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Search Results: 1 - 10 of 14247 matches for " Zhifang Jia "
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Test of IL28B Polymorphisms in Chronic Hepatitis C Patients Treated with PegIFN and Ribavirin Depends on HCV Genotypes: Results from a Meta-Analysis
Zhifang Jia, Yanhua Ding, Suyan Tian, Junqi Niu, Jing Jiang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0045698
Abstract: Background Many studies have been published on the association between single nucleotide polymorphisms (SNP) near the IL28B gene and response to the combined treatments of pegylated-interferon (PegIFN) and ribavirin (RBV) in chronic HCV-infected patients, but without identical conclusions. The aim of this study was to assess impact of the IL28B polymorphisms on the effect of HCV standard treatment using meta-analysis based method. Methods Association studies between polymorphisms of rs12979860 or rs8099917 and response to PegIFN/RBV treatment in chronic HCV patients were retrieved from PubMed. Data of qualified studies on sustained virological response (SVR) in different genotypes were extracted and analyzed using meta-analysis method in Stata 10 software. Results Thirty-four papers, containing 46 independent studies, were included in the analysis. In the HCV G1/4 patients without treatment history, individuals carrying rs12979860 CC genotype were more likely to achieve SVR (OR 3.97, 95%CI 3.29–4.80) compared to those carrying CT/TT genotypes. Similar results were observed in the HCV G1/4 patients with unsuccessful or unknown treatment history (OR 3.76, 95%CI 2.67–5.28) or in the patients co-infected with human immunodeficiency virus (OR 5.20, 95%CI 3.04–8.90). However, associations could not be observed in HCV G2/3 patients. For rs8099917, similar results were obtained for genotype TT compared to genotypes TG/GG, indicating that TT genotype was significantly associated with better treatment response in patients infected with genotype 1 or 4 HCV, but not genotype 2 or 3 HCV. Conclusion Polymorphisms of rs12979860 and rs8099917 near IL28B only associate with the treatment response to PegIFN/RBV in patients infected with HCV genotype 1 or 4 but not with genotype 2 or 3, irrespective of the previous treatment history or HIV co-infected status. Therefore, identification of IL28B genotypes is necessary only in patients infected with relatively difficult-to-treat genotype 1 or 4 HCV.
The Association between Polymorphisms of XPD and Susceptibility of Lung Cancer: A meta Analysis
Zhifang JIA,Zhihua YIN,Peng GUAN,Baosen ZHOU
Chinese Journal of Lung Cancer , 2009,
Abstract: Background and objective Many studies concluded that the polymorphisms of XPD were involved in the risk of lung cancer. However, several other studies suggested no association. To explore whether the polymorphisms of XPD contribute to the genetic susceptibility to lung cancer, we carried a meta-analysis based on the published works. Methods All works related to XPD and lung cancer risk were searched and carefully selected. The genotype frequencies of XPD and related variables were abstracted and the pooled ORs were calculated after the heterogeneity test with the software Stata 10. Publication bias and sensitivity were evaluated at the same time. Results Twenty-two studies were included according to the selection criteria, of which fifteen investigated the codon 312 of XPD and twenty studied the codon 751. The pooled OR of susceptibility to lung cancer with XPD312 Asn/Asn genotype compared to the wild Asp/Asp were 1.18 (95%CI: 1.03-1.34, P=0.018). And the polymorphisms of XPD codon 751 were also associated with increased lung cancer risk (Lys/Gln OR=1.09, 95%CI: 1.02-1.18; Gln/Gln OR=1.24, 95%CI: 1.10-1.41). However, subgroup analysis indicated that the association between XPD751 and lung cancer could only be found in Europeans and Americans. The publication bias analysis had no statistically significant results. Conclusion Polymorphisms of XPD codons 312 and 751 seem to be involved in elevated risk of lung cancer.
Polymorphisms of the DNA Methyltransferase 1 Associated with Reduced Risks of Helicobacter pylori Infection and Increased Risks of Gastric Atrophy
Jing Jiang, Zhifang Jia, Donghui Cao, Mei-Shan Jin, Fei Kong, Jian Suo, Xueyuan Cao
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0046058
Abstract: Introduction DNA methyltransferase-1(DNMT1) is an important enzyme in determining genomic methylation patterns in mammalian cells. We investigated the associations between SNPs in the DNMT1 gene and risks of developing H. pylori seropositivity, gastric atrophy and gastric cancer in the Chinese population. Methods The study consisted of 447 patients with gastric cancer; 111 patients with gastric atrophy; and 961 healthy controls. Five SNPs, rs10420321, rs16999593, rs8101866, rs8111085 and rs2288349 of the DNMT1 gene were genotyped. Anti-H.pylori IgG was detected by ELISA. Gastric atrophy was screened by the level of serum pepsinogen Ιand II and then confirmed by endoscopy and histopatholgical examinations. Results The age- and sex-adjusted OR of H. pylori seropositivity was 0.67 (95%CI: 0.51–0.87) for rs8111085 TC/CC genotypes, significantly lower than the TT genotype in healthy controls. The adjusted OR of H.pylori seropositivity was 0.68 (95%CI: 0.52–0.89) for rs10420321 AG/GG genotypes. In addition, patients carrying rs2228349 AA genotype have a significantly increased risk for H.pylori seropositivity (OR = 1.67; 95%CI: 1.02–2.75). Further haplotype analyses also showed that the ATTTG and ATCTA are significantly associated with increased risks in H.pylori infection compared to the GTCCG haplotype (OR = 1.38, 95%CI: 1.08–1.77; OR = 1.40, 95% CI: 1.09–1.80). The adjusted ORs of gastric atrophy were 1.66 (95%CI: 1.06–2.61) for rs10420321 GG genotype, and 1.67 (95%CI 1.06–2.63, P = 0.03) for rs8111085 CC genotype, but no association was found between SNPs in the DNMT1 gene and risk of developing gastric cancer. Conclusions Individuals with rs10420321 GG and rs8111085 CC genotype of the DNMT1 gene were associated with reduced risks for H.pylori infection. On the other hand, higher risks of gastric atrophy were found in the carriers with these two genotypes compared to other genotypes. Our results suggested that SNPs of DNMT1 could be used as genotypic markers for predicting genetic susceptibilities to H.pylori infection and risks in gastric atrophy.
Resveratrol Inhibits the Growth of Gastric Cancer by Inducing G1 Phase Arrest and Senescence in a Sirt1-Dependent Manner
Qing Yang, Bo Wang, Wen Zang, Xuping Wang, Zhifang Liu, Wenjuan Li, Jihui Jia
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0070627
Abstract: Resveratrol, a naturally occurring polyphenolic compound, has been reported to exert anticancer activity by affecting diverse molecular targets. In this study, we examined the effects and the underlying mechanisms of resveratrol on gastric cancer. We found that resveratrol inhibited the proliferation of gastric cancer cells in a dose-dependent manner. At the concentration of 25 and 50 μM, resveratrol inhibited the cell viability and diminished the clonogenic potential of gastric cancer cells. Resveratrol treatment arrested gastric cancer cells in the G1 phase and led to senescence instead of apoptosis. Regulators of the cell cycle and senescence pathways, including cyclin D1, cyclin-dependent kinase (CDK4 and 6), p21 and p16, were dysregulated by resveratrol treatment. The inhibitory effects of resveratrol on gastric cancer were also verified in vivo using a nude mice xenograft model. Resveratrol (40 mg/kg/d) exerted inhibitory activities on gastric cancer development and significantly decreased the fractions of Ki67-positive cells in the tumor specimens from the nude mice. After resveratrol treatment, the induction of senescence and the changes in the expression of the regulators involved in the cell cycle and senescence pathways were similar to what we observed in vitro. However, the depletion of Sirtuin (Sirt)1 reversed the above-described effects of resveratrol both in vitro and in vivo. Our data suggest that resveratrol inhibits gastric cancer in a Sirt1-dependent manner and provide detailed evidence for the possibility of applying resveratrol in gastric cancer prevention and therapy.
Network Coding Based on Chinese Remainder Theorem
Zhifang Zhang
Mathematics , 2012,
Abstract: Random linear network code has to sacrifice part of bandwidth to transfer the coding vectors, thus a head of size k log|T| is appended to each packet. We present a distributed random network coding approach based on the Chinese remainder theorem for general multicast networks. It uses a couple of modulus as the head, thus reduces the size of head to O(log k). This makes it more suitable for scenarios where the number of source nodes is large and the bandwidth is limited. We estimate the multicast rate and show it is satisfactory in performance for randomly designed networks.
DKBLM — Deep knowledge based learning methodology
DKBLM——Deep Knowledge Based Learning Methodology

Zhifang Ma,
Ma
,Zhifang

计算机科学技术学报 , 1993,
Abstract: To solve the Imperfect Theory Problem(ITP)faced by Explanation Based Generalization(EBG), this paper proposes a methodology,Deep Knowledge Based Learning Methodology(DKBLM)by name, and gives an implementstion of DKBLM,called Hierarchically Distributed Learning System(HDLS).As an example of HDLS's application,this paper shows a learning system(MLS)in meteorology domain and its running with a simplified example. DKBLM can acquire experiential knowledge with causality in it.it is applicable to those kinds of domains,in which experiments are relatively difficult to carry out,and in which there exist many available knowledge systems at different levels for the same domain(such as weather forecasting).
Intralesional pingyangmycin injection sclerotherapy for oral ranulas  [PDF]
Zhifang Chen, Jiawei Zheng, Shanyong Zhang
Open Journal of Stomatology (OJST) , 2013, DOI: 10.4236/ojst.2013.37061
Abstract:

Objective: To investigate the efficiency of pingyangmycin (PYM) intralesional injection for the treatment of ranulas in clinical practice. Methods: PYM concentrations were 2.0 mg/ml (8 mg PYM powder + 1 ml normal saline + 2 ml 2% lidocaine + 1 ml dexamethasone). The mixed PYM solution was intralesional injected into ranulas after drawing out isometric cyst fluid in 3 patients. Results: The ranulas of 3 patients showed total disappearance after the sclerotherapy, and no recurrence was found after 6 months to 3 years’ follow-up. Compared to surgical therapy, the PYM sclerotherapy was advocated by clinicians for its advantages of less injury, no scar, less suffering, etc. Conclusions: PYM is an effective sclerosing agent for ranulas. Intracystic injection of PYM may be an optimal method for the treatment of ranulas.

Review on the Effect of Resveratrol on Central Nervous System Disease  [PDF]
Wenzhe Dong, Yan Zhou, Zhifang Yang
Journal of Behavioral and Brain Science (JBBS) , 2016, DOI: 10.4236/jbbs.2016.63014
Abstract: Resveratrol (3,5,4’-trihydroxy-trans-stilbene, RV) is a kind of phytoalexin found in many kinds of plants and food. As a natural antioxidant, RV shows significant biological activity, including anti-tumor activity, antitubulin activity, cardiovascular disease resistance activity, etc. Many experiments confirm that resveratrol displays a wide range of beneficial effects on human diseases including heart disease and cancer, especially in the treatment of central nervous system disease, such as Huntington’s disease (HD), Alzheimer’s disease (AD) and Parkinson’s disease (PD). This paper summarizes the positive effects of RV on several central nervous system diseases.
Research Progress of Mechanism of Action of Resveratrol  [PDF]
Wenzhe Dong, Yan Zhou, Zhifang Yang
Pharmacology & Pharmacy (PP) , 2016, DOI: 10.4236/pp.2016.74022
Abstract: Resveratrol is a kind of polyphenolic compound that widely exists in plants and has extensive physiological pharmacological function and is very useful for human health. For the mechanism of action and function of RV, people are doing a variety of groundbreaking researches. Results show that the molecular mechanism of RV is embodied in aspects such as oxidative stress and diseases of neuropathy, anti-oxygenation and pro-oxidant effect and RV target molecule, etc. This article mainly summarized the mechanism of action of resveratrol in these aspects.
Histone Demethylase Retinoblastoma Binding Protein 2 is Overexpressed in Hepatocellular Carcinoma and Negatively Regulated by hsa-miR-212
Xiuming Liang, Jiping Zeng, Lixiang Wang, Ming Fang, Qing Wang, Min Zhao, Xia Xu, Zhifang Liu, Wenjuan Li, Shili Liu, Han Yu, Jihui Jia, Chunyan Chen
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069784
Abstract: Background The H3K4 demethylase retinoblastoma binding protein 2 (RBP2) is involved in the pathogenesis of gastric cancer, but its role and regulation in hepatocellular carcinoma (HCC) is unknown. We determined the function of RBP2 and its regulation in HCC in vitro and in human tissues. Methods We analyzed gene expression in 20 specimens each of human HCC and normal liver tissue by quantitative real-time PCR and immunohistochemistry. Proliferation was analyzed by foci formation and senescence by β-galactosidase staining. Promoter activity was detected by luciferase reporter assay. Results The expression of RBP2 was stronger in cancerous than non-cancerous tissues, but that of its binding microRNA, Homo sapiens miR-212 (hsa-miR-212), showed an opposite pattern. SiRNA knockdown of RBP2 significantly upregulated cyclin-dependent kinase inhibitors (CDKIs), with suppression of HCC cell proliferation and induction of senescence. Overexpression of hsa-miR-212 suppressed RBP2 expression, with inhibited cell proliferation and induced cellular senescence, which coincided with upregulated CDKIs; with low hsa-miR-212 expression, CDKIs were downregulated in HCC tissue. Inhibition of hsa-miR-212 expression upregulated RBP2 expression. Luciferase reporter assay detected the direct binding of hsa-miR-212 to the RBP2 3′ UTR. Conclusions RBP2 is overexpressed in HCC and negatively regulated by hsa-miR-212. The hsa-miR-212–RBP2–CDKI pathway may be important in the pathogenesis of HCC.
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