Hepatitis B virus X protein mutants exhibit distinct biological activities in hepatoma Huh7 cells
- Department of Pathology, Changhai Hospital, Second Military Medical University, 174 Changhai Road, Shanghai 200433 (China)
- Department of Biology, College of Science and Technology, Temple University, Philadelphia, PA 19122 (United States)
- National Engineering Center for Biochip at Shanghai, Shanghai 201203 (China)
The role of the hepatitis B virus X protein (HBx) in hepatocarcinogenesis remains controversial. To investigate the biological impact of hepatitis B virus x gene (HBx) mutation on hepatoma cells, plasmids expressing the full-length HBx or HBx deletion mutants were constructed. The biological activities in these transfectants were analyzed by a series of assays. Results showed that HBx3'-20 and HBx3'-40 amino acid deletion mutants exhibited an increase in cellular proliferation, focus formation, tumorigenicity, and invasive growth and metastasis through promotion of the cell cycle from G0/G1 to the S phase, when compared with the full-length HBx. In contrast, HBx3'-30 amino acid deletion mutant repressed cell proliferation by blocking in G1 phase. The expression of P53, p21{sup WAF1}, p14{sup ARF}, and MDM2 proteins was regulated by expression of HBx mutants. In conclusions, HBx variants showed different effects and functions on cell proliferation and invasion by regulation of the cell cycle progression and its associated proteins expression.
- OSTI ID:
- 21143844
- Journal Information:
- Biochemical and Biophysical Research Communications, Vol. 373, Issue 4; Other Information: DOI: 10.1016/j.bbrc.2008.06.087; PII: S0006-291X(08)01260-6; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0006-291X
- Country of Publication:
- United States
- Language:
- English
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