Hepatitis C virus blocks interferon effector function by inducing protein kinase R phosphorylation.

Hepatitis C virus blocks interferon effector function by inducing protein kinase R phosphorylation.
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DOI:
10.1016/j.chom.2009.11.004
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发表时间:
2009-12-17
影响因子:
30.3
通讯作者:
Chisari FV
Chisari FV
中科院分区:
医学1区
文献类型:
--
作者:
Garaigorta U;Chisari FV

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丙型肝炎病毒(HCV)对1型干扰素(IFN)耐药的机制尚不清楚。最近开发的HCV感染的细胞培养模型允许在完整病毒生命周期的背景下分析宿主-病毒相互作用,包括IFN抗性。在这份报告中,我们发现HCV在感染细胞中扩增时强烈触发PKR和eIF 2 α的磷酸化。此外,HCV感染减弱干扰素刺激基因(ISG)蛋白表达的诱导,尽管ISG mRNA的正常诱导。我们还表明,ISG蛋白的诱导恢复到正常水平,IFN的抗病毒作用增强时,PKR的表达下调干扰素处理的感染细胞中的shRNA。这些结果表明,HCV激活PKR的能力,可能是矛盾的,是有利的病毒在干扰素应答过程中,通过优先抑制ISGs的翻译。
The mechanisms underlying hepatitis C virus (HCV) resistance to type 1 interferon (IFN) are not well understood. The recent development of a cell culture model of HCV infection allows analysis of host-virus interactions, including IFN resistance, in the context of the complete virus life cycle. In this report we show that HCV strongly triggers the phosphorylation of PKR and eIF2α as it expands in infected cells. In addition, HCV infection attenuates the induction of interferon-stimulated gene (ISG) protein expression despite normal induction of ISG mRNAs. We also show that ISG protein induction is restored to normal levels and the antiviral effect of IFN is enhanced when PKR expression is down-regulated by shRNA in IFN-treated infected cells. These results suggest that the ability of HCV to activate PKR may, paradoxically, be advantageous for the virus during an IFN response by preferentially suppressing the translation of ISGs.
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