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Find video protocols related to scientific articles indexed in Pubmed.
Smoothened gene alterations in keratocystic odontogenic tumors.
Head Face Med
PUBLISHED: 09-05-2014
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It has been widely demonstrated that the hedgehog pathway is strongly associated with basal cell carcinoma of the skin (NBCCS). To assess potential DNA alterations related to keratocystic odontogenic tumors (KCOTs), we sequenced smoothened (SMO) genes in 12 sporadic KCOTs.
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Seed targeting with tiny anti-miR-155 inhibits malignant progression of multiple myeloma cells.
J Drug Target
PUBLISHED: 09-04-2014
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Abstract Background: miR-155 acts as a ubiquitous oncogene in major classes of human cancers and is a potential target for therapeutic intervention. However, the role of miR-155 in multiple myeloma is poorly understood. Methods: To explore the role of miR-155 in multiple myeloma, we assessed the influence of tiny seed-targeting anti-miR-155 (t-anti-miR-155) on multiple myeloma cell line (RPMI-8266) viability and apoptosis in vitro. Results: t-anti-miR-155 significantly inhibited multiple myeloma cell proliferation, migration, and colony formation. Additionally, t-anti-miR-155 significantly increased CD19 positive cell numbers, which are novel biomarkers for multiple myeloma and suppressor of cytokine signaling 1(SOCS1) was shown to be a target gene for miR-155 in multiple myeloma. Finally, the miR-155 signaling pathway was investigated by KEGG assay. Conclusion: miR-155 in RPMI-8266 cells is a critical oncomiR in multiple myeloma and seed-targeting t-anti-miR-155 might be a novel strategy for miR-155-based therapeutics.
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Pyridoxine-derived organoselenium compounds with glutathione peroxidase-like and chain-breaking antioxidant activity.
Chemistry
PUBLISHED: 08-14-2014
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One of the vitamin B6 vitamers, pyridoxine, was modified to incorporate selenium in various oxidation states in place of the methyl group in position 2. Such compounds were conveniently accessed by treatment of bis-4,5-(carboethoxy)-2-iodo-3-pyridinol with disodium diselenide and LiAlH4 -reduction. After work-up, selone 7 was isolated in good yield as an air-stable crystalline material. Hydrogen bonding to the neighboring hydroxyl group, as revealed by the short intramolecular Se???H distance in the crystal structure is likely to provide extra stabilization to the compound. Computational studies showed that selone 7 is more stable than the corresponding selenol tautomer by 12.2?kcal?mol(-1) . Hydrogen peroxide oxidation of the selone 7 afforded diselenide 12, and, on further oxidation, seleninic acid 13. Treatment of the seleninic acid with thiophenol provided an isolable selenosulfide 14. The glutathione peroxidase-like properties of the pyridoxine-derived compounds were assessed by using the coupled reductase method. Seleninic acid 13 was found to be twofold more active than ebselen. The chain-breaking capacity of the pyridoxine compounds were studied in a water/chlorobenzene membrane model containing linoleic acid as an oxidizable substrate and N-acetylcysteine as a thiol reducing agent. Diselenide 15 could match ?-tocopherol when it comes to reactivity towards peroxyl radicals and inhibition time.
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miR-29b suppresses proliferation, migration, and invasion of tongue squamous cell carcinoma through PTEN-AKT signaling pathway by targeting Sp1.
Oral Oncol.
PUBLISHED: 08-07-2014
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miR-29b has been implicated in various cancers. However, the role of miR-29b in tongue squamous cell carcinoma (TSCC) remains unclear. This study aimed to investigate the role of miR-29b in TSCC progression.
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[Theoretical study on fluorescence spectra of four kinds of p-substituted curcumin analogues].
Guang Pu Xue Yu Guang Pu Fen Xi
PUBLISHED: 07-11-2014
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Four kinds of p-substituted curcumin analogues were optimized at B3LYP/6-31G (d, p) level. On this basis, the excited states geometry structure was optimized by the CIS method, and finally the fluorescence emission spectra were calculated through the TD-DFT method. The results showed that: the four compounds, a large conjugated system, is preferably coplanar structure. Because of introducing hydroxyl and halogen atom on the benzene ring, the molecular pi-electron conjugation is relatively larger, emission wavelength is relatively longer, and fluorescence spectra show different degrees of red shift. As the electron donating group is hydroxy, the fluorescence phenomenon is more obviously red shifted.
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Polycondensation of polymer brushes via DNA hybridization.
J. Am. Chem. Soc.
PUBLISHED: 07-09-2014
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Triblock copolymer brushes were functionalized with nucleic acid sequences, which allowed the polymers to connect head-to-tail and form supramolecular nanostructures. Two approaches were designed and implemented, using either a palindromic DNA attached to both ends of the polymer or two different DNA sequences attached regiospecifically. Given appropriate conditions, the DNA-brush conjugates self-assembled to form either nanoworms with length up to several microns or cross-linked networks. This process is analogous to the step-growth polymerization of small molecule monomers.
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Analytic study of traveling-wave velocity variation in line-focusing schemes for plasma x-ray lasers.
Appl Opt
PUBLISHED: 06-13-2014
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Efficient amplification of coherent short-wavelength pulses along a plasma gain column requires traveling-wave excitation with the sweep velocity matched to the signal group velocity. Through simulations incorporating the gain dynamics of the system, we show that the group velocity is not constant but increases monotonically along the line focus due to strong saturation. We demonstrate a line-focusing configuration that results in traveling wave excitation with the sweep velocity well matched to the spatially varying group velocity. Moreover, we show through numerical simulations that the improved velocity matching yields a significant improvement in signal amplification.
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Changes of gray matter volume and amplitude of low-frequency oscillations in amnestic MCI: An integrative multi-modal MRI study.
Acta Radiol
PUBLISHED: 05-06-2014
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Numerous studies have reported that the amnestic-type mild cognitive impairment (aMCI) patients have impaired brain structural integrity and functional alterations separately.
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Laparoscopic spleen-preserving distal pancreatectomy for pancreatic neoplasms: A retrospective study.
World J. Gastroenterol.
PUBLISHED: 03-30-2014
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To describe the clinical characteristics, technical procedures, and outcomes of patients undergoing laparoscopic spleen-preserving distal pancreatectomy (LSPDP) for benign and malignant pancreatic neoplasms.
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Integrative analysis of differential miRNA and functional study of miR-21 by seed-targeting inhibition in multiple myeloma cells in response to berberine.
BMC Syst Biol
PUBLISHED: 02-18-2014
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Berberine is a natural alkaloid derived from a traditional Chinese herbal medicine. It is known to modulate microRNA (miRNA) levels, although the mechanism for this action is unknown. Here, we previously demonstrate that the expression of 87 miRNAs is differentially affected by berberine in multiple myeloma cells. Among 49 miRNAs that are down-regulated, nine act as oncomirs, including miR-21. Integrative analysis showed that 28 of the down-regulated miRNAs participate in tumor protein p53 (TP53) signaling and other cancer pathways. miR-21 is involved in all these pathways, and is one of the most important oncomirs to be affected by berberine in multiple myeloma cells.
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Seed-targeting anti-miR-21 inhibiting malignant progression of retinoblastoma and analysis of their phosphorylation signaling pathways.
Exp. Eye Res.
PUBLISHED: 02-09-2014
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MiR-21 acts as a ubiquitous oncogene in major classes of human cancers and is a potential target for therapeutic intervention. However, the relative expression of miR-21 in retinoblastoma is poorly understood. Here we detected miR-21 expression in HXO-RB44 cell line human normal retinal tissues and retinoblastoma (Rb) tissue specimens, and studied its function using an 8-mer tiny seed-targeting anti-miR-21 (t-anti-miR-21). RT-PCR revealed that miR-21 was highly overexpressed in HXO-RB44 cells and Rb tissue specimens compared with normal human retinal tissues. The localization and transfection efficiency of t-anti-miR-21 and the cell cycle distribution were detected by confocal microscopy and flow cytometry. In addition, we found that t-anti-miR-21 led to a significant inhibition of retinoblastoma cell proliferation, migration and colony formation in vitro, with a similar effect to anti-miR-21. Anti-miR-21 down-regulated the miR-21 level, whereas both 8-mer t-anti-miR-21 and 15-mer m-anti-miR-21 had no impact on miR-21 expression levels. Finally, the phosphorylation signaling pathway, down-regulated by t-anti-miR-21, was integrated by KEGG assay, which elucidated the potential mechanisms of inhibition of miR-21 in retinoblastoma. Taken together, knockdown of miR-21 in the HXO-RB44 cell is capable of inhibiting cancer progression in retinoblastoma. Seed-targeting t-anti-miR-21 was a novel strategy for mir-21-based therapeutics and drug discovery.
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The large intracellular loop of ptch1 mediates the non-canonical Hedgehog pathway through cyclin B1 in nevoid basal cell carcinoma syndrome.
Int. J. Mol. Med.
PUBLISHED: 01-16-2014
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Mutations in the transmembrane receptor patched homolog 1 (Homo sapiens) (ptch1) are responsible for nevoid basal cell carcinoma syndrome (NBCCS), an autosomal dominant disorder that causes developmental abnormalities and predisposes the affected individuals to cancer. Many of these mutations, including mutations in the C-terminus of the large intracellular loop (ICL) of ptch1 (p.C727VfsX745 and p.S733IfsX736), result in the premature truncation of the protein. The ptch1?C727VfsX745 and ptch1-S733IfsX736 mutations have been identified in patients with NBCCS?associated keratocystic odontogenic tumors (KCOTs). In the present study, we found that the molecular mechanisms regulated by the non-canonical Hedgehog (Hh) signaling pathway through cyclin B1 are involved in the pathogenesis of NBCCS-associated KCOTs. In contrast to wild-type ptch1, ptch1-C727VfsX745 and ptch1?S733IfsX736 clearly exhibited reduced binding to cyclin B1. Moreover, the cells expressing these two mutations demonstrated an increase in cell cycle progression and these two mutation constructs failed to inhibit cell proliferation. In addition, the mutants enhanced the activity of glioma-associated oncogene family zinc finger 1 (GLI1), a downstream reporter of Hh signaling. Thus, our data suggest that the non-canonical Hh pathway mediated through ptch1 and cyclin B1 is involved in the pathogenesis of NBCCS-associated KCOTs. The C-terminus of ICL in ptch1 may also be a potential therapeutic target in the treatment of this disease.
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A 21-locus autosomal SNP multiplex and its application in forensic science.
J. Forensic Sci.
PUBLISHED: 01-10-2014
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To develop a cost-effective technique for single-nucleotide polymorphism (SNP) genotyping and improve the efficiency to analyze degraded DNA, we have established a novel multiplex system including 21-locus autosomal SNPs and amelogenin locus, which was based on allele-specific amplification (ASA) and universal reporter primers (URP). The target amplicons for each of the 21 SNPs arranged from 63 base pair (bp) to 192 bp. The system was tested in 539 samples from three ethnic groups (Han, Mongolian, and Zhuang population) in China, and the total power of discrimination (TPD) and cumulative probability of exclusion (CPE) were more than 0.99999999 and 0.98, respectively. The system was further validated with forensic samples and full profiles could be achieved from degraded DNA and 63 case-type samples. In summary, the multiplex system offers an effective technique for individual identification of forensic samples and is much more efficient in the analysis of degraded DNA compared with standard STR typing.
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An aptamer-based electrochemical biosensor for the detection of Salmonella.
J. Microbiol. Methods
PUBLISHED: 01-07-2014
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Salmonella is one of the most common causes of food-associated disease. An electrochemical biosensor was developed for Salmonella detection using a Salmonella-specific recognition aptamer. The biosensor was based on a glassy carbon electrode modified with graphene oxide and gold nanoparticles. Then, the aptamer ssDNA sequence could be linked to the electrode. Each assembly step was accompanied by changes to the electrochemical parameters. After incubation of the modified electrode with Salmonella, the electrochemical properties between the electrode and the electrolyte changed accordingly. The electrochemical impedance spectrum was measured to quantify the Salmonella. The results revealed that, when more Salmonella were added to the reaction system, the current between the electrode and electrolyte decreased; in other words, the impendence gradually increased. A detection limit as low as 3 cfu/mL was obtained. This novel method is specific and fast, and it has the potential for real sample detection.
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The complete mitochondrial genomes of six species of tetranychus provide insights into the phylogeny and evolution of spider mites.
PLoS ONE
PUBLISHED: 01-01-2014
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Many spider mites belonging to the genus Tetranychus are of agronomical importance. With limited morphological characters, Tetranychus mites are usually identified by a combination of morphological characteristics and molecular diagnostics. To clarify their molecular evolution and phylogeny, the mitochondrial genomes of the green and red forms of Tetranychus urticae as well as T. kanzawai, T. ludeni, T. malaysiensis, T. phaselus, T. pueraricola were sequenced and compared. The seven mitochondrial genomes are typical circular molecules of about 13,000 bp encoding and they are composed of the complete set of 37 genes that are usually found in metazoans. The order of the mitochondrial (mt) genes is the same as that in the mt genomes of Panonychus citri and P. ulmi, but very different from that in other Acari. The J-strands of the mitochondrial genomes have high (?84%) A+T contents, negative GC-skews and positive AT-skews. The nucleotide sequence of the cox1 gene, which is commonly used as a taxon barcode and molecular marker, is more highly conserved than the nucleotide sequences of other mitochondrial genes in these seven species. Most tRNA genes in the seven genomes lose the D-arm and/or the T-arm. The functions of these tRNAs need to be evaluated. The mitochondrial genome of T. malaysiensis differs from the other six genomes in having a slightly smaller genome size, a slight difference in codon usage, and a variable loop in place of the T-arm of some tRNAs by a variable loop. A phylogenic analysis shows that T. malaysiensis first split from other Tetranychus species and that the clade of the family Tetranychoidea occupies a basal position in the Trombidiformes. The mt genomes of the green and red forms of T. urticae have limited divergence and short evolutionary distance.
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miR-34a inhibits migration and invasion of tongue squamous cell carcinoma via targeting MMP9 and MMP14.
PLoS ONE
PUBLISHED: 01-01-2014
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miR-34a is an important tumor suppressor gene in various cancer types. But little is known about the dysregulation of miR-34a in tongue squamous cell carcinoma (TSCC). In this study, we investigate the expression and potential role of miR-34a in TSCC.
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Laparoscopic resection of synchronous gastric cancer and primary small intestinal lymphoma: a case report.
World J. Gastroenterol.
PUBLISHED: 01-01-2014
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Synchronous gastric cancer and primary small intestinal lymphoma are extremely rare. A 49-year-old woman was referred to our hospital with a history of upper abdominal pain for two weeks and was diagnosed with synchronous cancer. During hospitalization, the patient underwent laparoscopic distal gastrectomy + resection of bilateral ovaries + partial resection of both small intestine and descending colon. Pathological examination revealed a synchronous cancer consisting of early gastric cancer with poorly differentiated adenocarcinoma located in mucosa, with lymph node metastasis (3+/29) (T1N1M0, stage IB); and diffuse large B cell lymphoma of small intestine involving descending colon and bilateral ovaries, with lymph node metastasis (2+/5) (Ann Arbor IIE). The patient recovered well, without any obvious complications and was discharged on post-operative day 7. The patient received six cycles of chemotherapy after operation. She has been doing well with no evidence of recurrence for 13 mo.
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Low-dose formaldehyde delays DNA damage recognition and DNA excision repair in human cells.
PLoS ONE
PUBLISHED: 01-01-2014
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Formaldehyde is still widely employed as a universal crosslinking agent, preservative and disinfectant, despite its proven carcinogenicity in occupationally exposed workers. Therefore, it is of paramount importance to understand the possible impact of low-dose formaldehyde exposures in the general population. Due to the concomitant occurrence of multiple indoor and outdoor toxicants, we tested how formaldehyde, at micromolar concentrations, interferes with general DNA damage recognition and excision processes that remove some of the most frequently inflicted DNA lesions.
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[Theoretical study on nuclear magnetic resonance spectra of the four kinds of curcumin analogues].
Guang Pu Xue Yu Guang Pu Fen Xi
PUBLISHED: 12-28-2013
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Abstract The structure of four kinds of curcumin analogues was optimized at the level of B3LYP/6-31G(d, p), under which the stability was verified by means of vibration analysis. Moreover, NMR spectra of urcumin analogues compounds were studied at the level of B3LYP/6-311G(d,p) by GIAO method. The results show that the structure of four kinds of compounds, a larger conjugated system, has good planarity. Because of introducing hydroxyl and methoxy, the compound-B/C/D-C3, C4 and compoud-A and compound-D-Cs have greater 8 value. delta value of compound-A-C4. C4 is relatively smaller, and delta value of C3 is relatively larger. In the conjugated carbonyl compounds, compared with the acetaldehyde delta value (201 ppm), carbonyl C13 delta value (183 ppm) decreases relatively, C(11, 15) (alpha-carbon) delta value(122 ppm) decreases relatively, and C(9, 17) (beta-carbon) delta value(145 ppm) increases relatively. Finally, the correlation between experimental delta value and theoretical delta value of the 1H NMR was analyzed through the linear regression method. Results show that they have good correlation, and the experimental values coincide with the theoretical values.
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[The diagnosis and treatment of pancreatic neuroendocrine neoplasms].
Zhonghua Wai Ke Za Zhi
PUBLISHED: 12-17-2013
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To analyze the prognostic factors of pancreatic neuroendocrine neoplasms (PNEN).
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Catalytic antioxidants: regenerable tellurium analogues of vitamin e.
Org. Lett.
PUBLISHED: 11-26-2013
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In an effort to improve the chain-breaking capacity of the natural antioxidants, an octyltelluro group was introduced next to the phenolic moiety in ?- and ?-tocopherol. The new vitamin E analogues quenched peroxyl radicals more efficiently than ?-tocopherol and were readily regenerable by aqueous N-acetylcysteine in a simple membrane model composed of a stirring chlorobenzene/water two-phase system. The novel tocopherol analogues could also mimic the action of the glutathione peroxidase enzymes.
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VEGF depletion enhances bcr-abl-specific sensitivity of arsenic trioxide in chronic myelogenous leukemia.
Hematology
PUBLISHED: 10-17-2013
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The development of resistance to imatinib mesylate may partly depend on high bcr-abl expression levels or point mutation(s). Arsenic trioxide (ATO) has bcr-abl suppressing activity in vitro, without cross-resistance to imatinib. Meanwhile, bcr-abl also induces expression of vascular endothelial growth factor (VEGF), which is associated with tumor-related angiogenesis and is involved in chronic myelogenous leukemia (CML) pathogenesis. Here, we investigated ways to improve ATO activity in CML by modulating cellular VEGF levels. K562 and primary CML cells were transfected with a VEGF antisense sequence. Cell viability and survival were assessed using 3-(4,5-dimethylthiazol-2-yl-2,5-diphenyltetrazolium bromide and trypan blue exclusion assays. Apoptotic cells were detected by flow cytometry following annexin V and propidium iodide staining. The results showed that VEGF depletion effectively promotes enhanced ATO antileukemic activity by repressing bcr-abl protein levels. These data provide a rationale for the clinical development of optimized ATO-based regimens that incorporate VEGF modulator for CML treatment.
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[Establishment of acute myocardial infarction model in diabetic miniature pigs through video-assisted thoracoscopic surgery].
Zhonghua Yi Xue Za Zhi
PUBLISHED: 10-16-2013
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To explore a new method of establishing acute myocardial infarction model in diabetic miniature pigs through video-assisted thoracoscopic surgery (VATS).
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Temperature-activated nucleic acid nanostructures.
J. Am. Chem. Soc.
PUBLISHED: 09-16-2013
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DNA and poly(N-isopropylacrylamide) are co-assembled onto gold nanoparticles. The DNA sequences can be reversibly exposed or hidden from the polymer surface in response to temperature cues, thereby translating the temperature trigger to the on-off switching of the surface chemistry and function. When exposed by heating (?30 °C), the DNA rapidly hybridizes to complementary strands, and chain-end biotin groups become readily accessible, while at lower temperatures these activities are largely blocked.
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[Different biological characteristics between nucleus pulposus and annulus fibrosus cells in rabbits].
Zhongguo Gu Shang
PUBLISHED: 09-11-2013
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To compare biological characteristics between nucleus pulposus and annulus fibrosus cells in vitro model.
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[Relationship between vitamin D and autism spectrum disorder].
Zhongguo Dang Dai Er Ke Za Zhi
PUBLISHED: 08-23-2013
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Autism spectrum disorder (ASD) is a complex neurodevelopmental disorder, with multiple genetic and environmental risk factors. The interplay between genetic and environmental factors has become the subject of intensified research in the last several years. Vitamin D deficiency has recently been proposed as a possible environmental risk factor for ASD. Vitamin D has a unique role in brain homeostasis, embryogenesis and neurodevelopment, immunological modulation (including the brains immune system), antioxidation, antiapoptosis, neural differentiation and gene regulation. Children with ASD had significantly lower serum levels of 25-hydroxy vitamin D than healthy children.Therefore vitamin D deficiency during pregnancy and early childhood may be an environmental trigger for ASD.
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Association of serotonin transporter polymorphisms with responsiveness to adrenocorticotropic hormone in infantile spasm.
World J Pediatr
PUBLISHED: 06-17-2013
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Serotonin or 5-hydroxytryptamine (5-HT) is an important neurotransmitter in the central nervous system. The serotonin transporter (5-HTT) is a key regulator of the level of serotonergic neurotransmission. In the present study, the contribution of 5-HTT polymorphisms to the risk of infantile spasm (IS) and the responsiveness to adrenocorticotropic hormone (ACTH) were investigated.
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In search of catalytic antioxidants--(alkyltelluro)phenols, (alkyltelluro)resorcinols, and bis(alkyltelluro)phenols.
J. Org. Chem.
PUBLISHED: 06-11-2013
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The quenching of peroxyl radicals by ortho-(alkyltelluro)phenols occurs by a more complex mechanism than formal H-atom transfer. In an effort to improve on this concept, we have prepared (alkyltelluro)resorcinols and bis(alkyltelluro)phenols and evaluated their catalytic chain-breaking and preventive antioxidative properties. The in situ formed trianion produced from 2-bromophenol and 3 equiv of tert-butyllithium was allowed to react with dialkyl ditellurides to provide ortho-(alkyltelluro)phenols in low yields. 2-Bromoresorcinols after treatment with 4 equiv of tert-butyllithium similarly afforded 2-(alkyltelluro)resorcinols. Bis(alkyltelluro)phenols were accessed by allowing the trianion produced from the reaction of 2,6-dibromophenol with 5 equiv of tert-butyllithium to react with dialkyl ditellurides. The novel phenolic compounds were found to inhibit azo-initiated peroxidation of linoleic acid much more efficiently than ?-tocopherol in a two-phase peroxidation system containing excess N-acetylcysteine as a stoichiometric thiol reducing agent in the aqueous phase. Whereas most of the (alkyltelluro)phenols and resorcinols could inhibit peroxidation for only 89-228 min, some of the bis(alkyltelluro)phenols were more regenerable and offered protection for >410 min. The novel (alkyltelluro)phenols were also evaluated for their capacity to catalyze reduction of hydrogen peroxide in the presence of thiophenol (glutathione peroxidase-like activity). (Alkyltelluro)resorcinols 7a-c were the most efficient catalysts with activities circa 65 times higher than those recorded for diphenyl diselenide.
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Anisotropic growth shapes intestinal tissues during embryogenesis.
Proc. Natl. Acad. Sci. U.S.A.
PUBLISHED: 06-10-2013
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Embryogenesis offers a real laboratory for pattern formation, buckling, and postbuckling induced by growth of soft tissues. Each part of our body is structured in multiple adjacent layers: the skin, the brain, and the interior of organs. Each layer has a complex biological composition presenting different elasticity. Generated during fetal life, these layers will experience growth and remodeling in the early postfertilization stages. Here, we focus on a herringbone pattern occurring in fetal intestinal tissues. Common to many mammalians, this instability is a precursor of the villi, finger-like projections into the lumen. For avians (chicks and turkeys embryos), it has been shown that, a few days after fertilization, the mucosal epithelium of the duodenum is smooth, and then folds emerge, which present 2 d later a pronounced zigzag instability. Many debates and biological studies are devoted to this specific morphology, which regulates the cell renewal in the intestine. After reviewing experimental results about duodenum morphogenesis, we show that a model based on simplified hypothesis for the growth of the mesenchyme can explain buckling and postbuckling instabilities. Being completely analytical, it is based on biaxial compressive stresses due to differential growth between layers and it predicts quantitatively the morphological changes. The growth anisotropy increasing with time, the competition between folds and zigzags, is proved to occur as a secondary instability. The model is compared with available experimental data on chicks duodenum and can be applied to other intestinal tissues, the zigzag being a common and spectacular microstructural pattern of intestine embryogenesis.
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Laparoscopic vs open distal pancreatectomy for solid pseudopapillary tumor of the pancreas.
World J. Gastroenterol.
PUBLISHED: 06-08-2013
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To compare short- and long-term outcomes of laparoscopic vs open distal pancreatectomy for solid pseudopapillary tumor (SPT) of the pancreas.
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[Polymorphisms of (CAG)n and(GGN)n repeats of androgen receptor gene among ethnic Hui and Han Chinese from Ningxia].
Zhonghua Yi Xue Yi Chuan Xue Za Zhi
PUBLISHED: 06-08-2013
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To compare the distribution of (CAG)n and (GGN)n repeats polymorphisms of androgen receptor (AR) gene between Hui and Han ethnic Chinese from Ningxia.
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Azastilbenes: a cut-off to p38 MAPK inhibitors.
Org. Biomol. Chem.
PUBLISHED: 05-31-2013
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Inhibitors with vicinal 4-fluorophenyl/4-pyridine rings on a five- or six-membered heterocyclic ring are known to inhibit the p38 mitogen-activated protein kinase (MAPK), which is a potential target for rheumatoid arthritis and several different types of cancer. Several substituted azastilbene-based compounds with vicinal 4-fluorophenyl/4-pyridine rings were designed using computational docking, synthesized, and evaluated in a cell-free radiometric p38? assay. The biochemical evaluation shows that the best inhibition (down to 110 nM) is achieved for azastilbene-based compounds having an isopropylamine substituent in the 2-position of the pyridine ring. The inhibition of p38 signaling in human breast cancer cells was observed for two of the compounds.
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[The assessment of general movements: a reliable tool for predicting the neurodevelopment of preterm infants in an very early phase].
Zhongguo Dang Dai Er Ke Za Zhi
PUBLISHED: 04-24-2013
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Cerebral palsy (CP) is a permanent disorder in the development of movement and posture in the developing infant brain and is one of the major disabilities that result from extremely preterm birth. Early identification of possible neurodevelopmental injury offers the opportunity to deliver intervention at a very early age and thus prevent severe disability. The assessment of general movements (GMs), has emerged as a reliable and valid predictor of severe neurologic deficits in infants. This method is based on a visual Gestalt perception of the quality of GMs in the preterm and term periods, and postterm up to 5 months. The quality of "fidgety movements" is the most valuable marker for predicting neurologic outcomes.
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Virus-induced gene silencing of PEAM4 affects floral morphology by altering the expression pattern of PsSOC1a and PsPVP in pea.
J. Plant Physiol.
PUBLISHED: 04-21-2013
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pea-MADS4 (PEAM4) regulates floral morphology in Pisum sativum L., however, its molecular mechanisms still remain unclear. Virus-induced gene silencing (VIGS) is a recently developed reverse genetic approach that facilities an easier and more rapid study of gene functions. In this study, the PEAM4 gene was effectively silenced by VIGS using a pea early browning virus (PEBV) in wild type pea JI992. The infected plants showed abnormal phenotypes, as the floral organs, especially the sepals and petals changed in both size and shape, which made the corolla less closed. The petals changed in morphology and internal symmetry with, the stamens reduced and carpel dehisced. Larger sepals and longer tendrils with small cauline leaves appeared, with some sepals turning into bracts, and secondary inflorescences with fused floral organs were formed, indicating a flower-to-inflorescence change. The infected plants also displayed a delayed and prolonged flowering time. The PEAM4-VIGS plants with altered floral morphology were similar to the pim (proliferating inflorescence meristem) mutant and also mimicked the phenotypes of ap1 mutants in Arabidopsis. The expression pattern of the homologous genes PsSOC1a and PsSVP, which were involved in flowering time and florescence morphological control downstream of PEAM4, were analyzed by real-time RT-PCR and mRNA in situ hybridization. PsSOC1a and PsSVP were ectopically expressed and enhanced in the floral meristems from PEAM4-silenced plants. Our data suggests that PEAM4 may have a similar molecular mechanism as AtAP1, which inhibits the expression of PsSOC1a and PsSVP in the floral meristem from the early stages of flower development. As such, in this way PEAM4 plays a crucial role in maintaining floral organ identity and flower development in pea.
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[The clinical comparison of totally laparoscopic versus open total gastrectomy for gastric cancer].
Zhonghua Wai Ke Za Zhi
PUBLISHED: 04-13-2013
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To investigate the feasibility, safety and oncological effect of totally laparoscopic total gastrectomy (TLTG).
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[Effect of infra-low-frequency transcranial magnetic stimulation on motor function in children with spastic cerebral palsy].
Zhongguo Dang Dai Er Ke Za Zhi
PUBLISHED: 03-19-2013
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To study the therapeutic effects of infra-low-frequency transcranial magnetic stimulation in children with spastic cerebral palsy.
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Perovskite LaTiO?-Ag0.2 nanomaterials for nonenzymatic glucose sensor with high performance.
Biosens Bioelectron
PUBLISHED: 03-07-2013
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In this paper, a nonenzymatic glucose biosensor based on perovskite LaTiO3-Ag0.2(LTA) modified electrode was presented. The morphology and the composition of the perovskite LaTiO?-Ag0.2 nanomaterials were characterized by using scanning electron microscopy (SEM) and X-ray diffraction (XRD) respectively. The LaTiO?-Ag0.2(LTA) composite was investigated by electrochemical characterization using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under optimal conditions, CV and chronoamperometry (I-t) study revealed that, compared with the bare glassy carbon electrode (GCE), the modified electrode showed a remarkable increase in the efficiency of the electrocatalytic oxidation of glucose, starting at around +0.70 V (vs. Ag/AgCl). The prepared sensor exhibited a high sensitivity of 784.14 µAmM?¹ cm?², a low detection limit of 2.1×10?? M and a wide linear range from 2.5 µM to 4 mM (R=0.9997). More importantly, the LTA modified electrode was also relatively insensitive to commonly interfering species such as ascorbic acid (AA), uric acid (UA), dopamine (DA) in high potential. Moreover, the nonenzymatic sensor was applied to the determination of glucose in human serum samples and the results were in good agreement with clinical data. Electrodes modified with perovskite nanomaterials are highly promising for nonenzymatic electrochemical detection of glucose because of their high sensitivity, fast response, excellent stability and good reproducibility.
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MicroRNA regulation of adipose derived stem cells in aging rats.
PLoS ONE
PUBLISHED: 02-14-2013
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Perturbations in abdominal fat secreted adipokines play a key role in metabolic syndrome. This process is further altered during the aging process, probably due to alterations in the preadipocytes (aka. stromal vascular fraction cells-SVF cells or adipose derived stem cells-ASCs) composition and/or function. Since microRNAs regulate genes involved both in development and aging processes, we hypothesized that the impaired adipose function with aging is due to altered microRNA regulation of adipogenic pathways in SVF cells.
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Turning pyridoxine into a catalytic chain-breaking and hydroperoxide-decomposing antioxidant.
J. Org. Chem.
PUBLISHED: 02-04-2013
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Vitamin B6 is involved in a variety of enzymatic transformations. Some recent findings also indicate an antioxidant role of the vitamin in biological systems. We set out to turn pyridoxine (1a) into a catalytic chain-breaking and hydroperoxide-decomposing antioxidant by replacing the 2-methyl substituent with an alkyltelluro group. Target molecules 12 and derivatives 14, 17, 18, and 20 thereof were accessed by subjecting suitably substituted 2-halopyridin-3-ols to aromatic substitution using sodium alkanetellurolates as nucleophiles and then LAH-reduction of ester groups. The novel pyridoxine compounds were found to inhibit azo-initiated peroxidation of linoleic acid an order of magnitude more efficiently than ?-tocopherol in a water/chlorobenzene two-phase system containing N-acetylcysteine as a reducing agent in the aqueous phase. The most lipid-soluble pyridoxine derivative 20c was regenerable and could inhibit peroxidation for substantially longer time (>410 min) than ?-tocopherol (87 min). The chalcogen-containing pyridoxines could also mimic the action of the glutathione peroxidase enzymes. Thus, compound 20a catalyzed reduction of hydrogen peroxide three times more efficiently than Ebselen in the presence of glutathione as a stoichiometric reducing agent.
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Pharmacophore modeling, virtual screening, and molecular docking studies for discovery of novel Akt2 inhibitors.
Int J Med Sci
PUBLISHED: 01-23-2013
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Akt2 is considered as a potential target for cancer therapy. In order to find novel Akt2 inhibitors which have different scaffolds, structure-based pharmacophore model and 3D-QSAR pharmacophore model were built and validated by different methods. Then, they were used for chemical databases virtual screening. The selected compounds were further analyzed and refined using drug-like filters and ADMET analysis. Finally, seven hits with different scaffolds were picked out for docking studies. These seven hits were predicted to have high inhibitory activity and good ADMET properties, they may act as novel leads for Akt2 inhibitors designing.
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Effect of octreotide surface density on receptor-mediated endocytosis in vitro and anticancer efficacy of modified nanocarrier in vivo after optimization.
Int J Pharm
PUBLISHED: 01-14-2013
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The objective of the present work was to investigate the optimum density of octreotide on the surface of nanostructured lipid carriers (NLC) loaded with hydroxycamptothencine (HCPT) to enhance receptor-mediated endocytosis and tumor targeting selectivity. Different amounts of octreotide-polyethylene glycol (100) monostearate (OPMS), a ligand for somatostatin receptors (SSTRs), were coupled into NLC. In vitro evaluation of OPMS modified NLCs (O-NLCs) was done by studying the physicochemical properties, drug release, cellular uptake and cytotoxicity. Whereas in vivo evaluation was done by studying the tissue distribution in S180 tumor-bearing mice through ex vivo fluorescence imaging and HCPT quantitative study. The results showed that O-NLCs with an average size of ?100 nm possessed obvious sustained release. When OPMS was used in the amount of 5 ?mol (O?-NLC) highest cellular uptake, cytotoxicity in SMMC-7721 cell line and remarkable accumulation in S180 tumor were observed. The treatments of O?-NLC brought about significant tumor inhibition and prolonged the median survival time as compared with HCPT, unmodified NLC and the pegylated NLC (P?-NLC) groups. It appears that to achieve a more rational approach of receptor mediated tumor targeted drug delivery system the surface density of the targeting moiety on the surface of nanocarriers should be considered.
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Prognostic implications of micoRNA miR-195 expression in human tongue squamous cell carcinoma.
PLoS ONE
PUBLISHED: 01-11-2013
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miR-195 is aberrantly expressed in multiple types of disease. But little is known about the dysregulation of miR-195 in tongue squamous cell carcinoma (TSCC). In this study, we investigated the roles of miR-195 in the development and progression of TSCC.
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Clinical outcome of endoprosthetic replacement for failed treatment of intertrochanteric fractures: A retrospective case series.
Pak J Med Sci
PUBLISHED: 01-10-2013
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Objective: The treatment methods for the failed internal fixation in elderly patients suffering from several osteoporostic fractures are still inconclusive. We aimed to evaluate the clinical effects of endoprosthetic replacement for failure treatment of intertrochanteric fracture. Methodology: A total of 13 patients with failed internal fixation for intertrochanteric fracture were collected between January 2002 and October 2009. All of them were treated with endoprosthetic replacement and followed up till October 2010. Four of them received total hip replacement and the remained nine received artificial bipolar femoral head replacement. Clinical and functional outcomes of patients were assessed. Results: Of 13 patients, nine were females and four were males with the mean age of 76.5 years (SD, 11.7, range, 58-92 years) at the time of fracture. The average time of operation and follow-up was 124 minutes (89-187minutes) and 31 months (14-68 months), respectively. The average blood loss during the operation was 631 ml (450-1560 ml). All patients showed good pain relief and functional improvement. Final post-operative Harris and WOMAC scores were significantly improved from pre-operative levels (P<0.05). Only five patients showed operative complications. Conclusions: Our finding indicated that endoprosthetic replacement is an effective salvage procedure for failed internal fixation of intertrochanteric fracture in elderly patients with effective pain relief and functional improvement as well as few serious complications.
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Differentiated embryonic chondrocyte-expressed gene 1 is associated with hypoxia-inducible factor 1? and Ki67 in human gastric cancer.
Diagn Pathol
PUBLISHED: 01-09-2013
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Gastric cancer is a leading causes of cancer-related deaths ,but the underlying molecular mechanisms of its progression are largely unknown. Differentiated embryonic chondrocyte-expressed gene 1 (DEC1), is an important transcription factor involved in the progression of tumors and has recently been identified to be strongly inducible by hypoxia. Little is known about the contribution of DEC1 to the intracellular hypoxia and proliferation signaling events in gastric cancer.
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Efficient extraction method to collect sugar from sweet sorghum.
J Biol Eng
PUBLISHED: 01-08-2013
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Sweet sorghum is a domesticated grass containing a sugar-rich juice that can be readily utilized for ethanol production. Most of the sugar is stored inside the cells of the stalk tissue and can be difficult to release, a necessary step before conventional fermentation. While this crop holds much promise as an arid land sugar source for biofuel production, a number of challenges must be overcome. One lies in the inherent labile nature of the sugars in the stalks leading to a short usable storage time. Also, collection of sugars from the sweet sorghum stalks is usually accomplished by mechanical squeezing, but generally does not collect all of the available sugars.
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Downregulation and altered function of natural killer cells in hepatitis B virus patients treated with entecavir.
Clin. Exp. Pharmacol. Physiol.
PUBLISHED: 01-03-2013
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The aim of the present study was to investigate the natural killer (NK) cell phenotype and function in chronic hepatitis B virus (HBV) patients and to study the effects of entecavir therapy (10 mg/day, p.o.) on these responses. Peripheral blood NK cells were collected from 18 chronic HBV patients and 14 healthy controls. The effect of entecavir therapy on the phenotype and function of NK cells in chronic HBV patients was characterized by flow cytometry analysis. Concentrations of alanine aminotransferase (ALT) and aspartate aminotransferase (AST), HBV viral loads in both groups and potential associations between the frequency of peripheral NK cell subsets and clinical measures were determined. There was a significant reduction in the number of CD3(-)CD56(+) NK cells in chronic HBV patients compared with healthy controls. Furthermore, there were significant increases in the percentage of CD3(-)CD56(+)NKG2D(+) and CD3(-)CD56(+)NKP30(+) NK activating receptors in chronic HBV patients compared with healthy individuals, who exhibited downregulated expression following entecavir treatment. Spearmans correlation analysis revealed that there was a significant positive correlation between the percentage of NKG2D(+) and NKP30(+) NK cells and serum ALT levels. Characterization of NK cell degranulation indicated that the frequency of CD107a(+) NK cells in HBV patients (in response to K562 stimulation) was significantly greater than in healthy controls but decreased following entecavir treatment. Entecavir treatment of hepatitis B e antigen-positive chronic HBV-infected patients not only led to a reduction in HBV DNA loads and normalization of ALT and AST levels, but also resulted in the recovery of NK cell-mediated immunity.
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Effect of blast exposure on the brain structure and cognition in Macaca fascicularis.
J. Neurotrauma
PUBLISHED: 11-07-2011
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Blast injury to the brain is one of the major causes of death and can also significantly affect cognition and physical and psychological skills in survivors of blast. The complex mechanisms via which blast injury causes impairment of cognition and other symptoms are poorly understood. In this study, we investigated the effects of varying degrees of primary blast overpressure (BOP; 80 and 200?kPa) on the pathophysiological and magnetic resonance imaging (MRI) changes and neurocognitive performance as assessed by the monkey Cambridge Neuropsychological Test Automated Battery (mCANTAB) in non-human primates (NHP). The study aimed to examine the effects of neurobehavioral and histopathological changes in NHP. MRI and histopathology revealed ultrastructural changes in the brain, notably in the Purkinje neurons in the cerebellum and pyramidal neurons in the hippocampus, which were most vulnerable to the blast. The results correlated well with the behavioral changes and changes in motor coordination and working memory of the affected monkeys. In addition, there was white matter damage affecting myelinated axons, astrocytic hypertrophy, and increased aquaporin-4 (AQP-4) expression in astrocytes, suggesting cerebral edema. Increased apoptosis appeared to involve astrocytes and oligodendrocytes in the animals following blast exposure. The small sample size could have contributed to the non-significant outcome in cognitive performance post-blast and limited quantitative analyses. Nevertheless, the study has provided initial descriptive changes for establishing a primary BOP threshold for brain injury to serve as a useful platform for future investigations that aim to estimate brain injury potential and set safe limits of exposure.
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Green tea drinking habits and gastric cancer in southwest China.
Asian Pac. J. Cancer Prev.
PUBLISHED: 10-31-2011
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The purpose of this study was to investigate relationships between green tea consumption and gastric cancer development.
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High-resolution, two-dimensional measurement of dissolved reactive phosphorus in sediments using the diffusive gradients in thin films technique in combination with a routine procedure.
Environ. Sci. Technol.
PUBLISHED: 10-26-2011
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Dissolved reactive phosphorus (DRP) is the most available P form in sediments and often directly controls phytoplankton blooms in aquatic systems. In this study, a novel procedure was developed for two-dimensional (2D) measurement of DRP in sediments at a spatial resolution of 0.45 mm using the diffusive gradients in thin films (DGT) technique with a revised high-capacity binding phase (Zr oxide gel). This procedure involves DGT uptake of P in sediments, 2D slicing of the binding gel on a 0.45 × 0.45-mm grid system, elution of P from each gel square with 1 M NaOH, and microcolorimetric determination of DRP in each eluted solution using 384-microwell plates. Measurements of DRP via this procedure were tested in homogeneous solutions and sediments and produced an acceptable error (<20% relative standard deviation) for the analysis once the accumulated mass of P in each gel square reached 1.2 ?g cm(-2). This method was successfully applied to produce 2D images of the DRP distribution in sediments with and without the influence of tubificid worm bioturbation, revealing a much more pronounced and localized impact from tubificid worms than that found using a one-dimensional measurement of pore water DRP concentrations at 1-cm resolution.
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[(2R,3S,5R)-3-Acet-oxy-5-(5-formyl-2,4-dioxo-1,2,3,4-tetra-hydro-pyrimidin-1-yl)-2,3,4,5-tetra-hydro-furan-2-yl]methyl acetate.
Acta Crystallogr Sect E Struct Rep Online
PUBLISHED: 09-24-2011
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In the two independent but very similar mol-ecules (A and B) of the title compound, C(14)H(16)N(2)O(8), both six-membered pyrimidine rings are nearly planar [maximum deviations = 0.010?(3)?Å in A and 0.028?(3)?Å in B]. The five-membered furan-ose ring in mol-ecule A adopts an envelope conformation, while the same ring in mol-ecule B has a twisted conformation. In the crystal, the A mol-ecules are linked via a pair of inter-molecular N-H?O hydrogen bonds, forming dimers. Each A mol-ecule is further linked to a B mol-ecule via a second N-H?O hydrogen bond. There are also a number of C-H?·O inter-actions present, leading to the formation of a three-dimensional network.
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[Long-term treatment outcome in patients undergoing cricohyoidoepiglottopexy for glottic carcinoma].
Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi
PUBLISHED: 09-09-2011
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To investigate the long-term results of cricohyoidoepiglottopexy(CHEP) in the treatment of glottic carcinoma.
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[Polymorphic analysis of 5 Y-SNP loci in Han population of Jinan].
Fa Yi Xue Za Zhi
PUBLISHED: 09-09-2011
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To investigate polymorphism distribution of the 5 Y-SNP loci in Jinan Han population, and evaluate their potential in forensic application.
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Bis[1,3-bis(1-propyl-1H-benzimidazol-2-yl)-2-oxapropane]-cadmium(II) dipicrate dimethyl-formamide monosolvate.
Acta Crystallogr Sect E Struct Rep Online
PUBLISHED: 09-07-2011
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In the title compound, [Cd(C(22)H(26)N(4)O)(2)](C(6)H(2)N(3)O(7))(2)·C(3)H(7)NO, the Cd(II) ion is coordinated by four N atoms and two O atoms from two tridentate 1,3-bis-(1-propyl-1H-benzimidazol-2-yl)-2-oxopropane ligands in a distorted octa-hedral coordination environment. There are significant differences in the chemically equivalent Cd-O bond lengths [2.618?(2)?Å and 2.561?(2)?Å].
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Synthesis and characterization of the ligand based on benzimidazole and its copper complex: DNA binding and antioxidant activity.
Bioinorg Chem Appl
PUBLISHED: 07-29-2011
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A new copper(II) complex with formulae of [Cu(buobb)(2)](pic)(2), where buobb stands for the ligand of 1,3-bis(1- butylbenzimidazol-2-yl)-2-oxopropane and pic represents 2,4,6-trinitrophenol, has been synthesized and characterized by elemental analyses, molar conductivity, IR, UV-Vis spectra measurements, and cyclic voltammetry. The crystal structure of the copper(II) complex has been determined by X-ray single-crystal diffraction. The coordination environment around each copper(II) atom can be described as a distorted octahedral geometry. The ?-? stacking interactions link the copper(II) complex into a 1D infinite network. The interactions of the ligand and the copper(II) complex with calf thymus DNA (CT-DNA) are investigated by using electronic absorption titration, ethidium bromide-DNA displacement experiments, and viscosity measurements. Additionally, the copper(II) complexs antioxidant properties have been investigated in vitro.
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A V-shaped ligand 1,3-bis(1-methylbenzimidazol-2-yl)-2-oxapropane and its Cu(II) complex: synthesis, crystal structure, antioxidation and DNA-binding properties.
J. Photochem. Photobiol. B, Biol.
PUBLISHED: 07-28-2011
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A six-coordinate copper(II) complex with the ligand 1,3-bis(1-methylbenzimidazol-2-yl)-2-oxopropane (Meobb), with composition [Cu(Meobb)(2)](NO(3))(2)·2CH(3)OH, has been synthesized and characterized by elemental analysis, electrical conductivities, IR, UV-Vis spectral measurements. A study of the electro-chemistry of the copper(II) complex was carried out by using cyclic voltammetry. The molecular structures of the ligand Meobb and the Cu(II) complex were determined by X-ray crystal diffraction. The DNA-binding modes of the ligand and the complex were investigated by electronic absorption titration, ethidium bromide-DNA displacement experiments and viscosity measurements. The experimental evidence indicated the compounds interact with calf thymus DNA through intercalation. Additionally, the Cu(II) complex exhibited potential antioxidant properties in in vitro studies.
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Regulation of nucleotide excision repair by UV-DDB: prioritization of damage recognition to internucleosomal DNA.
PLoS Biol.
PUBLISHED: 06-03-2011
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How tightly packed chromatin is thoroughly inspected for DNA damage is one of the fundamental unanswered questions in biology. In particular, the effective excision of carcinogenic lesions caused by the ultraviolet (UV) radiation of sunlight depends on UV-damaged DNA-binding protein (UV-DDB), but the mechanism by which this DDB1-DDB2 heterodimer stimulates DNA repair remained enigmatic. We hypothesized that a distinctive function of this unique sensor is to coordinate damage recognition in the nucleosome repeat landscape of chromatin. Therefore, the nucleosomes of human cells have been dissected by micrococcal nuclease, thus revealing, to our knowledge for the first time, that UV-DDB associates preferentially with lesions in hypersensitive, hence, highly accessible internucleosomal sites joining the core particles. Surprisingly, the accompanying CUL4A ubiquitin ligase activity is necessary to retain the xeroderma pigmentosum group C (XPC) partner at such internucleosomal repair hotspots that undergo very fast excision kinetics. This CUL4A complex thereby counteracts an unexpected affinity of XPC for core particles that are less permissive than hypersensitive sites to downstream repair subunits. That UV-DDB also adopts a ubiquitin-independent function is evidenced by domain mapping and in situ protein dynamics studies, revealing direct but transient interactions that promote a thermodynamically unfavorable ?-hairpin insertion of XPC into substrate DNA. We conclude that the evolutionary advent of UV-DDB correlates with the need for a spatiotemporal organizer of XPC positioning in higher eukaryotic chromatin.
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Manipulation of cracks in three-dimensional colloidal crystal films via recognition of surface energy patterns: an approach to regulating crack patterns and shaping microcrystals.
Langmuir
PUBLISHED: 06-01-2011
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A new concept for dealing with cracks in colloidal crystals has been proposed. We induce the cracks rather than eliminate them via templates that possess hydrophilic/hydrophobic patterns on the surface (surface energy patterns), leading the cracks to propagate along the predetermined lines. Colloidal crystal arrays with various kinds of element figures separated by cracks could be reproducibly fabricated. Diverse crack patterns other than common stripes have been observed, and the mechanism of these behaviors has been explored. The factors that influence the crack density have been investigated to ensure that the templates could function effectively. Moreover, we obtained microcrystal blocks with specific shapes, detached from the substrate.
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1-Methyl-2-({[(1-methyl-1H-benzimid-azol-2-yl)meth-yl](phen-yl)amino}-meth-yl)1H-benzimidazol-3-ium picrate.
Acta Crystallogr Sect E Struct Rep Online
PUBLISHED: 05-30-2011
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In the title molecular salt, C(24)H(24)N(5) (+)·C(6)H(2)N(3)O(7) (-), the dihedral angle between the benzimidazole rings of the cation is 5.041?(2)°. In the anion, the three nitro groups make dihedral angles of 2.468?(3), 12.795?(3) and 24.958?(4)° with respect to the central ring. In the crystal, weak aromatic ?-? stacking [centroid-centroid distance = 3.599?(15)?Å] consolidates the packing. In addition, an intra-molecular N-H?N hydrogen bond is observed.
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Synthesis, Crystal Structure, and Spectra Properties of the Cadmium (II) Complex with Bis(N-allylbenzimidazol-2-ylmethyl)benzylamine.
Bioinorg Chem Appl
PUBLISHED: 05-27-2011
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A novel complex of cadmium (II) picrate (pic) with V-shaped ligand bis(N-allylbenzimidazol-2-ylmethyl)benzylamine (babb), with composition [Cd(babb)(2)](pic)(2), was synthesized and characterized by elemental analyses and electrical conductivity, IR, and UV/visible spectra. The crystal structure of the complex has been determined by the single-crystal X-ray diffraction. In the complex, the coordination sphere around Cd (II) is distorted octahedral, six nitrogen atoms involved in coordination afforded by two tridentate ligand babb. Moreover, The DNA-binding properties of the ligand babb and Cd (II) complex were investigated by spectrophotometric methods and viscosity measurements, and the results suggest that they bind to DNA via an intercalation binding mode, and the Cd (II) complex shows higher affinity than the ligand.
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Synthesis, Crystal Structure, and DNA-Binding Studies of a Nickel(II) Complex with the Bis(2-benzimidazolymethyl)amine Ligand.
Bioinorg Chem Appl
PUBLISHED: 05-20-2011
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A V-shaped ligand Bis(2-benzimidazolymethyl)amine (bba) and its nickel(II) picrate (pic) complex, with composition [Ni(bba)(2)](pic)(2)·3MeOH, have been synthesized and characterized on the basis of elemental analyses, molar conductivities, IR spectra, and UV/vis measurements. In the complex, the Ni(II) ion is six-coordinated with a N(2)O(4) ligand set, resulting in a distorted octahedron coordination geometry. In addition, the DNA-binding properties of the Ni(II) complex have been investigated by electronic absorption, fluorescence, and viscosity measurements. The experimental results suggest that the nickel(II) complex binds to DNA by partial intercalation binding mode.
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Bis[N,N-bis-(1-allyl-1H-benzimidazol-2-ylmethyl-?N)benzyl-amine-?N]cadmium dipicrate.
Acta Crystallogr Sect E Struct Rep Online
PUBLISHED: 05-16-2011
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The crystal structure of the title compound, [Cd(C(29)H(29)N(5))(2)](C(6)H(2)N(3)O(7))(2), consists of Cd(II) complex cations and picrate anions. In the complex cation, the Cd(II) ion is chelated by two bis-(1-allyl-benzimidazol-2-ylmeth-yl)benzyl-amine (babb) ligands in a distorted octa-hedral geometry. Extensive C-H?O hydrogen bonding occurs between cations and anions in the crystal structure.
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Bis(nitrato-?O)(3-oxapentane-1,5-diamine-?N,O,N)zinc(II).
Acta Crystallogr Sect E Struct Rep Online
PUBLISHED: 05-09-2011
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In the title compound, [Zn(NO(3))(2)(C(4)H(12)N(2)O)], the Zn(II) atom is N,O,N-chelated by a 3-oxapentane-1,5-diamine ligand and is further coordinated by two nitrate anions in a distorted trigonal-bipyramidal geometry. Inter-molecular N-H?O hydrogen bonding is present in the crystal structure. A short O?O contact of 2.816?(8)?Å is observed between the nitrate anions of adjacent mol-ecules.
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Atherogenic ?-6 Lipids Modulate PPAR- EGR-1 Crosstalk in Vascular Cells.
PPAR Res
PUBLISHED: 04-30-2011
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Atherogenic ?-6 lipids are physiological ligands of peroxisome proliferator-activated receptors (PPARs) and elicit pro- and antiatherogenic responses in vascular cells. The objective of this study was to investigate if ?-6 lipids modulated the early growth response-1 (Egr-1)/PPAR crosstalk thereby altering vascular function. Rat aortic smooth muscle cells (RASMCs) were exposed to ?-6 lipids, linoleic acid (LA), or its oxidized form, 13-HPODE (OxLA) in the presence or absence of a PPAR? antagonist (MK886) or PPAR? antagonist (GW9662) or PPAR-specific siRNA. Our results demonstrate that ?-6 lipids, induced Egr-1 and monocyte chemotactic protein-1 (MCP-1) mRNA and protein levels at the acute phase (1-4?hrs) when PPAR? was downregulated and at subacute phase (4-12?hrs) by modulating PPAR?, thus resulting in altered monocyte adhesion to RASMCs. We provide novel insights into the mechanism of action of ?-6 lipids on Egr-1/PPAR interactions in vascular cells and their potential in altering vascular function.
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A multiscale modeling approach to investigate molecular mechanisms of pseudokinase activation and drug resistance in the HER3/ErbB3 receptor tyrosine kinase signaling network.
Mol Biosyst
PUBLISHED: 04-20-2011
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Multiscale modeling provides a powerful and quantitative platform for investigating the complexity inherent in intracellular signaling pathways and rationalizing the effects of molecular perturbations on downstream signaling events and ultimately, on the cell phenotype. Here we describe the application of a multiscale modeling scheme to the HER3/ErbB3 receptor tyrosine kinase (RTK) signaling network, which regulates critical cellular processes including proliferation, migration and differentiation. The HER3 kinase is a topic of current interest and investigation, as it has been implicated in mechanisms of resistance to tyrosine kinase inhibition (TKI) of EGFR and HER2 in the treatment of many human malignancies. Moreover, the commonly regarded status of HER3 as a catalytically inactive pseudokinase has recently been challenged by our previous study, which demonstrated robust residual kinase activity for HER3. Through our multiscale model, we investigate the most significant molecular interactions that contribute to potential mechanisms of HER3 activity and the physiological relevance of this activity to mechanisms of drug resistance in an ErbB-driven tumor cell in silico. The results of our molecular-scale simulations support the characterization of HER3 as a weakly active kinase that, in contrast to its fully-active ErbB family members, depends upon a unique hydrophobic interface to coordinate the alignment of specific catalytic residues required for its activity. Translating our molecular simulation results of the uniquely active behavior of the HER3 kinase into a physiologically relevant environment, our HER3 signaling model demonstrates that even a weak level of HER3 activity may be sufficient to induce AKT signaling and TKI resistance in the context of an ErbB signaling-dependent tumor cell, and therefore therapeutic targeting of HER3 may represent a superior treatment strategy for specific ErbB-driven cancers.
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[Radioactivity seeds interstitial brachytherapy treating malignant salivary gland tumors].
Beijing Da Xue Xue Bao
PUBLISHED: 04-20-2011
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To detect the efficacy of (125)I radioactive seeds implanting treating malignant salivary gland tumors.
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Bis[1,3-bis-(1-methyl-1H-benzimidazol-2-yl)-2-oxapropane]-cadmium dipicrate acetonitrile sesquisolvate 0.25-hydrate.
Acta Crystallogr Sect E Struct Rep Online
PUBLISHED: 04-15-2011
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In the title compound, [Cd(C(18)H(18)N(4)O)(2)](C(6)H(2)N(3)O(7))(2)·1.5CH(3)CN·0.25H(2)O, the Cd(II) ion is coordinated by four N atoms and two O atoms from two tridentate 1,3-bis-(1-methyl-1H-benzimidazol-2-yl)-2-oxopropane ligands in a distorted octa-hedral coordination environment. The lengths of the chemically equivalent Cd-O bonds [2.4850?(16) and 2.5488?(16)Å] are signiificantly different. One of the picrate anions is disordered over two sets of sites, with refined occupancies of 0.504?(15) and 0.496?(15). A 0.5-occupancy acetonitrile solvent mol-ecule is disordered over two sites with equal occupancies. The H atoms of a 0.25-occupancy solvent water mol-ecule were neither located nor included in the refinement.
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Bis[1,3-bis-(1-ethyl-1H-benzimidazol-2-yl)-2-oxapropane]-cadmium(II) dipicrate dimethyl-formamide disolvate.
Acta Crystallogr Sect E Struct Rep Online
PUBLISHED: 03-29-2011
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In the title compound, [Cd(C(20)H(22)N(4)O)(2)](C(6)H(2)N(3)O(7))(2)·2C(3)H(7)NO, the Cd(II) ion is coordinated by four N atoms and two O atoms from two tridentate 1,3-bis-(1-ethyl-1H-benzimid-azol-2-yl)-2-oxapropane ligands in a distorted octa-hedral environment.
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Functional characterization of the CKRC1/TAA1 gene and dissection of hormonal actions in the Arabidopsis root.
Plant J.
PUBLISHED: 03-01-2011
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Cytokinin (CK) influences many aspects of plant growth and development, and its function often involves intricate interactions with other phytohormones such as auxin and ethylene. However, the molecular mechanisms underlying the role of CK and its interactions with other growth regulators are still poorly understood. Here we describe the isolation and characterization of the Arabidopsis CK-induced root curling 1 (ckrc1) mutant. CKRC1 encodes a previously identified tryptophan aminotransferase (TAA1) involved in the indole-3-pyruvic acid (IPA) pathway of indole-3-acetic acid (IAA) biosynthesis. The ckrc1 mutant exhibits a defective root gravitropic response (GR) and an increased resistance to CK in primary root growth. These defects can be rescued by exogenous auxin or IPA. Furthermore, we show that CK up-regulates CKRC1/TAA1 expression but inhibits polar auxin transport in roots in an AHK3/ARR1/12-dependent and ethylene-independent manner. Our results suggest that CK regulates root growth and development not only by down-regulating polar auxin transport, but also by stimulating local auxin biosynthesis.
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Surface wrinkling patterns on a core-shell soft sphere.
Phys. Rev. Lett.
PUBLISHED: 02-09-2011
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The three-dimensional patterns of surface wrinkling on a core-shell soft sphere are investigated through buckling and postbuckling analyses under differential tissue growth or shrinkage. With increasing deformation, the sphere first exhibits a buckyball-like wrinkling pattern and then undergoes a wrinkle-to-fold transition into labyrinth folded patterns, in agreement with experimental observations. This transition involves dynamic movement, rotation, and coalescence of polygons formed during the initial buckling.
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JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

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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.