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In JoVE (1)
- Tredimensionell cellkulturmodell för mätning av effekterna av interstitialvätska Flow på Tumörcellinvasion
Other Publications (13)
- Zhong Yao Cai = Zhongyaocai = Journal of Chinese Medicinal Materials
- British Journal of Pharmacology
- Journal of Alternative and Complementary Medicine (New York, N.Y.)
- Cardiology in the Young
- World Journal of Surgical Oncology
- Oncology Reports
- Molecules (Basel, Switzerland)
- The Journal of Biological Chemistry
- Nature Structural & Molecular Biology
- Journal of Cancer Research and Clinical Oncology
- The Journal of Pathology
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Articles by Shafei Wang in JoVE
Tredimensionell cellkulturmodell för mätning av effekterna av interstitialvätska Flow på Tumörcellinvasion
Alimatou M. Tchafa, Arpit D. Shah, Shafei Wang, Melissa T. Duong, Adrian C. Shieh
School of Biomedical Engineering, Science and Health Systems, Drexel University
Interstitial vätska flöde är förhöjd i fasta tumörer och kan modulera tumörcellsinvasion. Här beskriver vi en metod att applicera interstitiell fluidflöde till celler inbäddade i en matris och sedan mäta dess effekt på cellinvasion. Denna teknik kan lätt anpassas för att studera andra system.
Other articles by Shafei Wang on PubMed
Zhong Yao Cai = Zhongyaocai = Journal of Chinese Medicinal Materials. Feb, 2012 | Pubmed ID: 22822675
To investigate the effect of Grape Seed Proanthocyanidins (GSPs) on enhancing the radiosensitivity of human hepatic carcinoma cell line HepG2, human cervical cancer cell line Hela and human leukemia cell line K562 for X-ray in vitro.
Curcumin Promotes Cardiac Repair and Ameliorates Cardiac Dysfunction Following Myocardial Infarction
British Journal of Pharmacology. Jul, 2012 | Pubmed ID: 22823335
Curcumin, the natural yellow pigment extracted from the rhizomes of the plant curcuma longa, has been demonstrated to exhibit a variety of potent beneficial effects, acting as an antioxidant, anti-inflammatory and anti-fibrotic. In this study we tested the hypothesis that curcumin attenuates maladaptive cardiac repair and improves cardiac function after ischaemia and reperfusion by reducing degradation of extracellular matrix (ECM) and inhibiting synthesis of collagens via TGFβ/Smad-mediated signalling pathway.
Does Traditional Chinese Medicine Pattern Affect Acupoint Specific Effect? Analysis of Data from a Multicenter, Randomized, Controlled Trial for Primary Dysmenorrhea
Journal of Alternative and Complementary Medicine (New York, N.Y.). Jul, 2012 | Pubmed ID: 22823583
Abstract Objectives: This study assessed the importance of the Traditional Chinese Medicine (TCM) pattern on an acupoint-specific effect. Design: This was a TCM pattern subdivision analysis of the first intervention data from a multicenter, randomized, controlled trial (ISRCTN24863192) (the main trial). Settings: The main trial recruited participants from six hospitals in three provinces in China. Subjects: Five hundred and one (501) participants diagnosed with primary dysmenorrhea (PD) were enrolled in the main trial. Interventions: The main trial randomly and equally divided participants into three treatment groups with bilateral electroacupuncture at three sites, respectively: Sanyinjiao (SP6), Xuanzhong (GB39), and an adjacent nonacupoint. Participants were diagnosed with TCM patterns before the treatment. The intervention was carried out when the visual analogue scale (VAS) score of participant's menstrual pain was ≥40 mm on the first day of menstruation and lasted for 30 minutes. Outcome measures: The immediate improvement of pain was measured with a 100-mm VAS before the intervention, at 5 minutes, 10 minutes, and 30 minutes during the intervention, and at 30 minutes after the completion of this intervention. Results: Three (3) TCM patterns (n=320) were eligible for analysis, including Cold and Dampness Stagnation pattern (n=184), Qi and Blood Stagnation pattern (n=84), and Qi and Blood Deficiency pattern (n=52). In Cold and Dampness Stagnation pattern, the SP6 group had a significant reduction in VAS scores compared with the GB39 group (mean difference -7.6 mm) and the nonacupoint group (mean difference -8.2 mm), respectively. There was no difference between the latter two groups. There were no group differences in VAS scores in the other two patterns. Conclusions: It suggested that TCM pattern might affect acupoint specific effect on the immediate pain relief obtained for participants with PD.
Cardiac Performance and Quality of Life in Patients Who Have Undergone the Fontan Procedure with and Without Prior Superior Cavopulmonary Connection
Cardiology in the Young. Jul, 2012 | Pubmed ID: 22824161
BACKGROUND: A superior cavopulmonary connection is commonly performed before the Fontan procedure in patients with a functionally univentricular heart. Data are limited regarding associations between a prior superior cavopulmonary connection and functional and ventricular performance late after the Fontan procedure. METHODS: We compared characteristics of those with and without prior superior cavopulmonary connection among 546 subjects enrolled in the Pediatric Heart Network Fontan Cross-Sectional Study. We further compared different superior cavopulmonary connection techniques: bidirectional cavopulmonary anastomosis (n equals 229), bilateral bidirectional cavopulmonary anastomosis (n equals 39), and hemi-Fontan (n equals 114). RESULTS: A prior superior cavopulmonary connection was performed in 408 subjects (75%); the proportion differed by year of Fontan surgery and centre (p-value less than 0.0001 for each). The average age at Fontan was similar, 3.5 years in those with superior cavopulmonary connection versus 3.2 years in those without (p-value equals 0.4). The type of superior cavopulmonary connection varied by site (p-value less than 0.001) and was related to the type of Fontan procedure. Exercise performance, echocardiographic variables, and predominant rhythm did not differ by superior cavopulmonary connection status or among superior cavopulmonary connection types. Using a test of interaction, findings did not vary according to an underlying diagnosis of hypoplastic left heart syndrome. CONCLUSIONS: After controlling for subject and era factors, most long-term outcomes in subjects with a prior superior cavopulmonary connection did not differ substantially from those without this procedure. The type of superior cavopulmonary connection varied significantly by centre, but late outcomes were similar.
World Journal of Surgical Oncology. Jul, 2012 | Pubmed ID: 22824621
Castleman disease (CD) is an uncommon benign lymphoproliferative disorder, which usually presents as solitary or multiple masses in the mediastinum. Peripancreatic CD was rarely reported. Herein, we report two cases of unicentric peripancreatic CD from our center. A 43-year-old man and a 58-year-old woman were detected to have a pancreatic mass in the routine medical examinations. Both of them were asymptomatic. The computed tomography and ultrasonographic examination revealed a mild enhancing solitary mass at the pancreatic head/neck. No definite preoperative diagnosis was established and Whipple operations were originally planned. The intraoperative frozen section diagnosis of both patients revealed lymphoproliferation. Then the local excisions of mass were performed. Histological examination revealed features of CD of hyaline-vascular type. No recurrence was found during the follow-up period. CD should be included in the differential diagnosis of pancreatic tumors. Local excision is a suitable surgical choice.
Chromatin State and MicroRNA Determine Different Gene Expression Dynamics Responsive to TNF Stimulation
Genomics. Jul, 2012 | Pubmed ID: 22824656
Gene expression is a dynamic process, and what factors influence gene expression changes upon external stimulus have not been clearly understood. We studied gene expression profiles in human umbilical vein endothelial cells (HUVEC) after the Tumor Necrosis Factor (TNF) stimulus, and found that: the promoters of fast-response up-regulated genes were enriched with several "active" chromatin markers like H3K27ac and H3K4me3, and also preferentially bound by Pol II and c-Myc; the core-promoter regions of slow-response up-regulated genes were frequently occupied by nucleosomes; down-regulated genes were more intensively regulated by microRNAs. Moreover, the Gene Ontology and motif analysis of the promoter regions revealed that gene clusters with different response behaviors had different functions and were regulated by different sets of transcription factors. Our observations suggested that the different gene expression patterns upon external stimulus were regulated by a combination of multi-layer regulators.
Oncology Reports. Jul, 2012 | Pubmed ID: 22824926
The purpose of this study was to investigate the potential roles of the SH3-containing guanine nucleotide exchange factor (SGEF) in human prostate cancer. Experimental data showed that SGEF was overexpressed in human prostate cancer cells and specimens. The reduction of SGEF expression through an SGEF-targeting siRNA in androgen-independent C4-2 and C4-2B cells suppressed both anchorage-dependent and anchorage-independent growth. In addition, the androgen receptor (AR) antagonist bicalutamide further strengthened this inhibitory effect due to the suppression of the elevated AR transactivation after knockdown of SGEF. Collectively, our results provide the first demonstration that SGEF is a novel promoter of human prostate cancer progression and development.
Ultrasound-promoted One-pot, Three-component Synthesis of Spiro[indoline-3,1'-pyrazolo[1,2-b]phthalazine] Derivatives
Molecules (Basel, Switzerland). 2012 | Pubmed ID: 22825620
A series of 3'-aminospiro[indoline-3,1'-pyrazolo[1,2-b]phthalazine]-2,5',10'-trione derivatives have been synthesized by a one-pot three-component reaction of isatin, malononitrile or ethyl cyanoacetate and phthalhydrazide catalyzed by piperidine under ultrasound irradiation. For comparison the reactions were carried out under both conventional and ultrasonic conditions. In general, improvement in rates and yields were observed when the reactions were carried out under sonication compared with classical conditions.
The AT-rich DNA-binding Protein SATB2 Promotes Expression and Physical Association of Human Gγ- and Aγ-Globin Genes
The Journal of Biological Chemistry. Jul, 2012 | Pubmed ID: 22825848
Matrix attachment region (MAR)-binding protein (MARBP) has profound influence on gene transcriptional control by tethering genes to the nuclear scaffold. MARBP SATB2 is recently known as a versatile regulator functioning in the differentiation of multiple cell types including embryonic stem cells, osteoblasts and immunocytes. Roles of SATB2 in erythroid cells and its working mechanism in orchestrating target gene expression are largely unexplored. We show here that SATB2 is expressed in erythroid cells and activates γ-globin genes by binding to MARs in their promoters and recruiting histone acetylase PCAF. Further analysis in higher-order chromatin structure shows that SATB2 affects physical proximity of human (G)γ- and (A)γ-globin promoters via self-association. We also found that SATB2 interacts with SATB1, which specifically activates ε-globin gene expression. Our results establish SATB2 as a novel γ-globin gene regulator and provide a glimpse of the differential and cooperative roles of SATB family proteins in modulating clustered genes transcription and mediating higher-order chromatin structures.
5-formylcytosine and 5-carboxylcytosine Reduce the Rate and Substrate Specificity of RNA Polymerase II Transcription
Nature Structural & Molecular Biology. Jul, 2012 | Pubmed ID: 22820989
Although the roles of 5-methylcytosine and 5-hydroxymethylcytosine in epigenetic regulation of gene expression are well established, the functional effects of 5-formylcytosine and 5-carboxylcytosine on the process of transcription are not clear. Here we report a systematic study of the effects of five different forms of cytosine in DNA on mammalian and yeast RNA polymerase II transcription, providing new insights into potential functional interplay between cytosine methylation status and transcription.
Combined Erlotinib and Cetuximab Overcome the Acquired Resistance to Epidermal Growth Factor Receptors Tyrosine Kinase Inhibitor in Non-small-cell Lung Cancer
Journal of Cancer Research and Clinical Oncology. Jul, 2012 | Pubmed ID: 22821179
PURPOSE: Non-small-cell lung cancer (NSCLC) cells with somatic mutations in epidermal growth factor receptors (EGFR) are initially susceptible to tyrosine kinase inhibitor (TKI); however, eventually resistance to TKI is developed in these cells, which leads to the failure of treatment. The most common mechanism of this acquired drug resistance is development of a secondary T790M mutation in EGFR. In this study, we investigated the effects of the combination of Erlotinib and Cetuximab on T790M and L858R mutation lung cancer cells lines (H1975), in the primary NSCLC cells with the T790M mutation and TKI-resistant EGFR mutations human tumor xenograft model (H1975). METHODS: The effects of these two agents on cell proliferation, apoptosis, and EGFR-dependent signaling were evaluated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, annexin V staining, and Western blotting. Sensitivity of EGFR inhibitors was detected in the primary tumor cell suspension and human tumor xenograft model (H1975). RESULTS: Compared with single-agent treatment, the combination of Cetuximab and Erlotinib increased apoptosis of EGFR TKI-resistant NSCLC cells (H1975), resulting in more pronounced growth inhibition on cell proliferation and significant inhibition of EGFR-dependent signaling. CONCLUSIONS: These data suggest that treatment with a combination of Erlotinib and Cetuximab overcomes T790M-mediated drug resistance.
Association of Levofloxacin Resistance with Mortality in Adult Patients with Invasive Pneumococcal Diseases: a Post Hoc Analysis of a Prospective Cohort
Infection. Jul, 2012 | Pubmed ID: 22821428
OBJECTIVE: This study was conducted to identify risk factors for mortality and to evaluate the impact of antimicrobial resistance on outcome in adult patients with invasive pneumococcal disease (IPD). METHODS: A post hoc analysis of an observational cohort study on community-acquired pneumococcal infections was conducted and a total of 136 adult patients with IPD were analyzed in this study. RESULTS: Pneumonia was the most common type of infection (n = 84, 61.8 %), followed by primary bacteremia (n = 15, 11.0 %) and meningitis (n = 15, 11.0 %). One hundred and three patients (75.7 %) had concomitant pneumococcal bacteremia. The overall 30-day mortality rate was 26.5 % (36/136), and factors associated with 30-day mortality were corticosteroid use, presentation with septic shock, and development of acute respiratory distress syndrome (ARDS) (all P < 0.05). While penicillin and erythromycin resistance were associated with a lower mortality, an association between levofloxacin resistance and increased mortality was found in the univariate analysis; however, statistical significance was not reached (P = 0.083). Multivariable analysis showed that presentation with septic shock, corticosteroid use, development of ARDS, and levofloxacin resistance were independent factors associated with 30-day mortality. Of the five patients with IPD caused by levofloxacin-resistant Streptococcus pneumoniae, three (60 %) died within 30 days of diagnosis. CONCLUSION: Levofloxacin resistance was associated with increased mortality, along with septic shock, prior use of corticosteroids, and development of ARDS, in adult patients with IPD. Our data suggest that the emergence of levofloxacin resistance among invasive pneumococcal isolates is now becoming a challenge for clinicians managing community-acquired bacterial infections.
SP1 Mediates the Link Between Methylation of the Tumour Suppressor MiR-149 and Outcome in Colorectal Cancer
The Journal of Pathology. Jul, 2012 | Pubmed ID: 22821729
Although recent studies indicate that DNA methylation contributes to the downregulation of micro RNAs (miRNAs) in colorectal cancer (CRC), this field remains largely unexplored. To identify methylation-silenced miRNAs and clarify their role in CRC, we performed a microarray analysis and screened for miRNAs that were induced in CRC cells by 5-aza-2'-deoxycytidine treatment or by the knockdown of DNA methyltransferases. The DNA methylation status of the candidate miRNA was analysed by bisulphite sequencing PCR and methylation-specific PCR. We found that miRNA-149 (miR-149) was epigenetically silenced in CRC and downregulation of miR-149 was associated with hypermethylation of the neighbouring CpG island (CGI). Quantitative RT-PCR analysis demonstrated that miR-149 level was markedly reduced in 51.6% of the CRC tissues compared with matched non-cancerous tissues. In addition, low expression of miR-149 was associated with a greater depth of invasion (P = 0.012), lower 5-year survival rate (P = 0.025), and was found to be an independent prognostic factor for overall survival (P = 0.016) in a multivariate analysis. Moreover, transfection of miR-149 inhibited cell growth and invasion of CRC cells in vitro. We also identified mRNA for Specificity Protein 1 (SP1, Sp1), a potential oncogenic protein, as a target of miR-149. Our data suggest that, as a methylation-sensitive miRNA, miR-149 may play an important role as a tumour suppressor in CRC, which has prognostic and therapeutic implications. Copyright © 2012 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.