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Metformin activates type I interferon signaling against HCV via activation of adenosine monophosphate-activated protein kinase.


ABSTRACT: Activation of the type I interferon (IFN) signaling pathway is essential for the eradication of hepatitis C virus (HCV). Metformin can activate adenosine monophosphate-activated protein kinase (AMPK) to reduce insulin resistance. Cross talks between AMPK and IFN signaling remain unclear. To understand the influence of metformin on the type I IFN signaling pathway and HCV infection, the full-length HCV replicon OR6 cells and the infectious HCV clones JFH1 were used to assess the anti-HCV effect of the insulin sensitizers, metformin and pioglitazone. Immunofluorescence staining and the immunoblotting of HCV viral protein demonstrated that metformin, but not pioglitazone, inhibited HCV replication in OR-6 and JFH-1-infected Huh 7.5.1 cells. Immunoblotting data showed that metformin activated the phosphorylation of STAT-1 and STAT-2 in OR-6 and JFH-1 infected Huh 7.5.1 cells. Metformin enhanced the phosphorylation of AMPK, and the metformin-activated IFN signaling was down-regulated by AMPK inhibitor. After treatment of AMPK inhibitor, the level of HCV core protein decreased by metformin can be rescued. In conclusion, metformin activates type I interferon signaling and inhibits the replication of HCV via activation of AMPK.

SUBMITTER: Tsai WL 

PROVIDER: S-EPMC5696152 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Metformin activates type I interferon signaling against HCV via activation of adenosine monophosphate-activated protein kinase.

Tsai Wei-Lun WL   Chang Tsung-Hsien TH   Sun Wei-Chi WC   Chan Hoi-Hung HH   Wu Chun-Ching CC   Hsu Ping-I PI   Cheng Jin-Shiung JS   Yu Ming-Lung ML  

Oncotarget 20170814 54


Activation of the type I interferon (IFN) signaling pathway is essential for the eradication of hepatitis C virus (HCV). Metformin can activate adenosine monophosphate-activated protein kinase (AMPK) to reduce insulin resistance. Cross talks between AMPK and IFN signaling remain unclear. To understand the influence of metformin on the type I IFN signaling pathway and HCV infection, the full-length HCV replicon OR6 cells and the infectious HCV clones JFH1 were used to assess the anti-HCV effect o  ...[more]

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