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Innate Immun. 2013;19(2):193-202. doi: 10.1177/1753425912460414. Epub 2012 Oct 11.

Retinoic acid inducible gene-I (RIG-I) signaling of hepatic stellate cells inhibits hepatitis C virus replication in hepatocytes.

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1
The Center for Animal Experiment and ABSL-3 Laboratory, Wuhan University, Wuhan, People's Republic of China.

Abstract

Retinoic acid inducible gene-I (RIG-I) is critical in the activation of the type I IFN-dependent antiviral innate immune response to hepatitis C virus (HCV) infection. We examined whether hepatic stellate cells (HSC; LX-2) possess a functional RIG-I signaling pathway and produce antiviral factors that can inhibit HCV. We showed that LX-2 cells treated with the RIG-I ligand (5'ppp-dsRNA) expressed significantly higher levels of IFN-β and IFN-λ than the control cells. The RIG-I activation in LX-2 cells also induced the expression of Toll-like receptor 3 (TLR3) and IFN regulatory factor-7 (IRF-7), the key regulators of the IFN signaling pathway. When HCV Japanese fulminant hepatitis (JFH)-1-infected hepatocytes were co-cultured with LX-2 cells stimulated with 5'ppp-dsRNA or incubated in media conditioned with supernatant (SN) from 5'ppp-dsRNA-stimulated LX-2 cells, HCV replication in hepatocytes was suppressed significantly. This LX-2 cell action on HCV replication was mediated through both IFN-β and IFN-λ, as Abs to IFN-α/β or IFN-λ receptors could neutralize the LX-2 SN-mediated anti-HCV effect. The role of IFNs in LX-2 cell-mediated anti-HCV activity is further supported by the observation that LX-2 SN treatment induced the expression of IFN stimulated genes, 2'-5'-oligoadenylate synthase-1 (OAS-1) and myxovirus resistance A (MxA), in HCV-infected Huh7 cells. These observations highlight the importance of HSC in liver innate immunity against HCV infection via a RIG-I-mediated signaling pathway.

PMID:
23060457
PMCID:
PMC3935722
DOI:
10.1177/1753425912460414
[Indexed for MEDLINE]
Free PMC Article

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