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- W2031170097 abstract "The hepatitis C virus (HCV) core protein is a component of nucleocapsids and a pathogenic factor for hepatitis C. Several epidemiological and experimental studies have suggested that HCV infection is associated with insulin resistance, leading to type 2 diabetes. We have previously reported that HCV core gene-transgenic (PA28gamma(+/+)CoreTg) mice develop marked insulin resistance and that the HCV core protein is degraded in the nucleus through a PA28gamma-dependent pathway. In this study, we examined whether PA28gamma is required for HCV core-induced insulin resistance in vivo. HCV core gene-transgenic mice lacking the PA28gamma gene (PA28gamma(-/-)CoreTg) were prepared by mating of PA28gamma(+/+)CoreTg with PA28gamma-knockout mice. Although there was no significant difference in the glucose tolerance test results among the mice, the insulin sensitivity in PA28gamma(-/-)CoreTg mice was recovered to a normal level in the insulin tolerance test. Tyrosine phosphorylation of insulin receptor substrate 1 (IRS1), production of IRS2, and phosphorylation of Akt were suppressed in the livers of PA28gamma(+/+)CoreTg mice in response to insulin stimulation, whereas they were restored in the livers of PA28gamma(-/-)CoreTg mice. Furthermore, activation of the tumor necrosis factor alpha promoter in human liver cell lines or mice by the HCV core protein was suppressed by the knockdown or knockout of the PA28gamma gene. These results suggest that the HCV core protein suppresses insulin signaling through a PA28gamma-dependent pathway." @default.
- W2031170097 created "2016-06-24" @default.
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- W2031170097 date "2007-02-15" @default.
- W2031170097 modified "2023-10-03" @default.
- W2031170097 title "Involvement of the PA28γ-Dependent Pathway in Insulin Resistance Induced by Hepatitis C Virus Core Protein" @default.
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- W2031170097 doi "https://doi.org/10.1128/jvi.01683-06" @default.
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