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Differential effects on apoptosis induction in hepatocyte lines by stable expression of hepatitis B virus X protein

World Journal of Gastroenterology 2006年第29期12卷 4673-4682页

作者： Nicola Fiedler Ellen Quant Ludger Fink Jianguang Sun Ralph Schuster Wolfram H Gerlich Stephan Schaefer Institut for Medizinische Virologie Justus-LiebigUniversitat Frankfurter Str. 107 D-35392 GieBen Germany Abteilung fǖr Innere Medizin Christian AlbrechtUniversitat Kiel Germany Zentrum fǖr Innere Medizin Justus-LiebigUniversitat GieBen Germany Abteilung Virologie Universitat Rostock Schillingallee 70 18055 Rostock Germany Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 China

AIM： Hepatitis B virus protein X （HBx） has been shown to be weakly oncogenic in vitro. The transforming activities of HBx have been linked with the inhibition of several functions of the tumor suppressor p53. We have studied whether HBx may have different effects on p53 depending on the cell type. METHODS： We used the human hepatoma cell line HepG2 and the immortalized murine hepatocyte line AML12 and analyzed stably transfected clones which expressed physiological amounts of HBx. P53 was induced by UV irradiation.RESULTS： The p53 induction by UV irradiation was unaffected by stable expression of HBx. However, the expression of the cyclin kinase inhibitor p21^waf/cip/sdi which gets activated by p53 was affected in the HBx transformed cell line AML12-HBx9, but not in HepG2. In AML-HBx9 cells, p21^waf/ciP/sdi -protein expression and p21^waf/dip/sdi transcription were deregulated. Furthermore, the process of apoptosis was affected in opposite ways in the two cell lines investigated. While stable expression of HBx enhanced apoptosis induced by UV irradiation in HepG2-cells, apoptosis was decreased in HBx transformed AML12-HBx9. P53 repressed transcription from the HBV enhancer I, when expressed from expression vectors or after induction of endogenous p53 by UV irradiation. Repression by endogenous p53 was partially reversible by stably expressed HBx in both cell lines.CONCLUSION： Stable expression of HBx leads to deregulation of apoptosis induced by UV irradiation depending on the cell line used. In an immortalized hepatocyte line HBx acted anti-apoptotic whereas expression in a carcinoma derived hepatocyte line HBx enhanced apoptosis.

关键词： Apoptosis Hepatitis B virus hepatocyte lines

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