Genomic response to interferon-alpha in chimpanzees: implications of rapid downregulation for hepatitis C kinetics

Hepatology : Official Journal of the American Association for the Study of Liver Diseases
Robert E LanfordCatherine B Bigger

Abstract

The mechanism of the interferon-alpha (IFN-alpha)-induced antiviral response during hepatitis C virus (HCV) therapy is n o t completely understood. In this study,we examined the transcriptional response to IFN-alpha in uninfected chimpanzees after single doses of chimpanzee, human, or human-pegylated IFN-alpha. Liver and peripheral blood mononuclear cell (PBMC) samples were used for total genome microarray analysis. Most induced genes achieved maximal response within 4 hours, began to decline by 8 hours, and were at baseline levels by 24 hours postinoculation, a time when high levels of circulating pegylated IFN-alpha were still present. The rapid downregulation of the IFN-alpha response may be involved in the transition between the observed phase I and phase II viral kinetics during IFN-alpha therapy in HCV-infected patients. The response to all three forms of IFN-alpha was similar; thus, the reasons for previous failures in antiviral treatment of chimpanzees with human IFN-alpha were not due to species specificity of IFN-alpha. The response to IFN-alpha was partially tissue-specific. A total of 1778 genes were altered in expression by twofold or more by IFN-alpha, with 538 and 950 being unique to the liver or PBMC, respective...Continue Reading

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