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Find video protocols related to scientific articles indexed in Pubmed.
Influenza A virus uses the aggresome processing machinery for host cell entry.
Science
PUBLISHED: 10-25-2014
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During cell entry, capsids of incoming influenza A viruses (IAVs) must be uncoated before viral ribonucleoproteins (vRNPs) can enter the nucleus for replication. After hemagglutinin-mediated membrane fusion in late endocytic vacuoles, the vRNPs and the matrix proteins dissociate from each other and disperse within the cytosol. Here, we found that for capsid disassembly, IAV takes advantage of the host cell's aggresome formation and disassembly machinery. The capsids mimicked misfolded protein aggregates by carrying unanchored ubiquitin chains that activated a histone deacetylase 6 (HDAC6)-dependent pathway. The ubiquitin-binding domain was essential for recruitment of HDAC6 to viral fusion sites and for efficient uncoating and infection. That other components of the aggresome processing machinery, including dynein, dynactin, and myosin II, were also required suggested that physical forces generated by microtubule- and actin-associated motors are essential for IAV entry.
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Tissue-culture light sheet fluorescence microscopy (TC-LSFM) allows long-term imaging of three-dimensional cell cultures under controlled conditions.
Integr Biol (Camb)
PUBLISHED: 09-03-2014
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Fluorescence long-term imaging of cellular processes in three-dimensional cultures requires the control of media supply, temperature, and pH, as well as minimal photodamage. We describe a system based on a light sheet fluorescence microscope (LSFM), which is optimized for long-term, multi-position imaging of three-dimensional in-gel cell cultures. The system integrates a stable culture condition control system in the optical path of the light-sheet microscope. A further essential element is a biocompatible agarose container suitable for the LSFM, in which any cell type can be cultured in different gel matrices. The TC-LSFM allows studying any in vitro cultured cell type reacting to, dividing in, or migrating through a three-dimensional extracellular matrix (ECM) gel. For this reason we called it "tissue culture-LSFM" (TC-LSFM). The TC-LSFM system allows fast imaging at multiple locations within a millimeter-sized ECM gel. This increases the number of analyzed events and allows testing population effects. As an example, we show the maturation of a cyst of MDCK (canine kidney epithelial) cells over a period of three days. Moreover, we imaged, tracked, and analyzed MDCK cells during the first five days of cell aggregate formation and discovered a remarkable heterogeneity in cell cycle lengths and an interesting cell death pattern. Thus, TC-LSFM allows performing new long-term assays assessing cellular behavior in three-dimensional ECM-gel cultures. For example migration, invasion or differentiation in epithelial cell systems, stem cells, as well as cancer cells can be investigated.
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[Outcomes following rectal and recto-sigmoid cancer resections: comparison of the laparoscopic and open techniques].
Magy Seb
PUBLISHED: 08-16-2014
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Surgical technique and experience are considered as significant determinants of the successful treatment of recto-sigmoid malignancies.
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An in vitro system to study nuclear envelope breakdown.
Methods Cell Biol.
PUBLISHED: 05-27-2014
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During mitosis in vertebrate cells, the nuclear compartment is completely disintegrated in the process of nuclear envelope breakdown (NEBD). NEBD comprises the disassembly of nuclear pore complexes, disintegration of the nuclear lamina, and the retraction of nuclear membranes into the endoplasmic reticulum. Deciphering of the mechanisms that underlie these dynamic changes requires the identification of the involved molecular components and appropriate experimental tools to define their mode of action. Here, we describe an in vitro, imaging-based experimental system, which recapitulates NEBD. In our assay, we induce NEBD on nuclei of semi-permeabilized HeLa cells expressing fluorescently tagged nuclear envelope (NE) marker proteins by addition of mitotic cell extract that is supplemented with fluorescently labeled dextran. Time-lapse confocal microscopy is used to monitor the fate of the selected NE marker protein, and loss of the NE permeability barrier is deduced by influx of the fluorescent dextran into the nucleus. This in vitro system provides a powerful tool to follow NEBD and to characterize factors required for the reorganization of the NE during mitosis.
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Genome-wide small interfering RNA screens reveal VAMP3 as a novel host factor required for Uukuniemi virus late penetration.
J. Virol.
PUBLISHED: 05-21-2014
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The Bunyaviridae constitute a large family of enveloped animal viruses, many of which are important emerging pathogens. How bunyaviruses enter and infect mammalian cells remains largely uncharacterized. We used two genome-wide silencing screens with distinct small interfering RNA (siRNA) libraries to investigate host proteins required during infection of human cells by the bunyavirus Uukuniemi virus (UUKV), a late-penetrating virus. Sequence analysis of the libraries revealed that many siRNAs in the screens inhibited infection by silencing not only the intended targets but additional genes in a microRNA (miRNA)-like manner. That the 7-nucleotide seed regions in the siRNAs can cause a perturbation in infection was confirmed by using synthetic miRNAs (miRs). One of the miRs tested, miR-142-3p, was shown to interfere with the intracellular trafficking of incoming viruses by regulating the v-SNARE VAMP3, a strong hit shared by both siRNA screens. Inactivation of VAMP3 by the tetanus toxin led to a block in infection. Using fluorescence-based techniques in fixed and live cells, we found that the viruses enter VAMP3(+) endosomal vesicles 5 min after internalization and that colocalization was maximal 15 min thereafter. At this time, LAMP1 was associated with the VAMP3(+) virus-containing endosomes. In cells depleted of VAMP3, viruses were mainly trapped in LAMP1-negative compartments. Together, our results indicated that UUKV relies on VAMP3 for penetration, providing an indication of added complexity in the trafficking of viruses through the endocytic network.
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Full-length genome sequence analysis of a Hungarian porcine reproductive and respiratory syndrome virus isolated from a pig with severe respiratory disease.
Arch. Virol.
PUBLISHED: 05-08-2014
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Here, we report the isolation of a type 1 porcine reproductive and respiratory syndrome virus (PRRSV) strain from a clinical outbreak of severe respiratory problems and high fever. Next-generation sequencing was used to determine the complete genome sequence of the isolate (9625/2012). The virus belongs to a new branch within subtype 1, clade D, and shows the highest similarity to PRRSV Olot/1991 and to the Amervac vaccine strain. Mutation analysis of 9625/2012 revealed no evidence of recombination but did show a high proportion of amino acid substitutions in the putative neutralizing epitopes, suggesting an important role of selective immune pressure in the evolution of PRRSV 9625/2012.
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The host nonsense-mediated mRNA decay pathway restricts Mammalian RNA virus replication.
Cell Host Microbe
PUBLISHED: 04-11-2014
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In addition to classically defined immune mechanisms, cell-intrinsic processes can restrict virus infection and have shaped virus evolution. The details of this virus-host interaction are still emerging. Following a genome-wide siRNA screen for host factors affecting replication of Semliki Forest virus (SFV), a positive-strand RNA (+RNA) virus, we found that depletion of nonsense-mediated mRNA decay (NMD) pathway components Upf1, Smg5, and Smg7 led to increased levels of viral proteins and RNA and higher titers of released virus. The inhibitory effect of NMD was stronger when virus replication efficiency was impaired by mutations or deletions in the replicase proteins. Consequently, depletion of NMD components resulted in a more than 20-fold increase in production of these attenuated viruses. These findings indicate that a cellular mRNA quality control mechanism serves as an intrinsic barrier to the translation of early viral proteins and the amplification of +RNA viruses in animal cells.
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Active Learning Strategies for Phenotypic Profiling of High-Content Screens.
J Biomol Screen
PUBLISHED: 03-18-2014
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High-content screening is a powerful method to discover new drugs and carry out basic biological research. Increasingly, high-content screens have come to rely on supervised machine learning (SML) to perform automatic phenotypic classification as an essential step of the analysis. However, this comes at a cost, namely, the labeled examples required to train the predictive model. Classification performance increases with the number of labeled examples, and because labeling examples demands time from an expert, the training process represents a significant time investment. Active learning strategies attempt to overcome this bottleneck by presenting the most relevant examples to the annotator, thereby achieving high accuracy while minimizing the cost of obtaining labeled data. In this article, we investigate the impact of active learning on single-cell-based phenotype recognition, using data from three large-scale RNA interference high-content screens representing diverse phenotypic profiling problems. We consider several combinations of active learning strategies and popular SML methods. Our results show that active learning significantly reduces the time cost and can be used to reveal the same phenotypic targets identified using SML. We also identify combinations of active learning strategies and SML methods which perform better than others on the phenotypic profiling problems we studied.
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Secreted Candida parapsilosis lipase modulates the immune response of primary human macrophages.
Virulence
PUBLISHED: 03-13-2014
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Candida parapsilosis is an important opportunistic pathogen with increasing prevalence. Extracellular lipases have been shown to play an important role in the virulence of pathogenic Candida species. However, studying the role of secreted lipase in C. albicans is challenging due to the lack of a mutant strain deficient in all 10 lipase genes. In contrast, we have previously constructed a lipase mutant C. parapsilosis strain lacking both CpLIP1 and CpLIP2, and shown that it has significantly decreased virulence in various infection models, and is killed more efficiently by mouse macrophages. In the present study, we compared the response of human peripheral blood monocyte-derived macrophages to a wild type (wt) as well as a lipase-deficient (lip(-/-)) C. parapsilosis strain that has been previously established in our lab. Although macrophages phagocytosed both strains with similar efficiency, lipase mutants were killed more efficiently according to fluorescent microscopic analysis. The more efficient killing of lip(-/-) cells was confirmed by CFU-determinations. Phagocytosis of wt and lip(-/-)C. parapsilosis was also examined by flow cytometry, revealing that both strains were internelized to the similar extent by macrophages. Additionally, quantitative imaging analysis revealed that the rate of phagolysosome fusion was higher in case of lip(-/-)C. parapsilosis. Interestingly, macrophages stimulated with lip(-/-)C. parapsilosis showed at least 1.5-fold higher expression of TNF?, IL-1?, IL-6, IL-8, and PTGS-2 after 12 h compared with those infected with wt C. parapsilosis, as determined by qRT-PCR. Furthermore, the lip(-/-)C. parapsilosis strain induced significantly higher TNF?, IL-1?, IL-6, and IL-10 protein production in macrophages after 24 h compared with the wt strain. These findings confirm the role of fungal lipases as important virulence factors during C. parapsilosis infection.
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Fast and robust next-generation sequencing technique using ion torrent personal genome machine for the screening of neurofibromatosis type 1 (NF1) gene.
J. Mol. Neurosci.
PUBLISHED: 01-28-2014
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Neurofibromatosis type 1 (NF1) gene exhibits one of the highest spontaneous mutation rates in the human genome. Identification of the NF1 mutation is challenging because the NF1 gene is very large and complex, lacking mutational "hot spots." There is no clustering of mutations, there are several pseudogenes, and a wide spectrum of different types of mutation has been recognized. To date, NF1 mutations or deleted regions have been detected with a number of techniques. With the appearance of next-generation sequencing (NGS) machines, molecular biology is in a new revolutionary phase. Our aim was to work out a method to use the high-throughput NGS machine, Ion Torrent PGM, in diagnostic settings for neurofibromatosis type 1. In our examination, we could reveal 21 distinct variations in NF1 gene in seven patients. This is an absolutely new method for exploring the genetic background of neurofibromatosis type 1 exhibiting the extremely high throughput of NGS in a diagnostic setting.
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EAES recommendations for the management of gastroesophageal reflux disease.
Surg Endosc
PUBLISHED: 01-08-2014
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Gastroesophageal reflux disease (GERD) is one of the most frequent benign disorders of the upper gastrointestinal tract. Management of GERD has always been controversial since modern medical therapy is very effective, but laparoscopic fundoplication is one of the few procedures that were quickly adapted to the minimal access technique. The purpose of this project was to analyze the current knowledge on GERD in regard to its pathophysiology, diagnostic assessment, medical therapy, and surgical therapy, and special circumstances such as GERD in children, Barrett's esophagus, and enteroesophageal and duodenogastroesophageal reflux.
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Nuclear motility in glioma cells reveals a cell-line dependent role of various cytoskeletal components.
PLoS ONE
PUBLISHED: 01-01-2014
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Nuclear migration is a general term for the movement of the nucleus towards a specific site in the cell. These movements are involved in a number of fundamental biological processes, such as fertilization, cell division, and embryonic development. Despite of its importance, the mechanism of nuclear migration is still poorly understood in mammalian cells. In order to shed light on the mechanical processes underlying nuclear movements, we adapted a micro-patterning based assay. C6 rat and U87 human glioma cells seeded on fibronectin patterns--thereby forced into a bipolar morphology--displayed oscillatory movements of the nucleus or the whole cell, respectively. We found that both the actomyosin system and microtubules are involved in the nuclear/cellular movements of both cell lines, but their contributions are cell-/migration-type specific. Dynein activity was necessary for nuclear migration of C6 cells but active myosin-II was dispensable. On the other hand, coupled nuclear and cellular movements of U87 cells were driven by actomyosin contraction. We explain these cell-line dependent effects by the intrinsic differences in the overall mechanical tension due to the various cytoskeletal elements inside the cell. Our observations showed that the movements of the nucleus and the centrosome are strongly correlated and display large variation, indicating a tight but flexible coupling between them. The data also indicate that the forces responsible for nuclear movements are not acting directly via the centrosome. Based on our observations, we propose a new model for nuclear oscillations in C6 cells in which dynein and microtubule dynamics are the main drivers of nuclear movements. This mechanism is similar to the meiotic nuclear oscillations of Schizosaccharomyces pombe and may be evolutionary conserved.
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Rupture of pseudoaneurysm into hepaticojejunal anastomosis: report of three cases.
Hepatogastroenterology
PUBLISHED: 06-28-2013
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Bleeding complications are less common after major pancreatic resections. They are more often associated with pancreatic fistula. The authors present three cases of a unique situation, when pseudoaneurysm of the common hepatic artery ruptured into the hepaticojejunal anastomosis, causing massive upper gastrointestinal haemorrhage. The basic operations were pancreatic resections for malignancy. In two out of the three cases intra-abdominal infection developed postoperatively. Computer tomographic angiography was a useful tool to reveal the source of bleeding. A re-do surgery was carried out whereby bleeding control was achieved with haemostatic sutures and the biliodigestive anastomoses were also repaired. Re-bleeding did not occur postoperatively and the liver function remained normal. The authors emphasize that in case of severe gastrointestinal bleeding after pancreatic resection, this rare entity ought to be taken into account in the differential diagnosis.
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Fasting glucose level modulates cell surface expression of CD11b and CD66b in granulocytes and monocytes of patients with type 2 diabetes.
J. Investig. Med.
PUBLISHED: 05-21-2013
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Cardiovascular complications are the leading cause of mortality in type 2 diabetes (T2DM), in which onset and progression of atherosclerosis is linked to chronic inflammation. Activation status of innate immune cells (granulocytes [Gc], monocytes [Mc]), as reflected by increased CD11b, CD66b, and other surface markers, increases their endothelial and cytokines/chemokines release. Whereas this inflammatory activation seems inversely related to poor glycemic control, the effect of acute spontaneous hyperglycemia on innate immune cell activation remains unclear.
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CYP24A1 inhibition facilitates the anti-tumor effect of vitamin D3 on colorectal cancer cells.
World J. Gastroenterol.
PUBLISHED: 05-16-2013
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The effects of vitamin D3 have been investigated on various tumors, including colorectal cancer (CRC). 25-hydroxyvitamin-D3-24-hydroxylase (CYP24A1), the enzyme that inactivates the active vitamin D3 metabolite 1,25-dihydroxyvitamin D3 (1,25-D3), is considered to be the main enzyme determining the biological half-life of 1,25-D3. During colorectal carcinogenesis, the expression and concentration of CYP24A1 increases significantly, suggesting that this phenomenon could be responsible for the proposed efficacy of 1,25-D3 in the treatment of CRC. The aim of this study was to investigate the anti-tumor effects of vitamin D3 on the human CRC cell line Caco-2 after inhibition of the cytochrome P450 component of CYP24A1 activity.
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Biorelevant solubility of poorly soluble drugs: rivaroxaban, furosemide, papaverine and niflumic acid.
J Pharm Biomed Anal
PUBLISHED: 03-14-2013
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In this work the biorelevant solubility of four drugs representing different acid-base property, wide range of lipohilicity and low aqueous solubility was studied. The equilibrium solubility of rivaroxaban (non-ionizable), furosemide (acid), papaverine (base) and niflumic acid (ampholyte) was determined in simulated gastric fluid (SGF pH 1.2), in simulated intestinal fluid fasted state (FaSSIF pH 6.5) and fed state (FeSSIF pH 5.0) and their corresponding blank buffers at a temperature of 37 °C using saturation shake-flask method. The concentration was measured by optimized HPLC analysis. The solubilizing effect of bile acid/lipid micelles as additive components of biorelevent media (BRM) is expressed with the solubility ratio (SR: SBRM/Sblank buffer) and the food effect was estimated from SFeSSIF/SFaSSIF coefficient. It was revealed that ionization plays primarily role in solubility of compounds which undergo ionization in BRM. The solubilizing effect in FaSSIF was marginal for the neutral compound (rivaroxaban) and for molecules are anionic at pH 6.5 (furosemide and niflumic acid). The higher concentration of solubilizing agents in FeSSIF improved the solubility of papaverine carrying positive charge and niflumic acid being partially zwitterionic at pH 5.0.
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Characterization of virulence properties in the C. parapsilosis sensu lato species.
PLoS ONE
PUBLISHED: 01-01-2013
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The C. parapsilosis sensu lato group involves three closely related species, C. parapsilosis sensu stricto, C. orthopsilosis and C. metapsilosis. Although their overall clinical importance is dramatically increasing, there are few studies regarding the virulence properties of the species of the psilosis complex. In this study, we tested 63 C. parapsilosis sensu stricto, 12 C. metapsilosis and 18 C. orthopsilosis isolates for the ability to produce extracellular proteases, secrete lipases and form pseudohyphae. Significant differences were noted between species, with the C. metapsilosis strains failing to secrete lipase or to produce pseudohyphae. Nine different clinical isolates each of C. parapsilosis sensu stricto, C. orthopsilosis and C. metapsilosis were co-cultured with immortalized murine or primary human macrophages. C. parapsilosis sensu stricto isolates showed a significantly higher resistance to killing by primary human macrophages compared to C. orthopsilosis and C. metapsilosis isolates. In contrast, the killing of isolates by J774.2 mouse macrophages did not differ significantly between species. However, C. parapsilosis sensu stricto isolates induced the most damage to murine and human macrophages, and C. metapsilosis strains were the least toxic. Furthermore, strains that produced lipase or pseudohyphae were most resistant to macrophage-mediated killing and produced the most cellular damage. Finally, we used 9 isolates of each of the C. parapsilosis sensus lato species to examine their impact on the survival of Galleriamellonella larvae. The mortality rate of G. mellonella larvae infected with C. metapsilosis isolates was significantly lower than those infected with C. parapsilosis sensu stricto or C. orthopsilosis strains. Taken together, our findings demonstrate that C. metapsilosis is indeed the least virulent member of the psilosis group, and also highlight the importance of pseudohyphae and secreted lipases during fungal-host interactions.
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High-content analysis of sequential events during the early phase of influenza A virus infection.
PLoS ONE
PUBLISHED: 01-01-2013
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Influenza A virus (IAV) represents a worldwide threat to public health by causing severe morbidity and mortality every year. Due to high mutation rate, new strains of IAV emerge frequently. These IAVs are often drug-resistant and require vaccine reformulation. A promising approach to circumvent this problem is to target host cell determinants crucial for IAV infection, but dispensable for the cell. Several RNAi-based screens have identified about one thousand cellular factors that promote IAV infection. However, systematic analyses to determine their specific functions are lacking. To address this issue, we developed quantitative, imaging-based assays to dissect seven consecutive steps in the early phases of IAV infection in tissue culture cells. The entry steps for which we developed the assays were: virus binding to the cell membrane, endocytosis, exposure to low pH in endocytic vacuoles, acid-activated fusion of viral envelope with the vacuolar membrane, nucleocapsid uncoating in the cytosol, nuclear import of viral ribonucleoproteins, and expression of the viral nucleoprotein. We adapted the assays to automated microscopy and optimized them for high-content screening. To quantify the image data, we performed both single and multi-parametric analyses, in combination with machine learning. By time-course experiments, we determined the optimal time points for each assay. Our quality control experiments showed that the assays were sufficiently robust for high-content analysis. The methods we describe in this study provide a powerful high-throughput platform to understand the host cell processes, which can eventually lead to the discovery of novel anti-pathogen strategies.
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[Functional MRI investigation of brain activity triggered by taste stimulation].
Magy Seb
PUBLISHED: 12-16-2011
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Many factors contribute to the pathogenesis of morbid obesity, and the central nervous system - as one of those - also has an important role. Numerous studies focus on the central regulation of eating and metabolism, since associated problems like obesity, anorexia, diabetes or metabolic syndrome put an increasing burden on the health system of modern societies. Neither the pathophysiologic changes, nor the normal regulation of these systems are known adequately. Functional MR (fMRI) imaging, which has certainly gained popularity recently, aims to better understand these mechanisms. In this series we studied the brain fMRI activity changes of normal and obese persons, triggered by gustatory stimulation.
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[Postgastrectomy symptoms following total gastrectomy with or without preservation of the duodenal passage].
Magy Seb
PUBLISHED: 12-16-2011
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Total gastrectomy leads to decreased quality of life, which is characterized by different symptoms of the postgastrectomy syndrome. Aim of this study was to investigate the correlation of different alimentary symptoms and habits in correlation with the reconstruction type after total gastrectomy.
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Surgical site infections after abdominal closure in colorectal surgery using triclosan-coated absorbable suture (PDS Plus) vs. uncoated sutures (PDS II): a randomized multicenter study.
Surg Infect (Larchmt)
PUBLISHED: 12-05-2011
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Surgical site infections (SSI) are the third most common hospital-acquired infections and account for 14% to 16% of all such infections. In elective colorectal operations, the international SSI rate ranges from 4.7%-25%. In a previous retrospective study in this department, the SSI rate was unacceptably high (25%), and the promising different international evaluations of triclosan-coated suture materials encouraged us to create a multicenter randomized trial to improve our results. The main goal of this study was to compare triclosan-coated and uncoated absorbable suture (PDS Plus(®) with PDS II(®)) in elective colorectal operations.
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Dietary intakes of total and specific lignans are associated with clinical breast tumor characteristics.
J. Nutr.
PUBLISHED: 11-23-2011
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Dietary lignans may affect breast cancer by modifying tumor characteristics likely to affect prognosis. We investigated usual dietary intakes of total and specific lignans with tumor characteristics in 683 women with breast cancer and 611 healthy women without breast cancer enrolled in the Data Bank and BioRepository at Roswell Park Cancer Institute (RPCI). Clinicopathologic data were abstracted from the RPCI breast cancer database. Dietary lignan intakes were calculated from FFQ. OR and 95% CI were estimated with logistic regression adjusting for potential confounders and stratified by menopausal status. Women in the highest compared to the lowest tertile of total lignan intakes had a 40-50% lower odds of breast cancer regardless of menopausal status and substantially reduced odds of an invasive tumor, especially among premenopausal women [OR 0.48 (95% CI 0.26-0.86)]. Lignan intakes were inversely associated with odds of grade 3 tumors among premenopausal women. Lignan intakes were inversely associated with risk of estrogen receptor (ER) negative (ER(-)) breast cancer among premenopausal women [OR 0.16 (95% CI 0.03-0.44)] and particularly triple negative tumors [ER(-), progesterone receptor negative, HER2 negative; OR 0.16 (95% CI 0.04-0.62)]. There were significant differences in the contribution to these effects by specific lignans, especially matairesinol and lariciresinol. In summary, in this case-control study of dietary lignan intakes and breast cancer, we found that higher lignan intakes were associated with lower risks of breast cancer with more favorable prognostic characteristics. Future investigations are warranted to explore the strong associations observed with ER(-) cancer in premenopausal women.
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[Primary systemic therapy in breast cancer patients (2007-2010)].
Magy Seb
PUBLISHED: 10-15-2011
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The importance of preoperative neoadjuvant (NA) systemic treatment in operable breast cancer has significantly increased in the last few years. The aim of our retrospective study was to determine the effect of NA therapy in breast cancer patients treated in our unit and analyze radiological and pathological response rates in the context of surgical treatment.
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Substrate adhesion regulates sealing zone architecture and dynamics in cultured osteoclasts.
PLoS ONE
PUBLISHED: 08-30-2011
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The bone-degrading activity of osteoclasts depends on the formation of a cytoskeletal-adhesive super-structure known as the sealing zone (SZ). The SZ is a dynamic structure, consisting of a condensed array of podosomes, the elementary adhesion-mediating structures of osteoclasts, interconnected by F-actin filaments. The molecular composition and structure of the SZ were extensively investigated, yet despite its major importance for bone formation and remodelling, the mechanisms underlying its assembly and dynamics are still poorly understood. Here we determine the relations between matrix adhesiveness and the formation, stability and expansion of the SZ. By growing differentiated osteoclasts on micro-patterned glass substrates, where adhesive areas are separated by non-adhesive PLL-g-PEG barriers, we show that SZ growth and fusion strictly depend on the continuity of substrate adhesiveness, at the micrometer scale. We present a possible model for the role of mechanical forces in SZ formation and reorganization, inspired by the current data.
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[New type of retrograde dissection during pancreatoduodenectomy - first experiences.]
Magy Seb
PUBLISHED: 08-13-2011
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The authors emphasize that late results following surgery for pancreatic cancer can be improved by increasing the rate of R0 resections. Therefore, they propose a new method for pancreatic head resection, which starts with the dissection of the uncinate process and continues in a caudo-cranial direction (retrograde). Thus the superior mesenteric artery comes into view at the beginning, and the peripancreatic tissues can be removed completely along the vessel consequently. This method can potentially decrease the risk of the bleeding and major vessel injury. The authors carried out six pancreatic head resections with the technique mentioned above, and histology revealed R0 resection in all six cases. Non-traditional, retrograde dissection of the pancreatic head is a recommended method which is supported by literature data as well as the authors own experience.
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Machine learning improves the precision and robustness of high-content screens: using nonlinear multiparametric methods to analyze screening results.
J Biomol Screen
PUBLISHED: 08-01-2011
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Imaging-based high-content screens often rely on single cell-based evaluation of phenotypes in large data sets of microscopic images. Traditionally, these screens are analyzed by extracting a few image-related parameters and use their ratios (linear single or multiparametric separation) to classify the cells into various phenotypic classes. In this study, the authors show how machine learning-based classification of individual cells outperforms those classical ratio-based techniques. Using fluorescent intensity and morphological and texture features, they evaluated how the performance of data analysis increases with increasing feature numbers. Their findings are based on a case study involving an siRNA screen monitoring nucleoplasmic and nucleolar accumulation of a fluorescently tagged reporter protein. For the analysis, they developed a complete analysis workflow incorporating image segmentation, feature extraction, cell classification, hit detection, and visualization of the results. For the classification task, the authors have established a new graphical framework, the Advanced Cell Classifier, which provides a very accurate high-content screen analysis with minimal user interaction, offering access to a variety of advanced machine learning methods.
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Possible predictors of histopathological response to neoadjuvant chemoradiotherapy for rectal cancer.
J. Cancer Res. Clin. Oncol.
PUBLISHED: 06-21-2011
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The response to neoadjuvant chemoradiotherapy (CRT) varies greatly in patients suffering from locally advanced rectal cancer. Our aim was to correlate the response to CRT with the pre-treatment expression of heat shock protein 90 (Hsp90), small heat shock protein 16.2 (sHsp 16.2), phospho-Akt (p-Akt), growth hormone-releasing hormone receptor (GHRH-R) and heme-binding protein 2 (SOUL) in order to try to identify one or more as a predictive marker.
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Middle segmental pancreatic resection--a single-centre experience.
Hepatogastroenterology
PUBLISHED: 06-14-2011
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A single-centre experience gained by middle segmental pancreatic resection and a brief survey of technique and indications are reported.
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Histone deacetylase 8 is required for centrosome cohesion and influenza A virus entry.
PLoS Pathog.
PUBLISHED: 06-10-2011
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Influenza A virus (IAV) enters host cells by endocytosis followed by acid-activated penetration from late endosomes (LEs). Using siRNA silencing, we found that histone deacetylase 8 (HDAC8), a cytoplasmic enzyme, efficiently promoted productive entry of IAV into tissue culture cells, whereas HDAC1 suppressed it. HDAC8 enhanced endocytosis, acidification, and penetration of the incoming virus. In contrast, HDAC1 inhibited acidification and penetration. The effects were connected with dramatic alterations in the organization of the microtubule system, and, as a consequence, a change in the behavior of LEs and lysosomes (LYs). Depletion of HDAC8 caused loss of centrosome-associated microtubules and loss of directed centripetal movement of LEs, dispersing LE/LYs to the cell periphery. For HDAC1, the picture was the opposite. To explain these changes, centrosome cohesion emerged as the critical factor. Depletion of HDAC8 caused centrosome splitting, which could also be induced by depleting a centriole-linker protein, rootletin. In both cases, IAV infection was inhibited. HDAC1 depletion reduced the splitting of centrosomes, and enhanced infection. The longer the distance between centrosomes, the lower the level of infection. HDAC8 depletion was also found to inhibit infection of Uukuniemi virus (a bunyavirus) suggesting common requirements among late penetrating enveloped viruses. The results established class I HDACs as powerful regulators of microtubule organization, centrosome function, endosome maturation, and infection by IAV and other late penetrating viruses.
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Phosphorylation of Nup98 by multiple kinases is crucial for NPC disassembly during mitotic entry.
Cell
PUBLISHED: 02-22-2011
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Disassembly of nuclear pore complexes (NPCs) is a decisive event during mitotic entry in cells undergoing open mitosis, yet the molecular mechanisms underlying NPC disassembly are unknown. Using chemical inhibition and depletion experiments we show that NPC disassembly is a phosphorylation-driven process, dependent on CDK1 activity and supported by members of the NIMA-related kinase (Nek) family. We identify phosphorylation of the GLFG-repeat nucleoporin Nup98 as an important step in mitotic NPC disassembly. Mitotic hyperphosphorylation of Nup98 is accomplished by multiple kinases, including CDK1 and Neks. Nuclei carrying a phosphodeficient mutant of Nup98 undergo nuclear envelope breakdown slowly, such that both the dissociation of Nup98 from NPCs and the permeabilization of the nuclear envelope are delayed. Together, our data provide evidence for a phosphorylation-dependent mechanism underlying disintegration of NPCs during prophase. Moreover, we identify mitotic phosphorylation of Nup98 as a rate-limiting step in mitotic NPC disassembly.
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[From the surgical field to the microscope. A new tool to identify the lymph node specimens in oncologic surgery].
Magy Seb
PUBLISHED: 02-19-2011
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Oncologic surgery and pTNM staging require systemic removal of the locoregional lymphnodes. While the optimal extent and therapeutical and/or prognostic value of the lymphadenectomy/sampling are debated organ by organ and (sub)speciality by (sub)speciality, relevance of the lymphnode sytem-tumor concept itself is beyond doubt. Loss of information and existence of traps on the "surgical field-microscope" pathway is an international phenomenon, calling for solution. An integrated sterile and disposable lymphnode tray system is presented here for applications in the different fields of cancer surgery of the upper GI tract, retroperitoneum (gynecology, urology) and ear-nose-throat surgery.
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Comparison of the prevalence of malnutrition diagnosis in head and neck, gastrointestinal, and lung cancer patients by 3 classification methods.
Cancer Nurs
PUBLISHED: 01-19-2011
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Malnutrition is prevalent among patients within certain cancer types. There is lack of universal standard of care for nutrition screening and a lack of agreement on an operational definition and on validity of malnutrition indicators.
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[The use of mesh in the surgical treatment of hiatal hernias].
Magy Seb
PUBLISHED: 10-23-2010
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Primary suture repair of large hiatal hernias is associated with high recurrence rate, but the use of mesh may improve the results. There is no agreement about the ideal size, shape, or material of these mesh prosthesis, or the way those should be fixed to the crura. One of the biggest concerns of insetting a prosthetic material at the hiatus is erosion into the stomach, esophagus, or both. Cardiac injury at the time of mesh anchorage is a rare but potentially fatal complication. Introduction of biomaterials into clinical practise has completely changed the outlook of these surgical procedures.
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["Onlay" mesh provides significantly better results than "sublay" reconstruction. Prospective randomized multicenter study of abdominal wall reconstruction with sutures only, or with surgical mesh--results of a five-years follow-up].
Magy Seb
PUBLISHED: 10-23-2010
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There are several well-known procedures to treat abdominal wall hernias, but the results are quite controversial. The aim of study was to compare the results of different surgical modalities - mesh (onlay vs. sublay position) and suture repair - in the treatment of abdominal wall hernias.
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[Long-term results of open tension-free or tension repair of inguinal hernias--retrospective study].
Magy Seb
PUBLISHED: 10-23-2010
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Authors discuss long-term results of inguinal hernia repairs. Patients were asked to fill in a questionnaire to compare five-year outcomes after tension-free and non-mesh inguinal hernia reconstructions. Results: the trial is based on the assessement of 155 patients replies. Recurrence rate in tension-free (TF) cases is 3.4% (4/116), while in suture repair (non-mesh - NM) group is 12.8% (5/39). The ratios of totally symptom-free patients are 83% (97/116 - TF) and 89% (35/39 - NM). Severe chronic pain occurred in 1.7% (2/116 - TF) and 7.7% (3/39 - NM). Early return to normal activity was 34% (39/116 - TF) and 29% (11/39 - NM). Conclusion: Based on this retrospective study Lichtenstein repair is superior to non-mesh open inguinal reconstruction, as regards recurrence rates, but chronic pain and recovery time show similar long term results in both groups, which is different from the relevant published literature.
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Timing of gene transcription in the galactose utilization system of Escherichia coli.
J. Biol. Chem.
PUBLISHED: 10-05-2010
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In the natural environment, bacterial cells have to adjust their metabolism to alterations in the availability of food sources. The order and timing of gene expression are crucial in these situations to produce an appropriate response. We used the galactose regulation in Escherichia coli as a model system for understanding how cells integrate information about food availability and cAMP levels to adjust the timing and intensity of gene expression. We simulated the feast-famine cycle of bacterial growth by diluting stationary phase cells in fresh medium containing galactose as the sole carbon source. We followed the activities of six promoters of the galactose system as cells grew on and ran out of galactose. We found that the cell responds to a decreasing external galactose level by increasing the internal galactose level, which is achieved by limiting galactose metabolism and increasing the expression of transporters. We show that the cell alters gene expression based primarily on the current state of the cell and not on monitoring the level of extracellular galactose in real time. Some decisions have longer term effects; therefore, the current state does subtly encode the history of food availability. In summary, our measurements of timing of gene expression in the galactose system suggest that the system has evolved to respond to environments where future galactose levels are unpredictable rather than regular feast and famine cycles.
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[Colon cancer after colon interposition for oesophageal replacement].
Magy Seb
PUBLISHED: 08-21-2010
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The authors report the case of a colon adenocarcinoma developed on the neck at the anastomosis of the skin tube and colon 44 years following a corrosive oesophageal injury. This patient suffered a moderately severe oesophageal, stomach and laryngeal injuries due to drinking hydrochloric acid 44 years ago. He underwent serial laryngoplasties, then needed a tracheostomy, oesophagectomy, pyloroplasty and ileocolon transposition. An antethoracal oesophagus formation was performed with ileocolon and skin tube amendment. 44 years later an ulcerated adenocarcinoma developed in the transposed colon, which was resected and the ability to swallow was reinstated by the transplantation of an isolated jejunal segment using microvascular anastomosis.
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Genetic flexibility of regulatory networks.
Proc. Natl. Acad. Sci. U.S.A.
PUBLISHED: 07-06-2010
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Gene regulatory networks are based on simple building blocks such as promoters, transcription factors (TFs) and their binding sites on DNA. But how diverse are the functions that can be obtained by different arrangements of promoters and TF binding sites? In this work we constructed synthetic regulatory regions using promoter elements and binding sites of two noninteracting TFs, each sensing a single environmental input signal. We show that simply by combining these three kinds of elements, we can obtain 11 of the 16 Boolean logic gates that integrate two environmental signals in vivo. Further, we demonstrate how combination of logic gates can result in new logic functions. Our results suggest that simple elements of transcription regulation form a highly flexible toolbox that can generate diverse functions under natural selection.
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[Clinical study of non-melanoma skin cancer following human organ transplantation].
Magy Seb
PUBLISHED: 04-20-2010
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Increasing evidence suggests that non-melanoma skin cancers (NMSC) are the most frequent tumours in transplanted patients. In this study, we present the first Hungarian dermatological screening program to establish the incidence of NMSC after organ transplantations.
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A protein inventory of human ribosome biogenesis reveals an essential function of exportin 5 in 60S subunit export.
PLoS Biol.
PUBLISHED: 04-07-2010
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The assembly of ribosomal subunits in eukaryotes is a complex, multistep process so far mostly studied in yeast. In S. cerevisiae, more than 200 factors including ribosomal proteins and trans-acting factors are required for the ordered assembly of 40S and 60S ribosomal subunits. To date, only few human homologs of these yeast ribosome synthesis factors have been characterized. Here, we used a systematic RNA interference (RNAi) approach to analyze the contribution of 464 candidate factors to ribosomal subunit biogenesis in human cells. The screen was based on visual readouts, using inducible, fluorescent ribosomal proteins as reporters. By performing computer-based image analysis utilizing supervised machine-learning techniques, we obtained evidence for a functional link of 153 human proteins to ribosome synthesis. Our data show that core features of ribosome assembly are conserved from yeast to human, but differences exist for instance with respect to 60S subunit export. Unexpectedly, our RNAi screen uncovered a requirement for the export receptor Exportin 5 (Exp5) in nuclear export of 60S subunits in human cells. We show that Exp5, like the known 60S exportin Crm1, binds to pre-60S particles in a RanGTP-dependent manner. Interference with either Exp5 or Crm1 function blocks 60S export in both human cells and frog oocytes, whereas 40S export is compromised only upon inhibition of Crm1. Thus, 60S subunit export is dependent on at least two RanGTP-binding exportins in vertebrate cells.
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Survival after surgery following chemotherapy for non-small-cell lung cancer.
Asian Cardiovasc Thorac Ann
PUBLISHED: 03-23-2010
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A retrospective study was carried out on 74 patients with advanced non-small-cell lung cancer (52 in stage IIIA, 22 in stage IIIB) who received platinum-based induction chemotherapy in doublets and triplets, followed by tumor resection. Thirty-day postoperative mortality was 5.4% (4 patients); 5 patients in stage IIIB and 17 in stage IIIA did not respond, but the other 47 (63.5%) were downstaged to < IIIA (26 were downstaged to stage I, 20 to stage II, and 1 had complete remission). There was no change in T factor in 22 (30%) patients, nor in N factor in 21 (28%). The actuarial 5-year survival rate for patients in postoperative stages IIIA and IIIB was 0.496; survival was significantly longer in patients who responded to therapy. Parallel improvement in both T and N status predicted worse survival than a multistage regression in any single factor. N status was found to be a stronger survival indicator than T status. Cell type did not influence the response rate or outcome. Induction chemotherapy significantly improved survival in patients who responded, despite a poor prognosis.
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Structure and stereochemistry of novel ecdysteroids from the roots of Serratula wolffii.
Magn Reson Chem
PUBLISHED: 03-06-2010
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Three new natural ecdysteroids viz. 22-dehydro-20-deoxy-ajugasterone C (1), 1-hydroxy-22-deoxy-20,21-didehydro-ecdysone (2) and 22-deoxy-20,21-didehydro-ecdysone (3) were isolated from the methanol extract of the roots of Serratula wolffii. The structures of compounds 1-3 were established by various spectroscopic techniques, including one- and two-dimensional NMR, circular dichroism and mass spectroscopic methods.
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A classical NLS and the SUN domain contribute to the targeting of SUN2 to the inner nuclear membrane.
EMBO J.
PUBLISHED: 02-12-2010
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Integral membrane proteins of the inner nuclear membrane (INM) are inserted into the endoplasmic reticulum membrane during their biogenesis and are then targeted to their final destination. We have used human SUN2 to delineate features that are required for INM targeting and have identified multiple elements that collectively contribute to the efficient localization of SUN2 to the nuclear envelope (NE). One such targeting element is a classical nuclear localization signal (cNLS) present in the N-terminal, nucleoplasmic domain of SUN2. A second motif proximal to the cNLS is a cluster of arginines that serves coatomer-mediated retrieval of SUN2 from the Golgi. Unexpectedly, also the C-terminal, lumenal SUN domain of SUN2 supports NE localization, showing that targeting elements are not limited to cytoplasmic or transmembrane domains of INM proteins. Together, SUN2 represents the first mammalian INM protein relying on a functional cNLS, a Golgi retrieval signal and a perinuclear domain to mediate targeting to the INM.
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Postprandial lipemia detects the effect of soy protein on cardiovascular disease risk compared with the fasting lipid profile.
Lipids
PUBLISHED: 01-18-2010
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Studies examining the effect of soy protein on cardiovascular disease (CVD) risk factors have not taken advantage of the postprandial state as an adjunct to the fasting lipid profile. The American Heart Association has acknowledged the efficacy of soy protein in reducing CVD risk factors to be limited. We hypothesized that the postprandial state would be more sensitive to any favorable changes associated with consuming soy protein compared with the fasting lipid profile. Furthermore, the presence of isoflavones in soy would enhance this effect. Thirty sedentary males aged 18-30 years were randomly assigned to milk protein (Milk), isoflavone-poor soy (Soy-), or isoflavone-rich soy (Soy+). Usual diets were supplemented with 25 g/day of protein for 28 days. Serum samples were collected before and after supplementation in a fasted state and postprandially at 30, 60, 120, 240, and 360 min after a high-fat, 1,000 kcal shake. Triacylglycerol (TAG), total cholesterol, non-esterified fatty acids, apolipoproteins B-100 and A-I and glucose concentrations were quantified. Fasting concentrations were not different after any protein supplementation. Postprandial TAG and TAG AUC increased after Soy-consumption supporting the postprandial state as a more sensitive indicator of soy ingestion effects on CVD risk factors compared with the fasting lipid profile. Furthermore, the absence of isoflavones in soy protein may have deleterious consequences on purported cardio-protective effects.
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Enhanced CellClassifier: a multi-class classification tool for microscopy images.
BMC Bioinformatics
PUBLISHED: 01-14-2010
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Light microscopy is of central importance in cell biology. The recent introduction of automated high content screening has expanded this technology towards automation of experiments and performing large scale perturbation assays. Nevertheless, evaluation of microscopy data continues to be a bottleneck in many projects. Currently, among open source software, CellProfiler and its extension Analyst are widely used in automated image processing. Even though revolutionizing image analysis in current biology, some routine and many advanced tasks are either not supported or require programming skills of the researcher. This represents a significant obstacle in many biology laboratories.
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[Acute pancreatitis caused by an intraluminal duodenal diverticulum].
Magy Seb
PUBLISHED: 12-01-2009
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Intraluminal duodenal diverticula are a rare congenital disorders, which usually become symptomatic in adults. In our case, recurrent pancreatitis was caused by an intraluminal duodenal diverticulum in a 26 year old woman. The diagnosis was established by CT scan and upper gastroduodenal endoscopy. The intraluminal diverticulum was resected after duodenotomy. In addition, annular pancreas was found during laparotomy. In this case, an intraluminal duodenal diverticulum caused acute pancreatitis and was associated with another anatomical abnormality.
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[A new method for prosthetisation of vascular patients with lower limb amputation: initial experiences with osseointegration technique].
Magy Seb
PUBLISHED: 10-16-2009
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Prostheses use for lower limb amputees is difficult, while the socket is hard, the prosthesis is heavy. Drawbacks of conventional prosthesis are mainly associated with the socket, therefore osseointegration technique is a promising solution, since it doesnt require a socket. Our aim was to introduce this technique in Hungary and extend indication for vascular patients.
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[Treatment of pancreatic and periampullary tumours in our department in the last 10 years].
Magy Seb
PUBLISHED: 10-16-2009
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The authors analyse the results of 363 patients, who underwent surgery for pancreatic or periampullary tumours. There were 175 operable and 188 inoperable cases. The preoperative data (age, gender, site of the tumour, characteristic clinical signs), as well as surgical methods are overviewed. A pancreatoduodenectomy was most frequently applied as a curative surgery, while double-bypass was mainly performed for palliation. As far as postoperative complications, especially the rate of pancreatic fistula, which is influenced by the anastomotic method, are discussed. Reoperation and early postoperative mortality rate was 5,7% and 4,5% in the operable cases, respectively. These numbers were 1,6% and 6,9% among the inoperable cases. Following radical procedure adjuvant therapy followed surgical treatment, its results are also reported. In summary, curative surgical therapy and postoperative adjuvant treatment are necessary for a chance of long-term survival.
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Chemo-radiotherapy in locally advanced squamous cell oesophageal cancer--are upper third tumours more responsive?
Pathol. Oncol. Res.
PUBLISHED: 08-31-2009
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Before neoadjuvant therapy was widely applied, the prognosis of oesophageal cancer had been considered dependent on the location of the tumor, i.e. upper third cancers had had the worst prognosis. The aim of this retrolective study was to prove the efficiency of the neoadjuvant treatment, and to compare the response of esophageal cancer in different locations. Between January 1998 and September 2005, 102 patients with locally advanced squamous cell oesophageal cancer received preoperative chemo-radiotherapy. In 40 cases the tumor was located in the upper third and in 62 cases in the middle third of the oesophagus. After a four-week-long treatment free period restaging was carried out and patients considered resectable were submitted to surgery. From 40 patients with upper third oesophageal cancer 28 underwent oesophageal resection or pharyngo-laryngectomy. Thiry-five percent a complete histopathological remission was observed. From 62 patients with middle third oesophageal cancer 43 underwent oesophageal resection. Histological examination of the resected specimens documented complete response only in three patients. The median survival and the R0 resection rate were similar in the two groups. Although the resection rate, perioperative morbidity, mortality and the median survival were similar in the two groups, a significantly higher rate of complete response (p < 0,05) was observed in patients with upper third oesophageal cancer compared to patients with middle third oesophageal cancer. It seems that upper third oesophageal cancer has superior sensitivity to multimodal treatment therefore our results may support that upper third location is not an unfavorable prognostic factor any more.
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Gradient HPLC separation of dehydroepiandrosterone (DHEA) from its metabolites and biological congeners: role of tetrahydrofuran in the chromatographic mechanism.
Anal Bioanal Chem
PUBLISHED: 05-27-2009
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A three-step gradient reversed-phase high-performance liquid chromatography (RP-HPLC) method was developed for the separation of dehydroepiandrosterone (DHEA), its sulfate ester (DHEA-S), its three C7-oxidized metabolites (7alphaOH-DHEA, 7betaOH-DHEA, 7-keto-DHEA), and its biosynthetic congeners (androstenedione, testosterone, estradiol, pregnenolone). This new method allows the quantitative characterization of DHEA metabolism and biosynthetic transformation under given physiological, pathological, or therapeutically influenced circumstances. Tetrahydrofuran probably acts as a proton acceptor coadsorbent, while isopropanol behaves as a proton donor during the separation of testosterone, estradiol, and the stereoisomers of 7-OH-DHEA.
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Early-stage adenocarcinoma in Barretts esophagus: aspects of surgical therapies.
Dig Dis
PUBLISHED: 05-08-2009
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Adenocarcinomas in Barretts esophagus are increasingly diagnosed at early stages thanks to effective surveillance programs. Subtotal esophagectomy with extended lymphadenectomy is considered the best curative treatment for patients with early adenocarcinoma of the esophagus. However, such treatment is associated with substantial morbidity and compromised quality of life. Limited resection, minimal invasive surgical procedures or endoscopic mucosal ablation have been proposed as less invasive alternatives. A comparison of treatment-associated morbidity, recurrence rate, long-term survival and functional outcome suggests that none of these alternative methods can be universally recommended. An individualized strategy should be employed based on staging (tumor penetration into the mucosa/submucosa, presence of lymph node metastasis), multicentricity of tumor, length of the underlying Barretts mucosa and risk factors of the affected patient. Surgical resection (radical or limited) remains the treatment of choice for tumors invading the submucosa, multicentric tumor growth and recurrence after endoscopic mucosectomy.
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Dominant negative autoregulation limits steady-state repression levels in gene networks.
J. Bacteriol.
PUBLISHED: 05-08-2009
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Many transcription factors repress transcription of their own genes. Negative autoregulation has been shown to reduce cell-cell variation in regulatory protein levels and speed up the response time in gene networks. In this work we examined transcription regulation of the galS gene and the function of its product, the GalS protein. We observed a unique operator preference of the GalS protein characterized by dominant negative autoregulation. We show that this pattern of regulation limits the repression level of the target genes in steady states. We suggest that transcription factors with dominant negative autoregulation are designed for regulating gene expression during environmental transitions.
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Ergonomic evaluation of the scrub nurses posture at different monitor positions during laparoscopic cholecystectomy.
Surg Laparosc Endosc Percutan Tech
PUBLISHED: 04-25-2009
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Our aims were to measure the posture and movement of the scrub nurse very accurately, without using any markers, during a minimally invasive surgical procedure.
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[Surgical treatment of primary leiomyosarcoma of the inferior vena cava].
Magy Seb
PUBLISHED: 04-24-2009
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pLMS in the wall of the inferior vena cava is an extremely rare form of retroperitoneal malignancies. A case in a young female patient is presented; clinical symptoms, pre- and postoperative diagnosis and surgical treatment are discussed. A retroperitoneal mass detected by imaging was found to be a large tumor mass located at the middle segment of the IVC on exploration. The tumour was successfully excised and the IVC was reconstructed with a synthetic graft. Eight years later, this patient needed a repeat surgery due to local recurrence. This time tumour was attached to the left renal vein. A re-resection of the IVC was performed with subsequent synthetic graft reconstruction and the distal end of the left renal vein was reimplanted into a lower segment of IVC.
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[Development of scar cancer after subtotal oesophagectomy for corrosive injury].
Magy Seb
PUBLISHED: 04-24-2009
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The incidence of cicatricial carcinoma of the scarred esophagus in patients with corrosive injuries is relatively high. Therefore, the necessity to resect the diseased oesophagus was raised as opposed to carry out a simple by-pass reconstruction only.
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[Surgical treatment for early Barrett cancer].
Magy Seb
PUBLISHED: 04-24-2009
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Adenocarcinomas in Barretts oesophagus are more commonly diagnosed at an early stage due to effective surveillance programmes. Subtotal oesophagectomy with extended lymphadenectomy is considered the best curative treatment for patients with early adenocarcinoma of the oesophagus. However, such treatment carries substantial morbidity and compromises quality of life. Limited resection, minimal invasive surgical procedures or endoscopic mucosal ablation have been proposed as less invasive alternatives. A comparison of treatment associated morbidity, recurrence rate, long-term survival and functional outcome suggests that none of these alternative methods can be universally recommended. An individualized strategy should be employed based on staging (tumour penetration into the mucosa/submucosa, presence of lymph node metastasis), multicentricity, length of the underlying Barrett mucosa and risk factors of the patient. Surgical resection (radical or limited) remains the treatment of choice for tumours invading the submucosa, or multicentric and recurrent tumours after endoscopic mucosectomy.
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Protective effect of interval exercise on psychophysiological stress reactivity in children.
Psychophysiology
PUBLISHED: 04-06-2009
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Two studies determined whether interval exercise reduces childrens stress reactivity. For Experiment 1 children completed interval exercise (n=14) or watched TV (n=14) for 25 min. After 20 min rest children completed a speech task. Speech-induced diastolic blood pressure (DBP) reactivity was dampened in the exercise group (p<.05). For Experiment 2 children (n=22) completed interval exercise-speech and TV-speech conditions on separate days. Physical activity was assessed by accelerometry and aerobic fitness estimated by submaximal exercise. DBP, systolic BP, and heart rate (HR) reactivity to the speech stressor were dampened (p<.05) after exercise compared to TV watching. Fitness was positively associated with HR reactivity. Interval exercise that mimics usual patterns of physically active play dampens cardiovascular reactivity to interpersonal stress.
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The NANC relaxation of the human ileal longitudinal and circular muscles is inhibited by MRS 2179, a P2 purinoceptor antagonist.
Life Sci.
PUBLISHED: 03-19-2009
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Functional innervation of the human small intestine may be different from that of experimental animals. These experiments set out to assess the mediating roles of P(2) purinoceptors in the non-adrenergic, non-cholinergic (NANC) relaxation of the human ileum longitudinal and circular muscles.
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Influence of PACAP on oxidative stress and tissue injury following small-bowel autotransplantation.
J. Mol. Neurosci.
PUBLISHED: 03-06-2009
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Tissue injury caused by cold preservation and reperfusion remains an unsolved problem during small-bowel transplantation. Pituitary adenylate cyclase-activating polypeptide (PACAP) is present and plays a central role in the intestinal physiology. This study investigated effect of PACAP-38 on the oxidative stress and tissue damage in autotransplanted intestine. Sham-operated, ischemia/reperfusion, and autotransplanted groups were established in Wistar rats. In ischemia/reperfusion groups, 1 h (group A), 2 h (group B), and 3 h (group C) ischemia followed by 3 h of reperfusion was applied. In autotransplanted groups, total orthotopic intestinal autotransplantation was performed. Grafts were preserved in University of Wisconsin (UW) solution and in UW containing 30 microg PACAP-38 for 1, 2, 3, and 6 h. Reperfusion lasted 3 h in all groups. Endogenous PACAP-38 concentration was measured by radioimmunoassay. To determine oxidative stress parameters, malondialdehyde, reduced glutathione, and superoxide dismutase were measured in tissue samples. Tissue damage was analyzed by qualitative and quantitative methods on hematoxylin/eosin-stained sections. Concentration of endogenous PACAP-38 significantly decreased in groups B and C compared to sham-operated group. Preservation solution containing PACAP-38 ameliorated bowel tissue oxidative injury induced by cold ischemia and reperfusion. Histological results showed that preservation caused destruction of the mucous, submucous, and muscular layers, which were further deteriorated by the end of reperfusion. In contrast, PACAP-38 significantly protected the intestinal structure. Ischemia/reperfusion decreased the endogenous PACAP-38 concentration in the intestinal tissue. Administration of PACAP-38 mitigated the oxidative injury and histological lesions in small-bowel autotransplantation model.
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[Neoadjuvant radiochemotherapy in the treatment of locally advanced rectal tumors].
Magy Onkol
PUBLISHED: 02-02-2009
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We investigated the response rate and side effects of simultaneous, neoadjuvant radiochemotherapy (RCT) in locally advanced rectal cancer. Between 2005 and 2007, we treated 112 patients in stage II-III rectal carcinoma at the Institute of Oncotherapy, University of Pécs. For staging abdomino-pelvic CT (112) and transrectal US (49) or pelvic MR (10), or PET-CT (1) was performed. Radiation therapy was delivered with 3D CRT-based technique using belly-board with 18 MV photon energy, while patients in prone position. A total dose of 45 Gy (single dose 1.8 Gy) was delivered to the tumor and the pelvic lymph nodes. 5-FU and Ca-folinate was administered concomitantly in the 1st and 5th week of radiotherapy. Four weeks after delivering neoadjuvant RCT the patients control CT was evaluated according to RECIST criteria. RCT was followed by surgery in 6-9 weeks. We graded the histology using the Mandard regression score system. Side effects were registered using CTCAE v 3.0. Grade 1, 2 or 3 acute gastrointestinal toxicity occurred in 12%, grade 3 hematological toxicity in 9.5% of the patients. The response rate determined by using control CT was 64.85%. According to the Mandard regression score, TRG1 occurred in 15%, TRG2 in 30.4%, TRG3 in 28%, TRG4 in 24% and TRG5 in 2.6% of the cases. Radical surgery was performed in 89 cases, 72 with R0 resection. By assessing the histological samples we found downstaging in 46% of the T and 34.5% of the N stage. We have no information on increased postoperative complications. We followed 86 patients after neoadjuvant therapy. Until March 2009 there was no progression in 48 of our patients. In 13 cases local relapse occurred, and in 25 cases the disease progressed because of distant metastasis, although local control was maintained. 10 patients had local relapse and distant metastases. 17 patients passed away. As a conclusion, neoadjuvant RCT of Stage II-III patients is an effective and well tolerated treatment, allowing for high R0 resection rate and bearing no higher risk for postoperative morbidity.
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Resistance training with soy vs whey protein supplements in hyperlipidemic males.
J Int Soc Sports Nutr
PUBLISHED: 01-05-2009
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Most individuals at risk for developing cardiovascular disease (CVD) can reduce risk factors through diet and exercise before resorting to drug treatment. The effect of a combination of resistance training with vegetable-based (soy) versus animal-based (whey) protein supplementation on CVD risk reduction has received little study. The studys purpose was to examine the effects of 12 weeks of resistance exercise training with soy versus whey protein supplementation on strength gains, body composition and serum lipid changes in overweight, hyperlipidemic men.
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[Differential scanning calorimetry of blood plasma in breast cancer patients].
Magy Onkol
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Breast cancer is the commonest cause of cancer death in women worldwide. Its incidence has been increasing for many years in economically developed countries. Differential scanning calorimetry (DSC) is a thermoanalytical technique which monitors small heat changes between sample and reference materials. This examination is a validly efficient method for the demonstration of structural changes not only in the physical sciences, but in numerous human oncological diseases. The goal of this study was to measure DSC thermogram of blood plasma in breast cancer patients with different stages. Nineteen women with different tumor diameter (0.5-7.5 mm) and with or without regional lymph node metastases were involved in the study. Preoperatively peripheral blood samples were collected from the patients and from healthy controls, and plasma components were analysed by SETARAM micro DSC-II calorimeter. The diameter of the tumor tissue and the number of metastatic lymph nodes were evaluated on the basis of postoperative histological results. In the current study we found difference in changes of the thermal parameters (transition temperature, calorimetric enthalpy) of breast cancer patients plasma components. Moreover, a tendency has been found for association of these results with tumor size and with the degree of regional lymph node involvement. Preliminary study of the clinical utility of DSC technology arises, even though there is no data in the literature. In cases of breast cancer the blood plasma may be suitable for DSC analysis for diagnosis or staging as well. In order to clarify the relationships we are planning further studies.
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The flavonoid isoquercitrin promotes neurite elongation by reducing RhoA activity.
PLoS ONE
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Neurite formation and synaptic patterning are fundamental to the development of a functional nervous system. Flavonoids are natural molecules known for having beneficial effects on brain health through diverse molecular pathways. Cytoskeletal changes occurring during neuritogenesis and synapse formation often involve Rho GTPases. Here we hypothesized that the flavonoid isoquercitrin promotes neuronal differentiation through Rho signalling.
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The tumour suppressor DiRas3 interacts with C-RAF and downregulates MEK activity to restrict cell migration.
Biol. Cell
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The mitogenic pathway, composed of RAF kinases, mitogen-activated protein kinase kinases (MEK) and extracellular signal-regulated kinases (ERK), promotes cell proliferation and migration and is upregulated in many tumours. DiRas3 (ARHI, Noey2), a mainly GTP-bound Ras-like protein with an unusual N-terminal extension, is predominantly lost in ovarian and breast cancers. Its re-expression in these tissues impairs cell proliferation, autophagy, apoptosis and cell migration. Further, loss of DiRas3 correlates with an increase in growth factor-induced ERK phosphorylation. Therefore, DIRAS3 proves to be a curious gene with remarkable tumour suppressing capabilities. However, how DiRas3 interferes with ERK phosphorylation, has remained unknown.
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[Functional proctology at the University of Pécs].
Magy Seb
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Functional proctological investigations have been introduced at Pécs University of Sciences 15 years ago. The Pelvic Floor Multidisciplinary Team has been re-launched after many years of pause in 2010. Experience of the team in the treatment of faecal incontinence and obstructed defecation syndrome is discussed.
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[Minimally invasive technique as the gold standard of adrenal surgery].
Magy Seb
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Minimal invasive surgery of the adrenal gland is a "gold standard" procedure worldwide. Authors compare operative data to a historical control group retrospectively analyzing an almost 15 years period.
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[Experiences with central pancreatectomy].
Magy Seb
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The authors report their experience with central pancreatectomy and also summarize relevant literature data.
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[Reconstruction of the esophagus with plastic surgery techniques].
Magy Seb
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Various plastic surgery techniques were applied for oesophageal reconstruction in complicated cases. Myocutaneous flaps that are suitable to cover soft tissue defects of the neck may also be transferred and used for partial defects of the cervical oesophagus or securing a vulnerable suture line. Application of microsurgical techniques may also be useful in certain situations.
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[The role of neoadjuvant therapy in the treatment of locally advanced squamous cell cancer of the cervical oesophagus].
Magy Seb
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Cervical oesophagus represents a critical location for squamous cell carcinoma, which usually requires extensive surgery (pharyngo-laryngo-oesophagectomy). In the last decade, neoadjuvant chemo-radiotherapy was reported to be beneficial in the treatment of locally advanced squamous cell oesophageal cancer.
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What is Visualize?

JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

How does it work?

We use abstracts found on PubMed and match them to JoVE videos to create a list of 10 to 30 related methods videos.

Video X seems to be unrelated to Abstract Y...

In developing our video relationships, we compare around 5 million PubMed articles to our library of over 4,500 methods videos. In some cases the language used in the PubMed abstracts makes matching that content to a JoVE video difficult. In other cases, there happens not to be any content in our video library that is relevant to the topic of a given abstract. In these cases, our algorithms are trying their best to display videos with relevant content, which can sometimes result in matched videos with only a slight relation.