Hepatitis B virus X protein reduces starvation-induced cell death through activation of autophagy and inhibition of mitochondrial apoptotic pathway

2011 ◽  
Vol 415 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Yi Mao ◽  
Liang Da ◽  
Hong Tang ◽  
Jiali Yang ◽  
Yinrui Lei ◽  
...  
Keyword(s):  
Cell Death ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
X Protein ◽  
Apoptotic Pathway ◽  
Mitochondrial Apoptotic Pathway ◽  
B Virus

Blocking of G1/S transition and cell death in the regenerating liver of Hepatitis B virus X protein transgenic mice

2006 ◽  
Vol 340 (3) ◽  
pp. 916-928 ◽  
Author(s):  
Bo-Kuan Wu ◽  
Chao-Chin Li ◽  
Huei-Jane Chen ◽  
Junn-Liang Chang ◽  
King-Song Jeng ◽  
...  
Keyword(s):  
Cell Death ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Transgenic Mice ◽  
Regenerating Liver ◽  
X Protein ◽  
B Virus

scholarly journals Association of hepatitis B virus X protein with mitochondria causes mitochondrial aggregation at the nuclear periphery, leading to cell death

Oncogene ◽  
1999 ◽  
Vol 18 (50) ◽  
pp. 6965-6973 ◽  
Author(s):  
Shinako Takada ◽  
Yumiko Shirakata ◽  
Noriko Kaneniwa ◽  
Katsuro Koike
Keyword(s):  
Cell Death ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Nuclear Periphery ◽  
X Protein ◽  
B Virus

scholarly journals Hepatitis B Virus X Protein Stimulates Viral Genome Replication via a DDB1-Dependent Pathway Distinct from That Leading to Cell Death

2005 ◽  
Vol 79 (7) ◽  
pp. 4238-4245 ◽  
Author(s):  
Olivier Leupin ◽  
Séverine Bontron ◽  
Céline Schaeffer ◽  
Michel Strubin
Keyword(s):  
Cell Death ◽  
Hepatitis B Virus ◽  
Hepatitis B ◽  
Cell Viability ◽  
Viral Genome ◽  
Genome Replication ◽  
Mrna Levels ◽  
X Protein ◽  
Hbv Replication ◽  
B Virus

ABSTRACT The hepatitis B virus (HBV) X protein (HBx) is essential for virus infection and has been implicated in the development of liver cancer associated with chronic infection. HBx can interact with a number of cellular proteins, and in cell culture, it exhibits pleiotropic activities, among which is its ability to interfere with cell viability and stimulate HBV replication. Previous work has demonstrated that HBx affects cell viability by a mechanism that requires its binding to DDB1, a highly conserved protein implicated in DNA repair and cell cycle regulation. We now show that an interaction with DDB1 is also needed for HBx to stimulate HBV genome replication. Thus, HBx point mutants defective for DDB1 binding fail to complement the low level of replication of an HBx-deficient HBV genome when provided in trans, and one such mutant regains activity when directly fused to DDB1. Furthermore, DDB1 depletion by RNA interference specifically compromises replication of wild-type HBV, indicating that HBx produced from the viral genome also functions in a DDB1-dependent fashion. We also show that HBx in association with DDB1 acts in the nucleus and stimulates HBV replication mainly by enhancing viral mRNA levels, regardless of whether the protein is expressed from the HBV genome itself or supplied in trans. Interestingly, whereas HBx induces cell death in both HepG2 and Huh-7 hepatoma cell lines, it enhances HBV replication only in HepG2 cells, suggesting that the two activities involve distinct DDB1-dependent pathways.

Sign in / Sign up

Export Citation Format

Share Document