopamine receptor expression in pigeons to identify molecular changes that accompany training of isolated cognitive subfunctions. In birds, the D1-like receptor family is extended and consists of the D1A, D1B, and D1D receptors. Our data show that D1B receptor plasticity follows a training that includes active mental maintenance of information, whereas D1A and D1D receptor plasticity in addition accompanies learning of stimulus-response associations. Plasticity of D1-like receptors plays no role for processes like response selection and stimulus discrimination. None of the tasks altered D2 receptor expression. Our study shows that different cognitive components of working memory training have distinguishable effects on D1-like receptor expression.
Targeting Antiapoptotic A1/Bfl-1 by in Vivo RNAi Reveals Multiple Roles in Leukocyte Development in Mice
Blood. Jun, 2012 | Pubmed ID: 22581448
Gene-targeting studies in mice have identified the essential roles of most prosurvival Bcl-2 family members in normal physiology and under conditions of stress. The function of one member, Bcl2a1/Bfl-1/A1, is only poorly understood because of quadruplication of its gene locus in mice, hindering conventional knockout studies. To overcome this problem, we generated mouse models allowing traceable constitutive or reversible ablation of A1 in the hematopoietic system by RNA interference. Knockdown of A1 impaired early stages of T-cell differentiation, B-cell homeostasis, and sensitized transitional as well as follicular B cells to apoptosis induced by ligation of the B-cell receptor. As a consequence, B-cell proliferation in response to mitogens was severely impaired, whereas that of T cells appeared unaffected. Furthermore, depending on the extent of A1 knockdown, granulocytes showed increased spontaneous death in culture or failed to accumulate in significant numbers in vivo. These models highlight the critical role of A1 in leukocyte development and homeostasis, constituting valuable tools for investigating presumed roles of this Bcl-2 family member in immunity, tumorigenesis, and drug resistance.
Journal of Immunology (Baltimore, Md. : 1950). Jun, 2012 | Pubmed ID: 22593614
Intracellular (clade B) OVA-serpin protease inhibitors play an important role in tissue homeostasis by protecting cells from death in response to hypo-osmotic stress, heat shock, and other stimuli. It is not known whether these serpins influence immunological tolerance and the risk for autoimmune diseases. We found that a fraction of young autoimmune diabetes-prone NOD mice had elevated levels of autoantibodies against a member of clade B family known as serpinB13. High levels of anti-serpinB13 Abs were accompanied by low levels of anti-insulin autoantibodies, reduced numbers of islet-associated T cells, and delayed onset of diabetes. Exposure to anti-serpinB13 mAb alone also decreased islet inflammation, and coadministration of this reagent and a suboptimal dose of anti-CD3 mAb accelerated recovery from diabetes. In a fashion similar to that discovered in the NOD model, a deficiency in humoral activity against serpinB13 was associated with early onset of human type 1 diabetes. These findings suggest that, in addition to limiting exposure to proteases within the cell, clade B serpins help to maintain homeostasis by inducing protective humoral immunity.
Retrospective Evaluation of Presenting Temperature of Urethral Obstructed Male Cats and the Association with Severity of Azotemia and Length of Hospitalization: 243 Cats (2006-2009)
Journal of Veterinary Emergency and Critical Care (San Antonio, Tex. : 2001). Jun, 2012 | Pubmed ID: 22612674
To evaluate whether the presenting rectal temperature and level of azotemia predicts the length of hospitalization (LOH) in a population of obstructed male cats. To describe the relationships between physical examination parameters, blood electrolytes, and azotemia in a clinical population of obstructed male cats.
PloS One. 2012 | Pubmed ID: 22615876
While numerous structural magnetic resonance imaging (MRI) studies revealed changes of brain volume or density, cortical thickness and fibre integrity in schizophrenia, the effect of tissue alterations on the contrast properties of neural structures has so far remained mostly unexplored.
The Metabolic Progression to Type 1 Diabetes As Indicated by Serial Oral Glucose Tolerance Testing in the Diabetes Prevention Trial-type 1
Diabetes. Jun, 2012 | Pubmed ID: 22618768
GATA2 Zinc Finger 1 Mutations Associated with Biallelic CEBPA Mutations Define a Unique Genetic Entity of Acute Myeloid Leukemia
Blood. Jul, 2012 | Pubmed ID: 22649106
Cytogenetically normal acute myeloid leukemia (CN-AML) with biallelic CEBPA gene mutations (biCEPBA) represents a distinct disease entity with a favorable clinical outcome. So far, it is not known whether other genetic alterations cooperate with biCEBPA mutations during leukemogenesis. To identify additional mutations, we performed whole exome sequencing of 5 biCEBPA patients and detected somatic GATA2 zinc finger 1 (ZF1) mutations in 2 of 5 cases. Both GATA2 and CEBPA are transcription factors crucial for hematopoietic development. Inherited or acquired mutations in both genes have been associated with leukemogenesis. Further mutational screening detected novel GATA2 ZF1 mutations in 13 of 33 biCEBPA-positive CN-AML patients (13/33, 39.4%). No GATA2 mutations were found in 38 CN-AML patients with a monoallelic CEBPA mutation and in 89 CN-AML patients with wild-type CEBPA status. The presence of additional GATA2 mutations (n=10) did not significantly influence the clinical outcome of 26 biCEBPA-positive patients. In reporter gene assays, all tested GATA2 ZF1 mutants showed reduced capacity to enhance CEBPA-mediated activation of transcription, suggesting that the GATA2 ZF1 mutations may collaborate with biCEPBA mutations to deregulate target genes during malignant transformation. We thus provide evidence for a genetically distinct subgroup of CN-AML. The German AML cooperative group trials 1999 and 2008 are registered with the identifiers NCT00266136 and NCT01382147 at www.clinicaltrials.gov.
Assessment of Pulmonary Melanoma Metastases with 18F-FDG PET/CT: Which PET-negative Patients Require Additional Tests for Definitive Staging?
European Radiology. Nov, 2012 | Pubmed ID: 22653282
To determine, in patients with melanoma, the dependence of PET sensitivity on pulmonary metastasis size, and to determine patients who require further evaluation for definite staging.
L-xylo-3-hexulose Reductase is the Missing Link in the Oxidoreductive Pathway for D-galactose Catabolism in Filamentous Fungi
The Journal of Biological Chemistry. Jul, 2012 | Pubmed ID: 22654107
In addition to the well established Leloir pathway for the catabolism of d-galactose in fungi, the oxidoreductive pathway has been recently identified. In this oxidoreductive pathway, D-galactose is converted via a series of NADPH-dependent reductions and NAD(+)-dependent oxidations into D-fructose. The pathway intermediates include galactitol, L-xylo-3-hexulose, and d-sorbitol. This study identified the missing link in the pathway, the L-xylo-3-hexulose reductase that catalyzes the conversion of L-xylo-3-hexulose to D-sorbitol. In Trichoderma reesei (Hypocrea jecorina) and Aspergillus niger, we identified the genes lxr4 and xhrA, respectively, that encode the l-xylo-3-hexulose reductases. The deletion of these genes resulted in no growth on galactitol and in reduced growth on D-galactose. The LXR4 was heterologously expressed, and the purified protein showed high specificity for L-xylo-3-hexulose with a K(m) = 2.0 Â± 0.5 mm and a V(max) = 5.5 Â± 1.0 units/mg. We also confirmed that the product of the LXR4 reaction is D-sorbitol.
Thromboelastometry Based Early Goal-Directed Coagulation Management Reduces Blood Transfusion Requirements, Adverse Events, and Costs in Acute Type A Aortic Dissection: A Pilot Study
Transfusion Medicine and Hemotherapy : Offizielles Organ Der Deutschen Gesellschaft Fur Transfusionsmedizin Und Immunhamatologie. Apr, 2012 | Pubmed ID: 22670130
BACKGROUND: In aortic surgery bleeding complications can be fatal. Therefore, rotational thromboelastometry(ROTEMâ„¢)-based coagulation management was introduced. METHODS: After 5 cases of acute type A aortic dissection and aortic arch replacement had been treated based on ROTEM findings (ROTEM group; RG), 5 cases without ROTEM were matched as control group (CG). CG treatment was based on conventional tests and clinical findings. Blood component and coagulation factor requirements, ventilation time, duration of stay at intensive care unit (ICU), hospitalization, and thrombotic or bleeding incidents as well as transfusion-associated costs were compared. RESULTS: Administration of blood products and coagulation factor concentrates, ventilation time, ICU length of stay, and hospitalization tended to be lower in RG. Postoperative plasma transfusion (p = 0.038), recognized incidents (p = 0.048), and resulting costs on coagulation treatment (p = 0.049) were significantly reduced. CONCLUSION: Our data suggest that ROTEM-based coagulation management can reduce transfusion requirements and corresponding costs in patients with aortic arch replacement. These data has to be confirmed by prospective randomized trials.
Long-term Oncological and Continence Outcomes After Laparoscopic Radical Prostatectomy: a Single-centre Experience
BJU International. Dec, 2012 | Pubmed ID: 22672442
Study Type--Therapy (case series) Level of Evidence 4. What's known on the subject? and What does the study add? Over the past decade, minimally invasive laparoscopic radical prostatectomy and more recently robot-assisted laparoscopic prostatectomy have been introduced and have proven equally effective compared with open surgery in terms of mid-term cancer control and complication rates. Because long-term data is lacking, open prostatectomy is still considered the 'gold standard' by some authors, who argue that minimally invasive approaches have to measure up to the excellent long-term results of open surgery. This study represents one of the largest series (1845 patients) of minimally invasive radical prostatectomy with extended follow-up (11.3 years) and detailed data on oncological outcome and postoperative incontinence. It therefore supplies previously lacking information on these details for minimally invasive prostate surgery and provides important information for patient counselling.
Cold Spring Harbor Perspectives in Medicine. Jun, 2012 | Pubmed ID: 22675665
Type 1 diabetes (T1D), also known as insulin-dependent diabetes mellitus, is a chronic disorder that results from autoimmune destruction of insulin-producing Î² cells in the islets of Langerhans within the pancreas ( Atkinson and Maclaren 1994). This disease becomes clinically apparent only after significant destruction of the Î²-cell mass, which reduces the ability to maintain glycemic control and metabolic function. In addition, it continues for years after clinical onset until, generally, there is complete destruction of insulin secretory capacity. Because prevention and therapy strategies are targeted to this pathologic process, it becomes imperative to have methods with which it can be monitored. This work discusses current research-based approaches to monitor the autoimmunity and metabolic function in T1D patients and their potential for widespread clinical application.
Fall in C-peptide During First 2 Years from Diagnosis: Evidence of at Least Two Distinct Phases from Composite Type 1 Diabetes TrialNet Data
Diabetes. Aug, 2012 | Pubmed ID: 22688329
Interpretation of clinical trials to alter the decline in Î²-cell function after diagnosis of type 1 diabetes depends on a robust understanding of the natural history of disease. Combining data from the Type 1 Diabetes TrialNet studies, we describe the natural history of Î²-cell function from shortly after diagnosis through 2 years post study randomization, assess the degree of variability between patients, and investigate factors that may be related to C-peptide preservation or loss. We found that 93% of individuals have detectable C-peptide 2 years from diagnosis. In 11% of subjects, there was no significant fall from baseline by 2 years. There was a biphasic decline in C-peptide; the C-peptide slope was -0.0245 pmol/mL/month (95% CI -0.0271 to -0.0215) through the first 12 months and -0.0079 (-0.0113 to -0.0050) from 12 to 24 months (P < 0.001). This pattern of fall in C-peptide over time has implications for understanding trial results in which effects of therapy are most pronounced early and raises the possibility that there are time-dependent differences in pathophysiology. The robust data on the C-peptide obtained under clinical trial conditions should be used in planning and interpretation of clinical trials.
RUNX1 Mutations in Cytogenetically Normal Acute Myeloid Leukemia Are Associated with a Poor Prognosis and Up-regulation of Lymphoid Genes
Haematologica. Dec, 2012 | Pubmed ID: 22689681
The RUNX1 (AML1) gene is a frequent mutational target in myelodysplastic syndromes and acute myeloid leukemia. Previous studies suggested that RUNX1 mutations may have pathological and prognostic implications.
Six Novel Susceptibility Loci for Early-onset Androgenetic Alopecia and Their Unexpected Association with Common Diseases
PLoS Genetics. May, 2012 | Pubmed ID: 22693459
Androgenetic alopecia (AGA) is a highly heritable condition and the most common form of hair loss in humans. Susceptibility loci have been described on the X chromosome and chromosome 20, but these loci explain a minority of its heritable variance. We conducted a large-scale meta-analysis of seven genome-wide association studies for early-onset AGA in 12,806 individuals of European ancestry. While replicating the two AGA loci on the X chromosome and chromosome 20, six novel susceptibility loci reached genome-wide significance (pâ€Š=â€Š2.62Ã—10â»â¹-1.01Ã—10â»Â¹Â²). Unexpectedly, we identified a risk allele at 17q21.31 that was recently associated with Parkinson's disease (PD) at a genome-wide significant level. We then tested the association between early-onset AGA and the risk of PD in a cross-sectional analysis of 568 PD cases and 7,664 controls. Early-onset AGA cases had significantly increased odds of subsequent PD (ORâ€Š=â€Š1.28, 95% confidence interval: 1.06-1.55, pâ€Š=â€Š8.9Ã—10â»Â³). Further, the AGA susceptibility alleles at the 17q21.31 locus are on the H1 haplotype, which is under negative selection in Europeans and has been linked to decreased fertility. Combining the risk alleles of six novel and two established susceptibility loci, we created a genotype risk score and tested its association with AGA in an additional sample. Individuals in the highest risk quartile of a genotype score had an approximately six-fold increased risk of early-onset AGA [odds ratio (OR)â€Š=â€Š5.78, pâ€Š=â€Š1.4Ã—10â»â¸â¸]. Our results highlight unexpected associations between early-onset AGA, Parkinson's disease, and decreased fertility, providing important insights into the pathophysiology of these conditions.
Nature Immunology. Aug, 2012 | Pubmed ID: 22706339
The innate immune system senses infection by detecting either evolutionarily conserved molecules essential for the survival of microbes or the abnormal location of molecules. Here we demonstrate the existence of a previously unknown innate detection mechanism induced by fusion between viral envelopes and target cells. Virus-cell fusion specifically stimulated a type I interferon response with expression of interferon-stimulated genes, in vivo recruitment of leukocytes and potentiation of signaling via Toll-like receptor 7 (TLR7) and TLR9. The fusion-dependent response was dependent on the stimulator of interferon genes STING but was independent of DNA, RNA and viral capsid. We suggest that membrane fusion is sensed as a danger signal with potential implications for defense against enveloped viruses and various conditions of giant-cell formation.
Der Unfallchirurg. Nov, 2012 | Pubmed ID: 22706658
Two cases of acute scaphoid fractures of the middle third with palmar comminution were treated with cancellous bone transplantation and Herbert screw fixation. Despite 6 weeks of cast immobilization, secondary loss of reduction resulted in primary grade dislocation in one patient. In the other patient scaphoid dislocation led to dorsiflexed intercalated segment instability and the need for screw removal due to secondary joint irritation. As a consequence the authors recommend the use of cortical bone grafting of the iliac crest in cases where palmar defects occur after reduction of the scaphoid.
Chirurgia (Bucharest, Romania : 1990). Mar-Apr, 2012 | Pubmed ID: 22712361
Orvosi Hetilap. Jul, 2012 | Pubmed ID: 22735371
The long-term treatment of schizophrenia is one of the most challenging tasks for practicing physicians. The most pronounced difficulty arises from the deficient compliance due to the lack of insight. Thus the treatment of schizophrenia requires a multimodal approach, which always includes psychosocial interventions beside the pharmacological treatment. The antipsychotic medication means the cornerstone in the pharmacological treatment of schizophrenia within which an increasing role of the long-acting second-generation injections can be detected. The outcome of schizophrenia can be modified by adequately organized management strategies, which in turn can lead to better quality of life and social functioning. If patients are provided with timely initiated effective medication and rehabilitation, then enduring remission can be a realistically achievable goal for the patients. Orv. Hetil., 2012, 153, 1007-1012.
Diabetes and Peripheral Arterial Occlusive Disease Impair the Cutaneous Tissue Oxygenation in Dorsal Hand Microcirculation of Elderly Adults: Implications for Hand Rejuvenation
Dermatologic Surgery : Official Publication for American Society for Dermatologic Surgery [et Al.]. Jul, 2012 | Pubmed ID: 22759249
In spite of potential implications for anti-aging therapy regarding the selection of the most suitable therapeutical method and potential perinterventional complications, cutaneous microcirculation of the aging hand in healthy individuals as well as in those with diabetes mellitus or peripheral arterial occlusive disease (PAOD) has never been evaluated.
Nonpharmacologic Approach to Minimizing Shivering During Surface Cooling: a Proof of Principle Study
Journal of Critical Care. Jul, 2012 | Pubmed ID: 22762936
This study had 2 objectives: (1) to quantify the metabolic response to physical cooling in febrile patients with systemic inflammatory response syndrome (SIRS) and (2) to provide proof for the hypothesis that the efficiency of external cooling and the subsequent shivering response are influenced by site and temperature of surface cooling pads.
Efficacy and Safety Profile of Dronedarone in Clinical Practice. Results of the Magdeburg Dronedarone Registry (MADRE Study)
International Journal of Cardiology. Jul, 2012 | Pubmed ID: 22781508
BACKGROUND: Dronedarone is a new antiarrhythmic agent that has only recently been approved for the therapy of atrial fibrillation (AF). Results regarding a broader spectrum of patients and experience accumulated in clinical practice are still very scarce. Therefore, we prospectively investigated the efficacy and tolerance of dronedarone in a real life setting. METHODS AND RESULTS: The study included 191 patients (85 women) aged 63Â±9.9years with a history of paroxysmal or persistent AF. Follow-up time was 14.3Â±4.9months. In patients with persistent AF, sinus rhythm was restored using electrical cardioversion prior to dronedarone administration. Each patient underwent standard ECG on a daily basis during the first 4days of treatment, and on days 7, 30 and 90, resp. After that, the patients had a follow-up visit every three months. Creatinine, creatine kinase, and hepatic enzymes were closely monitored. Clinical history was meticulously taken at multiple follow-up visits. Dronedarone maintained sinus rhythm in 33.5% (95% CI: 27%-40%), and AF recurrence rate was high: 66.5% (95% CI: 60%-73%). Adverse effects occurred in 31.9% (95% CI: 27%-38%) of the patients and necessitated permanent discontinuation of dronedarone in 22% (95% CI: 17%-27%). CONCLUSIONS: The results suggest that dronedarone may not be superior to available antiarrhythmic agents and caution against its use as a first line therapy in AF.
Sexually Transmitted Diseases. Aug, 2012 | Pubmed ID: 22801340
Clinical studies demonstrate increased prevalence of human papillomavirus (HPV)-associated disease in HIV-infected individuals and an increased risk of HIV acquisition in HPV-infected individuals. The mechanisms underlying this synergy are not defined. We hypothesize that women with cervical intraepithelial neoplasia (CIN) will exhibit changes in soluble mucosal immunity that may promote HPV persistence and facilitate HIV infection.
Altered Biomarkers of Mucosal Immunity and Reduced Vaginal Lactobacillus Concentrations in Sexually Active Female Adolescents
PloS One. 2012 | Pubmed ID: 22808157
Genital secretions collected from adult women exhibit in vitro activity against herpes simplex virus (HSV) and Escherichia coli (E. coli), but prior studies have not investigated this endogenous antimicrobial activity or its mediators in adolescent females.
Journal of Acquired Immune Deficiency Syndromes (1999). Oct, 2012 | Pubmed ID: 22820806
Genital tract secretions provide variable inhibitory activity against herpes simplex virus (HSV) ex vivo. We hypothesize that the anti-HSV activity may prevent the spread of virus from the more commonly affected sites, such as the external genitalia, to the upper genital tract.
The Journal of Physiology. Oct, 2012 | Pubmed ID: 22826129
The alveolo-capillary barrier is effectively impermeable to large solutes such as proteins. A hallmark of acute lung injury/acute respiratory distress syndrome is the accumulation of protein-rich oedema fluid in the distal airspaces. Excess protein must be cleared from the alveolar space for recovery; however, the mechanisms of protein clearance remain incompletely understood. In intact rabbit lungs 29.8 Â± 2.2% of the radio-labelled alveolar albumin was transported to the vascular compartment at 37Â°C within 120 min, as assessed by real-time measurement of 125I-albumin clearance from the alveolar space. At 4Â°C or 22Â°C significantly lower albumin clearance (3.7 Â± 0.4 or 16.2 Â± 1.1%, respectively) was observed. Deposition of a 1000-fold molar excess of unlabelled albumin into the alveolar space or inhibition of cytoskeletal rearrangement or clathrin-dependent endocytosis largely inhibited the transport of 125I-albumin to the vasculature, while administration of unlabelled albumin to the vascular space had no effect on albumin clearance. Furthermore, albumin uptake capacity was measured as about 0.37 mg mlâˆ’1 in cultured rat lung epithelial monolayers, further highlighting the (patho)physiological relevance of active alveolar epithelial protein transport. Moreover, gene silencing and pharmacological inhibition of the multi-ligand receptor megalin resulted in significantly decreased albumin binding and uptake in monolayers of primary alveolar type II and type I-like and cultured lung epithelial cells. Our data indicate that clearance of albumin from the distal air spaces is facilitated by an active, high-capacity, megalin-mediated transport process across the alveolar epithelium. Further understanding of this mechanism is of clinical importance, since an inability to clear excess protein from the alveolar space is associated with poor outcome in patients with acute lung injury/acute respiratory distress syndrome.
Serial 3-Dimensional Computed Tomography and a Novel Method of Volumetric Analysis for the Evaluation of the Osteo-Odonto-Keratoprosthesis
Cornea. Jul, 2012 | Pubmed ID: 22854560
PURPOSE:: To assess the use of serial computed tomography (CT) in the detection of osteo-odonto-lamina resorption in osteo-odonto-keratoprosthesis (OOKP) and to investigate the use of new volumetric software, Advanced Lung Analysis software (3D-ALA; GE Healthcare), for detecting changes in OOKP laminar volume. METHODS:: A retrospective assessment of the radiological databases and hospital records was performed for 22 OOKP patients treated at the National OOKP referral center in Brighton, United Kingdom. Three-dimensional surface reconstructions of the OOKP laminae were performed using stored CT data. For the 2-dimensional linear analysis, the linear dimensions of the reconstructed laminae were measured, compared with original measurements taken at the time of surgery, and then assigned a CT grade based on a predetermined resorption grading scale. The volumetric analysis involved calculating the laminar volumes using 3D-ALA. The effectiveness of 2-dimensional linear analysis, volumetric analysis, and clinical examination in detecting laminar resorption was compared. RESULTS:: The mean change in laminar volume between the first and second scans was -6.67% (range, +10.13% to -24.86%). CT grades assigned to patients based on laminar dimension measurements remained the same, despite significant changes in laminar volumes. Clinical examination failed to identify 60% of patients who were found to have resorption on volumetric analysis. CONCLUSIONS:: Currently, the detection of laminar resorption relies on clinical examination and the measurement of laminar dimensions on the 2- and 3-dimensional radiological images. Laminar volume measurement is a useful new addition to the armamentarium. It provides an objective tool that allows for a precise and reproducible assessment of laminar resorption.
Association of Bactericidal Activity of Genital Tract Secretions with Escherichia Coli Colonization in Pregnancy
American Journal of Obstetrics and Gynecology. Oct, 2012 | Pubmed ID: 22867687
Genital tract secretions exhibit bactericidal activity against Escherichia coli. We hypothesized that this defense may be modulated during pregnancy.
Visualization of Vascular Inflammation in the Atherosclerotic Mouse by Ultrasmall Superparamagnetic Iron Oxide Vascular Cell Adhesion Molecule-1-specific Nanoparticles
Arteriosclerosis, Thrombosis, and Vascular Biology. Oct, 2012 | Pubmed ID: 22879583
Noninvasive imaging of atherosclerosis remains challenging in clinical applications. Here, we applied noninvasive molecular imaging to detect vascular cell adhesion molecule-1 in early and advanced atherosclerotic lesions of apolipoprotein E-deficient mice.
Hemianopia and Visual Loss Due to Progressive Multifocal Leukoencephalopathy in Natalizumab-treated Multiple Sclerosis
Clinical Ophthalmology (Auckland, N.Z.). 2012 | Pubmed ID: 22888211
This case describes typical ophthalmic findings as a key feature for diagnosis of progressive multifocal leukoencephalopathy (PML) and its possible differential diagnosis. A 58-year-old female patient with relapsing-remitting multiple sclerosis on immunotherapy with natalizumab developed visual disturbance, reading problems, and visual field defects due to PML. PML is a reactivation of latent infection with the John Cunningham virus, which is a type of polyomavirus acquired in childhood or adolescence and is quite common in the general population. PML so far has been mostly associated with other immunodeficiency disorders, such as acquired immunodeficiency syndrome, but is also gaining importance in association with the increasing use and duration of treatment with natalizumab in patients suffering from multiple sclerosis. Natalizumab is a highly specific Î±4-integrin antagonist approved for treatment of patients with active relapsing-remitting multiple sclerosis.
[Laboratory Diagnostics for Early Detection of Rheumatic Autoimmune Diseases: a Guide for the General Practitioner]
Wiener Medizinische Wochenschrift (1946). Nov, 2012 | Pubmed ID: 22890524
Autoimmune diseases are a clinically heterogeneous group of disorders that represent a challenge for the general practitioner in daily routine. Except for rheumatoid arthritis, which is one of the most frequent autoimmune diseases with a prevalence of approximately 1 % of the population, systemic autoimmune disorders are rare. Thus outside specialized wards it might be a challenge to diagnose the underlying autoimmune disease considering the often kaleidoscopic clinical manifestations. Together with careful anamnesis and suspicious clinical symptoms determination of specific autoantibodies can support the suspected diagnosis. The Austrian group of the European autoimmune standardization initiative (EASI) firstly published this guide 2009 with the aim to provide a map through the jungle of the biomarkers for autoimmune diseases for the general practitioner.
Investigation of Selected Cytokine Genes Suggests That IL2RA and the TNF/LTA Locus Are Risk Factors for Severe Alopecia Areata
The British Journal of Dermatology. Dec, 2012 | Pubmed ID: 22897480
Alopecia areata (AA) is the second most common cause of hair loss in humans, and has a genetically complex inheritance. The hypothesis that AA is autoimmune in nature is supported by previous studies. These report an association with specific HLA alleles, as well as genetic variants of other genes implicated in autoimmunity, such as various cytokine genes. However, these cannot yet be considered proven susceptibility loci, as many of these association findings were derived from small patient samples.
American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons. Oct, 2012 | Pubmed ID: 22900715
Preclinical testing of human therapeutic monoclonal antibodies has been limited in murine models due to species differences in pharmacokinetics and biologic responses. To overcome these constraints we developed a murine skin transplant model in humanized mice and used it to test human monoclonal antibody therapy. Neonatal NOD/SCID/IL2RÎ³c(null) mice (NSG) were reconstituted with human CD34(+) hematopoietic stem cells (hNSG). When adult, these mice rejected MHC mismatched murine C57BL/6J skin grafts. Rejection required adequate reconstitution with human cells. There was diffuse infiltration of the epidermis and dermis with hCD8 and hCD4 cells in rejected grafts by immunohistochemistry. Studies with B6/MHC class I and II knockout mice donors indicated that neither is required for rejection. Graft rejection was associated with the development of effector and central memory T cells and an increase in serum immunoglobulins. We also tested the effects of teplizumab (anti-CD3 mAb) and found it could delay skin graft rejection, whereas ipilimumab (anti-CTLA-4 [cytotoxic T-lymphocyte antigen-4] mAb) treatment accelerated rejection. These findings demonstrate that hNSG mice reliably and predictably reject a xenogenic mouse skin graft by a human T cell mediated mechanism. The model can be utilized to investigate the ability of human immunotherapies to enhance or suppress functional human immune responses.
Expert Opinion: What Are the Greatest Challenges And/or Barriers to Applying Evidence-based Medicine in the Daily Practice of Cardiopulmonary Radiology?
Journal of Thoracic Imaging. Sep, 2012 | Pubmed ID: 22914119
Academic Medicine : Journal of the Association of American Medical Colleges. Oct, 2012 | Pubmed ID: 22914514
Although multiple independent sampling (MIS) has been adapted for admissions interviews, its application for assessing written materials in the admissions file has been limited. Currently, admissions file review at the University of Toronto medical school involves one rater per file to enable holistic assessment, which may introduce a halo effect-that is, impressions of one component influencing the evaluation of other components. The authors examined whether MIS file review, through which multiple raters evaluate specific file components independently, may reduce this effect.
Brava and Autologous Fat Transfer is a Safe and Effective Breast Augmentation Alternative: Results of a 6-year, 81-patient, Prospective Multicenter Study
Plastic and Reconstructive Surgery. Sep, 2012 | Pubmed ID: 22929274
DeloRes Trial: Study Protocol for a Randomized Trial Comparing Two Standardized Surgical Approaches in Rectal Prolapse - Delorme's Procedure Versus Resection Rectopexy
Trials. 2012 | Pubmed ID: 22931552
More than 100 surgical approaches to treat rectal prolapse have been described. These can be done through the perineum or transabdominally. Delorme's procedure is the most frequently used perineal, resection rectopexy the most commonly used abdominal procedure. Recurrences seem more common after perineal compared to abdominal techniques, but the latter may carry a higher risk of peri- and postoperative morbidity and mortality.
General Relationships Between Abiotic Soil Properties and Soil Biota Across Spatial Scales and Different Land-use Types
PloS One. 2012 | Pubmed ID: 22937029
Very few principles have been unraveled that explain the relationship between soil properties and soil biota across large spatial scales and different land-use types. Here, we seek these general relationships using data from 52 differently managed grassland and forest soils in three study regions spanning a latitudinal gradient in Germany. We hypothesize that, after extraction of variation that is explained by location and land-use type, soil properties still explain significant proportions of variation in the abundance and diversity of soil biota. If the relationships between predictors and soil organisms were analyzed individually for each predictor group, soil properties explained the highest amount of variation in soil biota abundance and diversity, followed by land-use type and sampling location. After extraction of variation that originated from location or land-use, abiotic soil properties explained significant amounts of variation in fungal, meso- and macrofauna, but not in yeast or bacterial biomass or diversity. Nitrate or nitrogen concentration and fungal biomass were positively related, but nitrate concentration was negatively related to the abundances of Collembola and mites and to the myriapod species richness across a range of forest and grassland soils. The species richness of earthworms was positively correlated with clay content of soils independent of sample location and land-use type. Our study indicates that after accounting for heterogeneity resulting from large scale differences among sampling locations and land-use types, soil properties still explain significant proportions of variation in fungal and soil fauna abundance or diversity. However, soil biota was also related to processes that act at larger spatial scales and bacteria or soil yeasts only showed weak relationships to soil properties. We therefore argue that more general relationships between soil properties and soil biota can only be derived from future studies that consider larger spatial scales and different land-use types.
The BH3-only Proteins Bim and Puma Cooperate to Impose Deletional Tolerance of Organ-specific Antigens
Immunity. Sep, 2012 | Pubmed ID: 22960223
Although the proapoptotic BH3-only protein, Bim, is required for deletion of autoreactive thymocytes, Bim-deficient mice do not succumb to extensive organ-specific autoimmune disease. To determine whether other BH3-only proteins safeguard tolerance in the absence of Bim, we screened mice lacking Bim as well as other BH3-only proteins. Most strains showed no additional defects; however, mice deficient for both Puma and Bim spontaneously developed autoimmunity in multiple organs, and their TÂ cells could transfer organ-specific autoimmunity. Puma- and Bim-double-deficient mice had a striking accumulation of mature, single-positive thymocytes, suggesting an additional defect in thymic deletion was the basis for disease. Transgenic mouse models of thymocyte deletion by peripheral neoantigens confirmed that the loss of Bim and Puma allowed increased numbers of autoreactive thymocytes to escape deletion. Our data show that Puma cooperates with Bim to impose a thymic-deletion checkpoint to peripheral self-antigens and cement the notion that defects in apoptosis alone are sufficient to cause autoimmune disease.
Mucosal Escherichia Coli Bactericidal Activity and Immune Mediators Are Associated with HIV-1 Seroconversion in Women Participating in the HPTN 035 Trial
The Journal of Infectious Diseases. Dec, 2012 | Pubmed ID: 22966121
The mucosal environment may impact the risk for human immunodeficiency virus type 1 (HIV-1) acquisition. Immune mediators were measured in vaginal fluid collected from HPTN 035 participants who acquired HIV-1 and from those who remained HIV-1 negative (controls). Mediator concentrations were similar in samples obtained before as compared to after HIV-1 acquisition in the 8 seroconverters. Compared with controls, seroconverters were more likely to have detectable levels of HÎ²D-2 (odds ratio [OR], 2.39; PÂ =Â .005) and greater Escherichia coli bactericidal activity (OR, 1.22; PÂ =Â .01) prior to seroconversion. E. coli bactericidal activity remained significant in a multivariable analysis (PÂ =Â .02) and may be a biomarker for HIV-1 acquisition.
AIDS Research and Human Retroviruses. Nov, 2012 | Pubmed ID: 22966871
In the past few years, the transdisciplinary field of HIV prevention has reached several milestones. Topically applied tenofovir gel provided significant protection from sexual transmission of HIV in a large-scale clinical trial and oral Truvada (emtricitabine/tenofovir disoproxil fumarate) was recently approved for preexposure prophylaxis (PrEP) following two successful clinical trials in men and women. These achievements are tempered by the disappointing results of other clinical trials, which highlight the complexities of prevention research. In this perspective, we discuss scientific and developmental gaps for topical chemoprophylaxis of the sexual transmission of HIV, which depends on the complex interactions between the pharmacokinetics and pharmacodynamics of drugs, formulation and delivery systems, anatomic site of transmission, and host mucosal immune defenses. Despite the considerable time and resources devoted to unraveling the initial steps in sexual transmission of HIV, current knowledge is based on animal models and human explanted tissue, which may not fully recapitulate what happens clinically. Understanding these events, including the role that sex hormones, semen, and mucosal secretions play in transmission, and the interplay between innate immunity, the mucosal environment, and drug efficacy is paramount. This drives some of the most pressing questions in the field.
PloS One. 2012 | Pubmed ID: 22970135
The key factors which support re-expansion of beta cell numbers after injury are largely unknown. Insulin-like growth factor II (IGF-II) plays a critical role in supporting cell division and differentiation during ontogeny but its role in the adult is not known. In this study we investigated the effect of IGF-II on beta cell regeneration.
BMC Bioinformatics. 2012 | Pubmed ID: 22971100
Meta-analysis (MA) is widely used to pool genome-wide association studies (GWASes) in order to a) increase the power to detect strong or weak genotype effects or b) as a result verification method. As a consequence of differing SNP panels among genotyping chips, imputation is the method of choice within GWAS consortia to avoid losing too many SNPs in a MA. YAMAS (Yet Another Meta Analysis Software), however, enables cross-GWAS conclusions prior to finished and polished imputation runs, which eventually are time-consuming.
The Effect of Labeling Photo Documents in Wrist Arthroscopies on Intra- and Interobserver Reliability
Archives of Orthopaedic and Trauma Surgery. Dec, 2012 | Pubmed ID: 22983095
The reproducibility of diagnoses based on photo documents in wrist arthroscopies is limited and is expected to improve if the photos are labeled with illustrated structures.
Gore BioA Fistula Plug in the Treatment of High Anal Fistulas--initial Results from a German Multicenter-study
German Medical Science : GMS E-journal. 2012 | Pubmed ID: 22984363
Treatment of high anal fistulas may be associated with a high risk of continence disorders. Beside traditional procedure of flap-reconstruction the occlusion of the fistula tract using fistula-plugs offers a new sphincter-saving treatment option. In this study for the first time results from Germany are described.
The Journal of Clinical Investigation. Oct, 2012 | Pubmed ID: 22996662
Influenza viruses (IVs) cause pneumonia in humans with progression to lung failure. Pulmonary DCs are key players in the antiviral immune response, which is crucial to restore alveolar barrier function. The mechanisms of expansion and activation of pulmonary DC populations in lung infection remain widely elusive. Using mouse BM chimeric and cell-specific depletion approaches, we demonstrated that alveolar epithelial cell (AEC) GM-CSF mediates recovery from IV-induced injury by affecting lung DC function. Epithelial GM-CSF induced the recruitment of CD11b+ and monocyte-derived DCs. GM-CSF was also required for the presence of CD103+ DCs in the lung parenchyma at baseline and for their sufficient activation and migration to the draining mediastinal lymph nodes (MLNs) during IV infection. These activated CD103+ DCs were indispensable for sufficient clearance of IVs by CD8+ T cells and for recovery from IV-induced lung injury. Moreover, GM-CSF applied intratracheally activated CD103+ DCs, inducing increased migration to MLNs, enhanced viral clearance, and attenuated lung injury. Together, our data reveal that GM-CSF-dependent cross-talk between IV-infected AECs and CD103+ DCs is crucial for effective viral clearance and recovery from injury, which has potential implications for GM-CSF treatment in severe IV pneumonia.
Application of in Vivo Metabolomics to Preclinical/toxicological Studies: Case Study on Phenytoin-induced Systemic Toxicity
Bioanalysis. Sep, 2012 | Pubmed ID: 23046269
BASF and Metanomics have built-up the database MetaMap(Â®)-Tox containing rat plasma metabolome data for more than 500 reference compounds. Phenytoin was administered to five Wistar rats of both sexes at dietary dose levels of 600 and 2400 ppm over 28 days and metabolome analysis was performed on days 7, 14 and 28. Clinical pathology did not indicate clear evidence for liver toxicity, whereas liver histopathology revealed slight centrilobular hepatocellular hypertrophy. The metabolome analysis of phenytoin shows metabolome changes at both dose levels and the comparison with MetaMap-Tox indicated strong evidence for liver enzyme induction, as well as liver toxicity. Moreover, evidence for kidney and indirect thyroid effects were observed. This assessment was based on the metabolite changes induced, similarities to specific toxicity patterns and the whole metabolome correlation within MetaMap-Tox. As compared with the classical read-out, a more comprehensive picture of phenytoin's effects is obtained from the metabolome analysis, demonstrating the added value of metabolome data in preclinical/ toxicological studies.
Phase I Randomized Safety Study of Twice Daily Dosing of Acidform Vaginal Gel: Candidate Antimicrobial Contraceptive
PloS One. 2012 | Pubmed ID: 23056520
Acidform gel, an acid-buffering product that inactivates spermatozoa, may be an effective topical non-hormonal contraceptive. This study was designed to evaluate the safety of vaginal dosing and effects of Acidform on mucosal immune mediators, antimicrobial properties of genital secretions, and vaginal microbiota.
Blood Lead Concentration Is Not Altered by High Dose Vitamin D Supplementation in Children and Young Adults with HIV
Journal of Pediatric Gastroenterology and Nutrition. Oct, 2012 | Pubmed ID: 23059649
OBJECTIVES:: Optimal vitamin D status is known to have beneficial health effects and vitamin D supplements are commonly used. It has been suggested that vitamin D supplementation may increase blood lead in children and adults with previous lead exposure. The objective was to determine the safety regarding lead toxicity during 12 weeks of high dose vitamin D3 supplementation in children and young adults with HIV. METHODS:: Subjects with HIV (age 8 to 24 yrs) were randomized to vitamin D3 supplementation of 4000â€ŠIU/day or 7000â€ŠIU/day and followed at 6 and 12 weeks for changes in 25D and whole blood lead concentration. This was a secondary analysis of a larger study of vitamin D3 supplementation in children and adolescents with HIV. RESULTS:: In 44 subjects (75% African American), the baseline meanâ€ŠÂ±â€ŠSD serum 25D was 48.3â€ŠÂ±â€Š18.6â€Šnmol/L. 50% of subjects had baseline serum 25D < 50.0â€Šnmol/L. Serum 25D increased significantly with D3 supplementation over the 12 weeks. No subject had a whole blood lead >5.0â€ŠÎ¼g/dL at baseline or during subsequent visits. Whole blood lead and 25D were not correlated at baseline, and were negatively correlated after 12 weeks of supplementation (pâ€Š=â€Š0.014). Whole blood lead did not differ between those receiving 4000 IU versus 7000 IU of vitamin D3. CONCLUSION:: High dose vitamin D3 supplementation and the concomitant increased serum 25D did not result in increased whole blood lead concentration in this sample of children and young adults living in a northeastern urban city.
Der Radiologe. Oct, 2012 | Pubmed ID: 23064815
Relapsing and Remitting Severe Hypoglycemia Due to a Monoclonal Anti-insulin Antibody Heralding a Case of Multiple Myeloma
The Journal of Clinical Endocrinology and Metabolism. Dec, 2012 | Pubmed ID: 23074233
We report a novel case of insulin autoimmune syndrome (IAS) presenting with hypoglycemia due to production of a monoclonal anti-insulin antibody in a patient subsequently found to have multiple myeloma (MM).
Metabolic Engineering of Inducer Formation for Cellulase and Hemicellulase Gene Expression in Trichoderma Reesei
Sub-cellular Biochemistry. 2012 | Pubmed ID: 23080260
The filamentous fungus T. reeseiis today a paradigm for the commercial scale production of different plant cell wall degrading enzymes mainly cellulases and hemicellulases. Its enzymes have a long history of safe use in industry and well established applications are found within the pulp, paper, food, feed or textile processing industries. However, when these enzymes are to be used for the saccharification of cellulosic plant biomass to simple sugars which can be further converted to biofuels or other biorefinery products, and thus compete with chemicals produced from fossil sources, additional efforts are needed to reduce costs and maximize yield and efficiency of the produced enzyme mixtures. One approach to this end is the use of genetic engineering to manipulate the biochemical and regulatory pathways that operate during enzyme production and control enzyme yield. This review aims at a description of the state of art in this area.
Language and Speech. Sep, 2012 | Pubmed ID: 23094322
Prosody plays a variety of roles in infants' communicative development, aiding in attention modulation, speech segmentation, and syntax acquisition. This study investigates the extent to which parents also spontaneously modulate prosodic aspects of infant directed speech in ways that distinguish semantic aspects of language. Fourteen mothers of two-year-old children read a picture book to their children in which they labeled pictures using dimensional adjectives (e.g., big, small, hot, cold). Recordings of the mothers' input to their children were analyzed acoustically and antonyms within each dimension were compared. Mothers modulated aspects of their prosody including amplitude and duration of target words and sentences to distinguish dimensional adjectives. Mothers appear to recruit prosody in the service of word learning.
Reproducibility and Robustness of Metabolome Analysis in Rat Plasma of 28-day Repeated Dose Toxicity Studies
Toxicology Letters. Nov, 2012 | Pubmed ID: 23103988
BASF has developed a rat plasma metabolomics database (MetaMapÂ®Tox) containing the metabolome of more than 500 chemicals, agrochemicals and drugs, for which the toxicity is well known, derived from 28-day repeated dose toxicity studies in rats. The quality/reproducibility of data was assessed by comparing the metabolome of 16 reference compounds tested at least twice under identical experimental conditions at three time points (day 7, day 14 and day 28). Statistical correlation analysis showed that the repeated treatment induced very similar changes to the metabolome. For all repetitions the modes of action of the compounds were always correctly identified. Moreover, when compared against the metabolome of all compounds available in the MetaMapÂ®Tox database, the repetitions showed in most cases the highest degree of overall similarity with the metabolome of the original study. In addition, we also evaluated the robustness of our metabolomics technique, displayed by constancy of variability in control groups over time. Based on these results, it can be concluded, that metabolomics can reproducibly be applied during toxicological in vivo testing in rats under the conditions applied here.
American Journal of Transplantation : Official Journal of the American Society of Transplantation and the American Society of Transplant Surgeons. Nov, 2012 | Pubmed ID: 23107269
Der Chirurg; Zeitschrift FÃ¼r Alle Gebiete Der Operativen Medizen. Dec, 2012 | Pubmed ID: 23111542
Haemorrhoidal disease is one of the most common diseases in general and will in most cases progress without therapy. In the therapeutic context the means of choice are conservative therapies and in the advanced stage of the disease operative measures are necessary. In Germany 40,000-50,000 operations are performed each year. Our aim with the currently available various operation techniques is individualized therapy and indications. Thus a high healing rate, low complication rate and high patient satisfaction can be achieved.
Expert Review of Clinical Pharmacology. Sep, 2012 | Pubmed ID: 23121268
Perception of Affective Prosody in Patients at an Early Stage of Relapsing-remitting Multiple Sclerosis
Journal of Neuropsychology. Nov, 2012 | Pubmed ID: 23126275
Cognitive dysfunction is well known in patients suffering from multiple sclerosis (MS) and has been described for many years. Cognitive impairment, memory, and attention deficits seem to be features of advanced MS stages, whereas depression and emotional instability already occur in early stages of the disease. However, little is known about processing of affective prosody in patients in early stages of relapsing-remitting MS (RRMS). In this study, tests assessing attention, memory, and processing of affective prosody were administered to 25 adult patients with a diagnosis of RRMS at an early stage and to 25 healthy controls (HC). Early stages of the disease were defined as being diagnosed with RRMS in the last 2Â years and having an Expanded Disability Status Scale (EDSS) of 2 or lower. Patients and HC were comparable in intelligence quotient (IQ), educational level, age, handedness, and gender. Patients with early stages of RRMS performed below the control group with respect to the subtests 'discrimination of affective prosody' and 'matching of affective prosody to facial expression' for the emotion 'angry' of the 'TÃ¼bingen Affect Battery'. These deficits were not related to executive performance. Our findings suggest that emotional prosody comprehension is deficient in young patients with early stages of RRMS. Deficits in discriminating affective prosody early in the disease may make misunderstandings and poor communication more likely. This might negatively influence interpersonal relationships and quality of life in patients with RRMS.
Psychiatry Research. Nov, 2012 | Pubmed ID: 23158776
Although autobiographical memory (AM) deficits and hippocampal changes are frequently found in schizophrenia, their actual association remained yet to be established. AM performance and hippocampal volume were examined in 33 older, chronic schizophrenic patients and 21 healthy volunteers matched for age, gender and education. Psychopathological symptoms and additional neuropsychological parameters were assessed by using appropriate rating scales; magnetic resonance imaging (MRI) 3-T data were analyzed via an automated region-of-interest procedure. When compared with the control subjects, patients showed significantly decreased left anterior and posterior hippocampal volumes. Episodic but not semantic AM performance was significantly (P<0.05) lower in the patients than in the healthy controls. Both episodic and semantic AM deficits were significantly correlated with volume of the left hippocampus in the patient group. In contrast, deficits in verbal memory, working memory and remote semantic memory observed in the patients did not relate to hippocampal volume. Our findings indicate that AM deficits in chronic schizophrenia are associated with hippocampal volume reductions and underline the importance of this pathology in schizophrenia.
American Journal of Reproductive Immunology (New York, N.Y. : 1989). Nov, 2012 | Pubmed ID: 23176128
The risk of male to female transmission of HIV is impacted by baseline inflammation in the female genital tract, semen viral load and seminal plasma's ability to induce specific patterns of cervical cytokine signalling and influx of immune cell populations. Disruption of the epithelial barrier during non-consensual intercourse may trigger further inflammation and initiation of cell-signalling pathways, thus facilitating transmission of HIV and expansion of local infection. Adolescent and pregnant women are at high risk for sexual violence and may exhibit alterations of genital mucosal immunity that promote immune activation, making them uniquely vulnerable to HIV acquisition.
Lactobacillus Proteins Are Associated with the Bactericidal Activity Against E. Coli of Female Genital Tract Secretions
PloS One. 2012 | Pubmed ID: 23185346
Female genital tract secretions are bactericidal for Escherichia (E.) coli ex vivo. However, the intersubject variability and molecules that contribute to this activity have not been defined.
High Expression of MZB1 Predicts Adverse Prognosis in Chronic Lymphocytic Leukemia, Follicular Lymphoma and Diffuse Large B-cell Lymphoma and is Associated with a Unique Gene Expression Signature
Leukemia & Lymphoma. Dec, 2012 | Pubmed ID: 23189934
We recently identified the marginal zone B and B1 cell-specific protein (MZB1) as part of a gene expression signature associated with outcomes in chronic lymphocytic leukemia (CLL). MZB1 is important for B cell function as a key regulator of antibody secretion, calcium homeostasis and adhesion. Therefore, we analyzed the role of MZB1 expression levels in 139 patients with CLL using quantitative real-time polymerase chain reaction (qRT-PCR) and microarray data sets in CLL, follicular lymphoma (FL), diffuse large B-cell lymphoma (DLBCL), multiple myeloma (MM) and acute myeloid leukemia (AML). High MZB1 expression was associated with inferior survival in CLL (hazard ratio [HR]: 1.63 [confidence interval (CI): 1.14-2.33], p = 0.007), FL (221286_s_at HR: 1.16 [CI: 0.98-1.37], p = 0.086; 223565_at: HR: 1.3 [CI: 1.1-1.61], p = 0.015) and DLBCL (221286_s_at: HR: 1.17 [CI: 1.06-1.3], p = 0.003; 223565_at: HR: 1.21 [CI: 1.08-1.35], p = 0.001). In DLBCL MZB1 expression was an additive prognostic marker in a multivariate model including activated B-cell like (ABC) versus germinal center (GCB) subtype. Additionally, MZB1 expression correlated with a unique gene expression pattern. This study is the first to show that the expression level of a single gene has prognostic significance in different lymphoma subtypes. Due to its biological function, MZB1 may play a central role in B cell neoplasms and is a potential target for future therapeutic interventions.
Clinical Neurology and Neurosurgery. Nov, 2012 | Pubmed ID: 23199520
INTRODUCTION: Early after having been diagnosed with relapsing remitting multiple sclerosis (RRMS), young patients coping with the new situation require good social support and interactions. Successful social interaction is critically dependent upon the ability to understand the minds of others and their feelings. Social cognition refers to the ability to understand the mind of others. Theory of mind (ToM) defines the capability to reason about mental states of others. Empathy describes the ability to have insight into emotional stages and feelings of others. Despite the knowledge of cognitive impairment, which can have profound effects on patients daily activities and quality of life in advanced stages of multiple sclerosis, little is known concerning social cognition in early stages of RRMS. METHODS: In this analysis, tests assessing executive functions (working memory, set shifting and inhibition) and instruments measuring theory of mind (the Movie for the Assessment of Social Cognition - MASC) and empathy (Baron-Cohen's Empathy Quotient) were administered to 25 young adult patients at an early stage of RRMS and to 25 healthy controls (HC). Patients and HC were carefully matched according to intellectual level, age, gender, handedness and education. An early stage of the disease was defined as being diagnosed with RRMS in the last 2 years and having an EDSS of 2 or lower. RESULTS: Patients had significantly more incorrect responses ("missing") ToM (P<0.04). Moreover, patients showed a significantly lower level of empathy in the self-rating questionnaire (P<0.02). Of the cognitive tests and depression, ToM and Empathy Quotient (EQ) scores were only significantly correlated with the interference score of the stroop test. CONCLUSIONS: Our findings suggest that theory of mind and empathy are deficient even at early stages of RRMS. Deficits in theory of mind and empathy might negatively influence interpersonal relationships in patients with RRMS.
Anticancer Research. Dec, 2012 | Pubmed ID: 23225425
Histone deacetylase (HDAC) inhibitors are promising antitumoral drugs. Currently there are no data regarding the comparison of different HDAC inhibitors on hepatoma cells.
Radiology. Dec, 2012 | Pubmed ID: 23238153
Purpose:To retrospectively assess the detection rate for intracranial hematomas achieved with use of curved maximum intensity projections (MIPs) that parallel the inner table of the skull compared with the rate achieved by reading transverse sections of computed tomography (CT) only.Materials and Methods:This retrospective study was approved by the institutional review board, which waived informed consent. A total of 314 consecutive patients who underwent CT for cranial trauma (155 male, 159 female; mean age Â± standard deviation, 58 years Â± 24 [range, 2-98 years]) were included. The algorithm unfolded the meningeal spaces into four images per patient. Four radiologists independently evaluated all cases. Hematomas less than 3 mm thick were considered thin. Radiologists were blinded to patient names, and patient and group orders were randomly assigned. The results were compared with a reference standard built by two experts. Logistic regression with repeated measurements was used for statistical analysis.Results:Use of the reference standard helped confirm 121 intracranial hematomas in 39 patients. For all readers, reading time for hematoma detection was significantly shorter (3-5 times shorter, P < .001) for curved MIPs. Mean lesion-based detection rate for all readers was 80% (193 of 242) for transverse sections and 83% (200 of 242) for curved MIPs. For thin hematomas, the mean detection rate increased from 20% (eight of 40) with transverse sections to 83% (33 of 40) with curved MIPs.Conclusion:Curved MIPs of the meningeal spaces may shorten detection time for epidural and subdural hematomas, increase sensitivity (especially for thin hematomas), and reduce the required operator experience for detection.Â© RSNA, 2013.
CT Protocols in Interstitial Lung Diseases-A Survey Among Members of the European Society of Thoracic Imaging and a Review of the Literature
European Radiology. Dec, 2012 | Pubmed ID: 23239063
PURPOSE: The aim of this study was to survey the current CT protocols used by members of the European Society of Thoracic Imaging (ESTI) to evaluate patients with interstitial lung diseases (ILD). METHODS: A questionnaire was e-mailed to 173 ESTI members. The survey focussed on CT acquisition and reconstruction techniques. In particular, questions referred to the use of discontinuous HRCT or volume CT protocols, the acquisition of additional acquisitions in expiration or in the prone position, and methods of radiation dose reduction and on reconstruction algorithms. RESULTS: The overall response rate was 37Â %. Eighty-five percent of the respondents used either volume CT alone or in combination with discontinuous HRCT. Forty-five percent of the respondents adapt their CT protocols to the patient's weight and/or age. Expiratory CT or CT in the prone position was performed by 58Â % and 59Â % of the respondents, respectively. The number of reconstructed series ranged from two to eight. CONCLUSION: Our survey showed that radiologists with a special interest and experience in chest radiology use a variety of CT protocols for the evaluation of ILD. There is a clear preference for volumetric scans and a strong tendency to use the 3D information. KEY POINTS: â€¢ Experienced thoracic radiologists use various CT protocols for evaluating interstitial lung diseases. â€¢ Most workers prefer volumetric CT acquisitions, making use of the 3D information â€¢ More attention to reducing the radiation dose appears to be needed.
Clinical and Translational Science. Dec, 2012 | Pubmed ID: 23253663
German Medical Science : GMS E-journal. 2012 | Pubmed ID: 23255878
Background: Rectovaginal fistulas are rare, and the majority is of traumatic origin. The most common causes are obstetric trauma, local infection, and rectal surgery. This guideline does not cover rectovaginal fistulas that are caused by chronic inflammatory bowel disease.Methods: A systematic review of the literature was undertaken. Results: Rectovaginal fistula is diagnosed on the basis of the patient history and the clinical examination. Other pathologies should be ruled out by endoscopy, endosonography or tomography. The assessment of sphincter function is valuable for surgical planning (potential simultaneous sphincter reconstruction).Persistent rectovaginal fistulas generally require surgical treatment. Various surgical procedures have been described. The most common procedure involves a transrectal approach with endorectal suture. The transperineal approach is primarily used in case of simultaneous sphincter reconstruction. In recurrent fistulas. Closure can be achieved by the interposition of autologous tissue (Martius flap, gracilis muscle) or biologically degradable materials. In higher fistulas, abdominal approaches are used as well. Stoma creation is more frequently required in rectovaginal fistulas than in anal fistulas. The decision regarding stoma creation should be primarily based on the extent of the local defect and the resulting burden on the patient.Conclusion: In this clinical S3-Guideline, instructions for diagnosis and treatment of rectovaginal fistulas are described for the first time in Germany. Given the low evidence level, this guideline is to be considered of descriptive character only. Recommendations for diagnostics and treatment are primarily based the clinical experience of the guideline group and cannot be fully supported by the literature.
Sensors (Basel, Switzerland). 2012 | Pubmed ID: 23344371
Monitoring tropical deforestation and forest degradation is one of the central elements for the Reduced Emissions from Deforestation and Forest Degradation in developing countries (REDD+) scheme. Current arrangements for monitoring are based on remote sensing and field measurements. Since monitoring is the periodic process of assessing forest stands properties with respect to reference data, adopting the current REDD+ requirements for implementing monitoring at national levels is a challenging task. Recently, the advancement in Information and Communications Technologies (ICT) and mobile devices has enabled local communities to monitor their forest in a basic resource setting such as no or slow internet connection link, limited power supply, etc. Despite the potential, the use of mobile device system for community based monitoring (CBM) is still exceptional and faces implementation challenges. This paper presents an integrated data collection system based on mobile devices that streamlines the community-based forest monitoring data collection, transmission and visualization process. This paper also assesses the accuracy and reliability of CBM data and proposes a way to fit them into national REDD+ Monitoring, Reporting and Verification (MRV) scheme. The system performance is evaluated at Tra Bui commune, Quang Nam province, Central Vietnam, where forest carbon and change activities were tracked. The results show that the local community is able to provide data with accuracy comparable to expert measurements (index of agreement greater than 0.88), but against lower costs. Furthermore, the results confirm that communities are more effective to monitor small scale forest degradation due to subsistence fuel wood collection and selective logging, than high resolution remote sensing SPOT imagery.
Gene Expression Analysis in Biomarker Research and Early Drug Development Using Function Tested Reverse Transcription Quantitative Real-time PCR Assays
Methods (San Diego, Calif.). Jan, 2013 | Pubmed ID: 22796720
The identification of new biomarkers is essential in the implementation of personalized health care strategies that offer new therapeutic approaches with optimized and individualized treatment. In support of hypothesis generation and testing in the course of our biomarker research an online portal and respective function-tested reverse transcription quantitative real-time PCR assays (RT-qPCR) facilitated the selection of relevant biomarker genes. We have established workflows applicable for convenient high throughput gene expression analysis in biomarker research with cell lines (in vitro studies) and xenograft mouse models (in vivo studies) as well as formalin-fixed paraffin-embedded tissue (FFPET) sections from various human research and clinical tumor samples. Out of 92 putative biomarker candidate genes selected in silico, 35 were shown to exhibit differential expression in various tumor cell lines. These were further analysed by in vivo xenograft mouse models, which identified 13 candidate genes including potential response prediction biomarkers and a potential pharmacodynamic biomarker. Six of these candidate genes were selected for further evaluation in FFPET samples, where optimized RNA isolation, reverse transcription and qPCR assays provided reliable determination of relative expression levels as precondition for differential gene expression analysis of FFPET samples derived from projected clinical studies. Thus, we successfully applied function tested RT-qPCR assays in our biomarker research for hypothesis generation with in vitro and in vivo models as well as for hypothesis testing with human FFPET samples. Hence, appropriate function-tested RT-qPCR assays are available in biomarker research accompanying the different stages of drug development, starting from target identification up to early clinical development. The workflow presented here supports the identification and validation of new biomarkers and may lead to advances in efforts to achieve the goal of personalized health care.
Recommendations for the Management of Subsolid Pulmonary Nodules Detected at CT: A Statement from the Fleischner Society
Radiology. Jan, 2013 | Pubmed ID: 23070270
This report is to complement the original Fleischner Society recommendations for incidentally detected solid nodules by proposing a set of recommendations specifically aimed at subsolid nodules. The development of a standardized approach to the interpretation and management of subsolid nodules remains critically important given that peripheral adenocarcinomas represent the most common type of lung cancer, with evidence of increasing frequency. Following an initial consideration of appropriate terminology to describe subsolid nodules and a brief review of the new classification system for peripheral lung adenocarcinomas sponsored by the International Association for the Study of Lung Cancer (IASLC), American Thoracic Society (ATS), and European Respiratory Society (ERS), six specific recommendations were made, three with regard to solitary subsolid nodules and three with regard to multiple subsolid nodules. Each recommendation is followed first by the rationales underlying the recommendation and then by specific pertinent remarks. Finally, issues for which future research is needed are discussed. The recommendations are the result of careful review of the literature now available regarding subsolid nodules. Given the complexity of these lesions, the current recommendations are more varied than the original Fleischner Society guidelines for solid nodules. It cannot be overemphasized that these guidelines must be interpreted in light of an individual's clinical history. Given the frequency with which subsolid nodules are encountered in daily clinical practice, and notwithstanding continuing controversy on many of these issues, it is anticipated that further refinements and modifications to these recommendations will be forthcoming as information continues to emerge from ongoing research. Â© RSNA, 2012.
Teplizumab Treatment May Improve C-peptide Responses in Participants with Type 1 Diabetes After the New-onset Period: a Randomised Controlled Trial
Diabetologia. Feb, 2013 | Pubmed ID: 23086558
Type 1 diabetes results from a chronic autoimmune process continuing for years after presentation. We tested whether treatment with teplizumab (a Fc receptor non-binding anti-CD3 monoclonal antibody), after the new-onset period, affects the decline in C-peptide production in individuals with type 1 diabetes.
Early Start of the Dangling Procedure in Lower Extremity Free Flap Reconstruction Does Not Affect the Clinical Outcome
Journal of Reconstructive Microsurgery. Jan, 2013 | Pubmed ID: 23093468
Flap loss due to postoperative flap edema and thrombosis of the anastomosis remains the predominant concern of reconstructive microsurgeons. Due to the lack of scientific evidence, there is no unanimous opinion on when to mobilize a reconstructed lower extremity, reflecting the uncertainty of plastic surgeons regarding the effect of the dangling procedure on flap microcirculation.Patients and Methodsâ€ƒIn this randomized controlled clinical trial, we included 31 patients undergoing free flap transfer to the lower extremity.The patients were randomly divided into two groups. Cohort I consisted of 15 patients starting the dangling procedure at day 7, and cohort II consisted of 16 patients in which an early aggressive postoperative dependency started at day 3.Wrapping and dangling of the flap was performed primarily with a duration of 5 minutes three times a day and increased daily by doubling the duration over a period of 4 days, reaching 60 minutes at day 5.Before and immediately after each dangling procedure the flaps were clinically monitored under direct observation for color, capillary refill, venous congestion, flap turgor, and flap temperature.Resultsâ€ƒIn all cases the postoperative course was uneventful, resulting in a success rate of 100%. No adverse effects or flap compromise were seen due to the combined dangling/wrapping procedure.Conclusionâ€ƒAn early and aggressive start of a combined dangling/wrapping procedure does not compromise flap circulation and allows mobilizing patients after free flap transfer to the lower extremity at an early stage. This approach improves patient comfort, shortens the hospital stay, and therefore reduces socioeconomic costs.
Treatment with a Potassium-iron-phosphate-citrate Complex Improves PSE Scores and Quality of Life in Patients with Minimal Hepatic Encephalopathy: a Multicenter, Randomized, Placebo-controlled, Double-blind Clinical Trial
European Journal of Gastroenterology & Hepatology. Mar, 2013 | Pubmed ID: 23117470
Minimal hepatic encephalopathy (MHE) is one of the possible complications of liver cirrhosis. In this study, a potassium-iron-phosphate-citrate complex was analyzed for its efficacy and safety in the treatment of MHE, as this complex is supposed to bind to the major pathogenic factor of MHE: intestinal ammonia.
Herpes Simplex Virus 2 (HSV-2) Prevents Dendritic Cell Maturation, Induces Apoptosis, and Triggers Release of Proinflammatory Cytokines: Potential Links to HSV-HIV Synergy
Journal of Virology. Feb, 2013 | Pubmed ID: 23152529
Herpes simplex virus 2 (HSV-2) may cause frequent recurrences, highlighting its ability to evade host defense. This study tested the hypothesis that HSV-2 interferes with dendritic cell (DC) function as an escape mechanism, which may contribute to enhanced HIV replication in coinfected populations. Immature monocyte-derived human DCs were exposed to live or UV-inactivated HSV-2 or lipopolysaccharide. Little or no increase in the maturation marker CD83 was observed in response to HSV-2 and HSV-2 exposed DCs were impaired in their ability to present antigen (influenza) to T cells. Exposure to UV-inactivated virus stimulated a modest, but significant increase in CD83, suggesting that viral gene expression contributes to the block in DC maturation. The functional impairment of HSV-2-exposed DCs could be partially attributed to the induction of apoptosis. Live and inactivated HSV-2 triggered an increase in the number of early and late apoptotic cells in both the infected and bystander cell populations; apoptosis was associated with a decrease in cellular FLICE-inhibitory protein (c-FLIP). Paradoxically, HSV-2 induced Akt phosphorylation, which typically promotes DC maturation and survival. Despite these aberrant responses, live and inactivated HSV-2 induced the release of cytokines into culture supernatants, which were sufficient to activate HIV-1 replication in latently infected U1 cells. Together, these findings suggest that in the presence of overt or subclinical HSV-2, the function of mucosal DCs would be impaired. These responses may allow HSV to escape immune surveillance but may also promote HIV infection and contribute to the epidemiological link between HIV and HSV.
Dosage Finding for Low-dose Spinal Anaesthesia Using Hyperbaric Prilocaine in Patients Undergoing Perianal Outpatient Surgery
Acta Anaesthesiologica Scandinavica. Feb, 2013 | Pubmed ID: 23199005
Hyperbaric prilocaine 20â€‰mg/ml may be preferable for perianal outpatient surgery. The aim of this prospective, single-centre, randomised, single-blinded, controlled clinical trial was to determine the optimal dosage of hyperbaric prilocaine 20â€‰mg/ml for a spinal anaesthesia (SPA) in patients undergoing perianal outpatient surgery.
Patients with Arthritis Undergoing Surgery: How Should We Manage Tumour Necrosis Factor Blocking Agents Perioperatively?-A Systematic Literature Review
Yonsei Medical Journal. Jan, 2013 | Pubmed ID: 23225828
We systematically reviewed the literature on the infectious risk in patients treated with tumour necrosis factor blocking agents (TNF-BA) undergoing surgery: we searched the Medline (PubMed) and the online archive from the Annual European Congress of Rheumatology and the Annual Scientific Meeting of the American College of Rheumatology. Of total 1259 reports, 14 were finally analysed. With one exception all were retrospective. Four of 6 studies compared patients on TNF-BA with those not receiving TNF-BA, and found an increased risk of infection with the use of TNF-BA. None of the other studies which compared continued with discontinued treatment at surgery found an increased risk of infection, when the medication was continued perioperatively. In conclusion, while in theory there is an increased risk of infections when TNF-BA are administered perioperatively, the available literature does not necessarily support this. It rather appears that patients receiving TNF-BA are a priori at a higher risk of postoperative infections. Scheduling surgery at the end of the drug interval and adding one "safety" week prior to surgery should be an acceptable plan in daily clinical practice.
Predictive and Concurrent Validity of Standardized Neurodevelopmental Examinations by the Griffiths Scales and Bayley Scales of Infant Development II
Klinische Padiatrie. Jan, 2013 | Pubmed ID: 23235928
Standardized examinations of preterm infants are used to identify candidates for early intervention. We aimed to assess the predictive power and concurrent validity of the mental development index of the Bayley scales of infant development II (Bayley MDI) and the Griffiths scales developmental quotient (Griffiths DQ) in healthy term and preterm infants <1â€‰500â€‰g birth weight without major perinatal complications.137 Infants (89 term, 48 preterm) were examined by both tests at a corrected age of 6, 12, and 22 months, and 114 went on to undergo Bayley assessments at 39 months.There were significant correlations between Bayley and Griffiths results at 6, 12, and 22 months (r=0.530, 0.714, and 0.833, respectively, p<0.001) but Bland Altman plots revealed major systematic bias at 6 months (Griffiths>Bayley, mean differences 14.3Â±9.8) and 22 months (Bayley>Griffiths, mean difference 5.2Â±13.9) and wide 95% limits of agreement at 6, 12 and 22 months (35.9%, 40.0%, and 52.4%, respectively). The agreement for a presumptive diagnosis of developmental impairment in the group of preterm infants between Bayley examinations obtained at 39 months corrected age (reference) and previous examinations was poor at 6, 12, and 22 months for both Bayley and Griffiths (Cohen's kappa for Griffiths: 0.225, 0.192, 0.369; for Bayley: 0.121, 0.316, 0.369, respectively).Caution should be exercised when interpreting results from standardized neurodevelopmental examinations obtained during the first 2 years of life in comparatively well preterm infants.
The Lysosomal Transfer of LDL/cholesterol from Macrophages into Vascular Smooth Muscle Cells Induces Their Phenotypic Alteration
Cardiovascular Research. Jan, 2013 | Pubmed ID: 23250921
AIMS: Macrophages (MPs) and vascular smooth muscle cells (VSMCs) closely interact within the growing atherosclerotic plaque. An in vitro co-culture model was established to study how MPs modulate VSMC behaviour. METHODS AND RESULTS: MPs were exposed to fluorescence-labelled-acetylated LDL (FL-acLDL) prior to co-culture with VSMCs. Fluorescence microscopy visualized first transport of FL-acLDL within 6 h after co-culture implementation. When MPs had been fed with FL-acLDL in complex with fluorescence-labelled cholesterol (FL-Chol), these complexes were also transferred during co-culture and resulted in cholesterol positive lipid droplet formation in VSMCs. When infected with a virus coding for a fusion protein of Rab5a and fluorescent protein reporter (FP) to mark early endosomes, no co-localization between Rab5a-FP and the transported FL-acLDL within VSMCs was detected implying a mechanism independent of phagocytosis. Next, expression of lysosome-associated membrane glycoprotein 1 (LAMP1)-FP, marking all lysosomes in VSMCs, revealed that the FL-acLDL was located in non-acidic lysosomes. MPs infected with virus encoding for LAMP1-FP prior to co-culture demonstrated that intact fluorescence-marked lysosomes were transported into the VSMC, instead. Xenogenic cell composition (rat VSMC, human MP) and subsequent quantitative RT-PCR with rat-specific primers rendered induction of genes typical for MPs and down-regulation of the cholesterol sensitive HMG-CoA reductase. CONCLUSION: Our results demonstrate that acLDL/cholesterol-loaded lysosomes are transported from MPs into VSMCs in vitro. Lysosomal transfer results in a phenotypic alteration of the VSMC towards a foam cell-like cell. This way VSMCs may lose their plaque stabilizing properties and rather contribute to plaque destabilization and rupture.
A Statement About Authorship from Individual Members of the International Society for Strategic Studies in Radiology
Radiology. Jan, 2013 | Pubmed ID: 23264522
Prepared for the Possible: Xylanase Gene Transcription in Trichoderma Reesei is Triggered by Different Inducers Representing Different Hemicellulosic Pentose Polymers
Eukaryotic Cell. Jan, 2013 | Pubmed ID: 23291620
The ascomycete Trichoderma reesei is a paradigm for the regulation and production of plant cell wall degrading enzymes including xylanases. Four xylanases including XYN1 and XYN2 of the glycosyl hydrolase family 11, the GH10 XYN3 and the GH30 XYN4 were already described. By genome mining we identified a fifth xylanase XYN5 belonging to GH11. Transcriptional analysis reveals that the expression of all xylanases but xyn3 is induced by d-xylose, dependent on the cellulase- and xylanase-regulator XYR1 and negatively regulated by the carbon catabolite repressor CRE1. Impairment of d-xylose catabolism at the d-xylose reductase and xylitol dehydrogenase step strongly enhanced induction by d-xylose. Knock out of the l-xylulose reductase encoding gene lxr3, which connects the d-xylose and l-arabinose catabolic pathway had no effect on xylanase induction. Beside the induction by d-xylose, the T. reesei xylanases were also induced by l-arabinose, and this induction was also enhanced in knock out mutants in l-arabinose reductase (xyl1), l-arabitol dehydrogenase (lad1) and l-xylulose reductase (lxr3). Induction by l-arabinose was also XYR1 dependent. Analysis of intracellular polyols revealed accumulation of xylitol in all strains only during incubation with d-xylose, and accumulation of l-arabitol only during incubation with l-arabinose. Induction by l-arabinose could be further stimulated by addition of d-xylose. We conclude that the expression of the T. reesei xylanases can be induced by both d-xylose and l-arabinose, but independently of each other, and by using different inducing metabolites.
Nature Chemical Biology. Jan, 2013 | Pubmed ID: 23292653
We describe the discovery of UNC1215, a potent and selective chemical probe for the methyllysine (Kme) reading function of L3MBTL3, a member of the malignant brain tumor (MBT) family of chromatin-interacting transcriptional repressors. UNC1215 binds L3MBTL3 with a K(d) of 120 nM, competitively displacing mono- or dimethyllysine-containing peptides, and is greater than 50-fold more potent toward L3MBTL3 than other members of the MBT family while also demonstrating selectivity against more than 200 other reader domains examined. X-ray crystallography identified a unique 2:2 polyvalent mode of interaction between UNC1215 and L3MBTL3. In cells, UNC1215 is nontoxic and directly binds L3MBTL3 via the Kme-binding pocket of the MBT domains. UNC1215 increases the cellular mobility of GFP-L3MBTL3 fusion proteins, and point mutants that disrupt the Kme-binding function of GFP-L3MBTL3 phenocopy the effects of UNC1215 on localization. Finally, UNC1215 was used to reveal a new Kme-dependent interaction of L3MBTL3 with BCLAF1, a protein implicated in DNA damage repair and apoptosis.
Journal of Perinatal Medicine. Jan, 2013 | Pubmed ID: 23314507
Abstract Objectives: To evaluate the fetal magnetic resonance imaging findings of lymphangiomas. Methods: The magnetic resonance scans of eight fetuses with lymphangiomas were evaluated. Magnetic resonance evaluation included: number; size; signal intensities of the lesions; thickness of the septae; configuration of the margins; presence of blood breakdown products; change in size or signal intensity (in four patients with multiple examinations); exact expansion of the lesions to the adjacent anatomical structures; and concomitant pathological findings. Results were compared with postpartum clinical assessment and imaging in seven patients and with autopsy in one patient. Results: Two retroperitoneal, three thoracic, and three cervical lymphangiomas (diameters between 3.3 and 15.6 cm) were included. All lesions consisted of macrocysts, and additional microcystic parts were found in three lymphangiomas. Blood breakdown products were found in one lesion. Agreement with postpartum imaging was excellent. One patient received intrauterine drainage for chylothorax, and one pregnancy was terminated. Conclusions: Fetal lymphangiomas display the same magnetic resonance imaging features as postnatal lymphangiomas. Intrauterine magnetic resonance characterization of lymphangiomas provides the exact delineation, detection of associated and/or concomitant pathologies, and differential diagnosis among other cystic pathologies. Patient management may be altered with respect to the type and/or time of treatment, and with regard to the continuation or termination of pregnancy.
Autologous Fat Transplantation: Volumetric Tools for Estimation of Volume Survival. A Systematic Review
Aesthetic Plastic Surgery. Jan, 2013 | Pubmed ID: 23354764
Autologous fat transplantation has gained great recognition in aesthetic and reconstructive surgery. Two main aspects are of predominant importance for progress control after autologous fat transplantation to the breast: quantitative information about the rate of fat survival in terms of effective volume persistence and qualitative information about the breast tissue to exclude potential complications of autologous fat transplantation. There are several tools available for use in evaluating the rate of volume survival. They are extensively compared in this review. The anthropometric method, thermoplastic casts, and Archimedes' principle of water displacement are not up to date anymore because of major drawbacks, first and foremost being reduced reproducibility and exactness. They have been replaced by more exact and reproducible tools such as MRI volumetry or 3D body surface scans. For qualitative and quantitative progress control, MRI volumetry offers all the necessary information: evaluation of fat survival and diagnostically valuable imaging to exclude possible complications of autologous fat transplantation. For frequent follow-up, e.g., monthly volume analysis, repeated MRI exams would not be good for the patient and are not cost effective. In these cases, 3D surface imaging is a good tool and especially helpful in a private practice setting where fast data acquisition is needed. This tool also offers the possibility of simulating the results of autologous fat transplantation. LEVEL OF EVIDENCE V: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .
Androgenetic Alopecia: Identification of Four Genetic Risk Loci and Evidence for the Contribution of WNT-signaling to Its Etiology
The Journal of Investigative Dermatology. Jan, 2013 | Pubmed ID: 23358095
The pathogenesis of androgenetic alopecia (AGA, male-pattern baldness) is driven by androgens, and genetic predisposition is the major prerequisite. Candidate gene and genome-wide association studies have reported that single nucleotide polymorphisms (SNPs) at eight different genomic loci are associated with AGA-development. However a significant fraction of the overall heritable risk still awaits identification. Furthermore, understanding of the pathophysiology of AGA is incomplete, and each newly associated locus may provide novel insights into contributing biological pathways. The aim of this study was to identify unknown AGA risk loci by replicating SNPs at the twelve genomic loci that showed suggestive association (5 Ã— 10(-8)