Journal
FEBS LETTERS
Volume 518, Issue 1-3, Pages 169-172Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0014-5793(02)02694-7
Keywords
core; hepatitis B virus; hepatitis B virus X protein; hepatocellular carcinoma; hepatitis C virus; p21
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Co-infection with hepatitis B virus (HBV) and hepatitis C virus (HCV) is common and is associated with a more severe liver disease and increased frequency in the development of hepatocellular carcinoma (HCC). Here, we demonstrated that HBV X protein (HBx) and HCV core protein additively repress the universal cyclin-dependent kinase inhibitor p21 gene at the transcription level. The transforming growth factor-P responsive element and Sp1 site of the p21 promoter were responsible for the effect of HCV core and HBx, respectively. Furthermore, cell growth was additively stimulated by them, suggesting that additive repression of the p21 might be important to understand the cooperative development of HCC by HBV and HCV. (C) 2002 Published by Elsevier Science B.V. on behalf of the Federation of European Biochemical Societies.
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