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자료유형
학술저널
저자정보
Zhengyuan Xie (Nanchang University) Zhihua Xiao (Nanchang University) Fenfen Wang (Nanchang University)
저널정보
한국분자세포생물학회 Molecules and Cells Molecules and Cells 제40권 제3호
발행연도
2017.3
수록면
202 - 210 (9page)

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The nonstructural protein 5A (NS5A) encoded by the human hepatitis C virus (HCV) RNA genome is a multifunctional phosphoprotein. To analyse the influence of NS5A on apoptosis, we established an Hep-NS5A cell line (HepG2 cells that stably express NS5A) and induced apoptosis using tumour necrosis factor (TNF)-?. We utilised the MTT assay to detect cell viability, real-time quantitative polymerase chain reaction and Western blot to analyse gene and protein expres-sion, and a luciferase reporter gene experiment to investigate the targeted regulatory relationship. Chromatin immunoprecipitation was used to identify the combination of NF-?B and miR-503. We found that overexpression of NS5A inhibited TNF-?-induced hepatocellular apoptosis via regulating miR-503 expression. The cell viability of the TNF-? induced Hep-mock cells was significantly less than the viability of the TNF-? induced Hep-NS5A cells, which demonstrates that NS5A inhibited TNF-?-induced HepG2 cell apoptosis. Under TNF-? treatment, miR-503 expression was decreased and cell viability and B-cell lymphoma 2 (bcl-2) expression were increased in the Hep-NS5A cells. Moreover, the luciferase reporter gene experiment verified that bcl-2 was a direct target of miR-503, NS5A inhibited TNF-?-induced NF-?B activation and NF-?B regulated miR-503 transcription by combining with the miR-503 promoter. After the Hep-NS5A cells were transfected with miR-503 mimics, the data indicated that the mimics could reverse TNF-?-induced cell apoptosis and blc-2 expression. Collectively, our findings suggest a possible molecular mechanism that may contribute to HCV treatment in which NS5A inhibits NF-?B activation to decrease miR-503 expression and increase bcl-2 expression, which leads to a decrease in hepatocellular apoptosis.

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