Article first published online: 30 JAN 2012
Copyright © 2011 American Association for the Study of Liver Diseases
Volume 55, Issue 3, pages 666–675, March 2012
How to Cite
Li, K., Li, N. L., Wei, D., Pfeffer, S. R., Fan, M. and Pfeffer, L. M. (2012), Activation of chemokine and inflammatory cytokine response in hepatitis C virus–infected hepatocytes depends on toll-like receptor 3 sensing of hepatitis C virus double-stranded RNA intermediates. Hepatology, 55: 666–675. doi: 10.1002/hep.24763
Potential conflict of interest: Nothing to report.
This work was supported by National Institutes of Health grants AI069285 (to K.L.) and CA133322 (to L.M.P.).
- Issue published online: 23 FEB 2012
- Article first published online: 30 JAN 2012
- Accepted manuscript online: 26 OCT 2011 09:23AM EST
- Manuscript Accepted: 4 OCT 2011
- Manuscript Received: 24 MAY 2011
Vol. 56, Issue 1, 397, Article first published online: 3 JUL 2012
Chemokines and inflammatory cytokines are key regulators of immunity and inflammation during viral infections. Hepatitis C virus (HCV) is a hepatotropic RNA virus frequently associated with chronic liver inflammation and hepatocellular carcinoma. Intrahepatic levels of chemokines and cytokines are elevated in chronic HCV infections, but the underlying mechanisms remain unclear. We found that Toll-like receptor-3 (TLR3) senses HCV infection in cultured hepatoma cells, leading to nuclear factor kappa B (NF-κB) activation and the production of numerous chemokines and inflammatory cytokines, such as regulated on activation normal T cell expressed and secreted (RANTES), macrophage inflammatory protein (MIP)-1α, MIP-1β, IP-10, and interleukin-6. The chemokine/cytokine induction occurred late in HCV infection and was abrogated when HCV was ultraviolet-inactivated before infection, indicating a dependence on the cellular recognition of HCV replication products. Gel-shift and chromatin immunoprecipitation assays revealed that NF-κB plays a pivotal role in HCV-induced chemokine/cytokine transcription. Mutations specifically disrupting the double-stranded RNA (dsRNA)-binding activity of TLR3 ablated the chemokine/cytokine response to HCV infection, indicating that HCV dsRNA was the pathogen-associated molecular pattern triggering TLR3 signaling. In vitro synthesized HCV dsRNAs, with a minimal length of ∼80-100 base pairs, activated TLR3-dependent chemokine expression, regardless of the genome position from which they derived. In contrast, HCV single-stranded RNAs, including those derived from the structured 3'nontranslated region highly potent for RIG-I activation, failed to do so. Moreover, robust production of chemokines and inflammatory cytokines was also observed in primary human hepatocytes after stimulation with extracellular poly-I:C, a TLR3 ligand. Conclusion: Our data suggest that TLR3-mediated chemokine and inflammatory cytokine responses may play an important role in host immune responses to HCV and the pathogenesis of HCV-associated liver diseases. (HEPATOLOGY 2011)