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A more recent version of this article appeared on December 1, 2007

Published online before print November 8, 2007
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Copyright © 2007 American Society for Investigative Pathology
American Journal of Pathology, doi:10.2353/ajpath.2007.070413

Accepted for publication August 21, 2007.

Article

Responses of Nontransformed Human Hepatocytes to Conditional Expression of Full-Length Hepatitis C Virus Open Reading Frame

Weiliang Tang*, Catherine A. Lázaro*, Jean S. Campbell*, W. Tony Parks*, Michael G. Katze{dagger}, and Nelson Fausto*@

From the Departments of Pathology,* and Microbiology,{dagger} University of Washington School of Medicine, Seattle, Washington

@ To whom correspondence should be addressed. E-mail: nfausto{at}u.washington.edu.


  Abstract

Hepatitis C virus (HCV) is a major cause of chronic hepatitis that can lead to cirrhosis and hepatocellular carcinoma. To study the effects of HCV protein expression on host cells, we established conditional expression of the full-length open reading frame (ORF) of an infectious cDNA clone of HCV (genotype 1a, H77 strain) in the nontransformed human hepatocyte line cell HH4 using the ecdysone receptor regulatory system. Treatment with the ecdysone analog ponasterone-A induced tightly regulated and dose-dependent full-length HCV ORF expression and properly processed HCV proteins. HCV Core, NS3, and NS5A colocalized in perinuclear regions and associated with the early endosomal protein EEA1. HCV ORF expression caused marked growth inhibition, increased intracellular reactive oxygen species, up-regulation of glutamate-L-cysteine ligase activity, increased glutathione level, and activation of nuclear factor {kappa}B. Although it was not directly cytotoxic, HCV ORF expression sensitized HH4 cells to Fas at certain concentrations but not to tumor necrosis factor-related apoptosis-inducing ligand. HCV ORF expression in HH4 cells up-regulated genes involved in innate immune response/inflammation and oxidative stress responses and down-regulated cell growth-related genes. Expression of HCV ORF in host cells may contribute to HCV pathogenesis by producing oxidative stress and increasing the expression of genes related to the innate immune response and inflammation.




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Copyright © 2007 by the American Society for Investigative Pathology.