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Hepatitis C virus (HCV) infection blocks cellular interferon (IFN)‐mediated antiviral signaling through cleavage of Cardif by HCV‐NS3/4A serine protease. Like NS3/4A, NS4B protein strongly blocks IFN‐β production signaling mediated by retinoic acid–inducible gene I (RIG‐I); however, the underlying molecular mechanisms are not well understood. Recently, the stimulator of interferon genes (STING) was...
HCV-JFH1 yields subclones that develop cytopathic plaques (Sekine-Osajima Y, et al., Virology 2008; 371:71). Here, we investigated viral amino acid substitutions in cytopathic mutant HCV-JFH1 clones and their characteristics in vitro and in vivo. The mutant viruses with individual C2441S, P2938S or R2985P signature substitutions, and with all three substitutions, showed significantly higher intracellular...
Background Hepatitis C virus (HCV) replication is affected by several host factors. Here, we screened host genes and molecular pathways that are involved in HCV replication by comprehensive analyses using two genotypes of HCV replicon-expressing cells, their cured cells and naïve Huh7 cells. Methods Huh7 cell lines that stably expressed HCV genotype 1b or 2a replicon were used. The cured cells were...
HCV culture in vitro results in massive cell death, which suggests the presence of HCV-induced cytopathic effects. Therefore, we investigated its mechanisms and viral nucleotide sequences involved in this effect using HCV-JFH1 cell culture and a newly developed HCV plaque assay technique. The plaque assay developed cytopathic plaques, depending on the titer of the inoculum. In the virus-infected cells,...
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