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Hepatitis C virus (HCV) has evolved complex strategies to evade host immune responses and establish chronic infection. The only treatment available for HCV infections, alpha interferon (IFN-alpha), is effective in a limited percentage of patients. The mechanisms by which IFN-alpha interferes with the HCV life cycle and the reasons for limited effectiveness of IFN-alpha therapy have not yet been fully elucidated. Using a cell-based HCV replication system and specific kinase inhibitors, we examined the role played by various signaling pathways in the IFN-alpha-mediated HCV clearance. We reported that conventional protein kinase C (cPKC) activity is important for the effectiveness of IFN-alpha treatment. In cells treated with a cPKC-specific inhibitor, IFN-alpha failed to induce an efficient HCV RNA degradation. The lack of cPKC activity leads to a broad reduction of IFN-alpha-stimulated gene expression due to a significant impairment of STAT1 and STAT3 tyrosine phosphorylation. Thus, modulation of cPKC function by either host or viral factors could influence the positive outcome of IFN-alpha-mediated antiviral therapies.

Conventional Protein Kinase C Inhibition Prevents Alpha Interferon-Mediated Hepatitis C Virus Replicon Clearance by Impairing STAT Activation