Abstract
We previously demonstrated that hepatitis C virus (HCV) serine protease NS3-4A was unable to cleave TRIF (adaptor protein of Toll-like receptor 3), resulting in a lack of suppression of the TRIF-mediated pathway, whereas NS3-4A cleaved Cardif (adaptor protein of retinoic acid-inducible gene I or melanoma differentiation-associated gene-5), resulting in an interruption of the Cardif-mediated pathway in non-neoplastic human hepatocyte PH5CH8 cells. To elucidate these observations, we examined the cleavage potential of NS3-4A for TRIF in PH5CH8 cells, genome-length HCV RNA-replicating O cells, and HCV-infected cells, and we demonstrated that NS3-4A lacked the ability to cleave endogenous TRIF, regardless of HCV strains derived from patients with different stages of hepatic disease. Furthermore, we demonstrated that inflammatory cytokine production by NF-κB activation via the TRIF-mediated pathway also remained unsuppressed by NS3-4A. These results suggest that the inhibitory effects of NS3-4A on antiviral signaling pathways are limited to the Cardif-mediated pathway in human hepatocytes.
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Acknowledgments
We would like to thank T. Maeta, K. Takemoto, and T. Nakamura for their technical assistance. K. Naka and S. Ohkoshi are also thanked for their valuable input in this study. This work was supported by Grants-in-Aid for the Third-Term Comprehensive Ten-Year Strategy for Cancer Control, and by a Grant-in-Aid for Research on Hepatitis, both from the Ministry of Health, Labor, and Welfare of Japan.
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Supplementary Fig. S1.
All NS3-4As derived from patients with different hepatic disease diagnoses prevent the activity of T-pIC-induced IFN-β gene promoter via a Cardif-mediated pathway. a Effects of 15 NS3-4As on the activity of IFN-β gene promoter. PH5CH8 cells transiently expressing NS3-4As from various HCV strains were subjected to T-pIC treatment. PH5CH8 cells transfected with pCX4bsr vector were used as a control (strain, -). Dual luciferase assay was performed described in Materials and Methods. Data are expressed as the means ± SD from three independent experiments, each of which was performed in triplicate. b All of the NS3-4As cleaved endogenous Cardif. PH5CH8 cells were transfected with the HA-Cardif-Flag and NS3-4A expression vectors. Production of HA-Cardif-Flag and NS3 was analyzed by immunoblotting using anti-Flag and anti-NS3 antibody, respectively. PH5CH8 cells transfected with the pCX4bsr and pCX4pur vectors were used as a control (-). β-actin was used as a control for the amount of protein loaded per lane. (TIFF 207 kb)
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Dansako, H., Ikeda, M., Ariumi, Y. et al. Double-stranded RNA-induced interferon-beta and inflammatory cytokine production modulated by hepatitis C virus serine proteases derived from patients with hepatic diseases. Arch Virol 154, 801–810 (2009). https://doi.org/10.1007/s00705-009-0375-z
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DOI: https://doi.org/10.1007/s00705-009-0375-z