Abstract
Chronic infection with hepatitis C virus (HCV) may lead to liver failure and hepatocellular carcinoma. Current treatment for HCV includes high systemic doses of interferonα (IFNα), which is effective in less than half of patients and may have severe side effects. We designed conditional IFNα and IFNγ expression constructs to be triggered by HCV-induced activation of NFκB, and delivered these using highly efficient recombinant Tag-deleted SV40-derived vectors. NFκB activates the HIV-1NL4-3 long terminal repeat (HIVLTR) as a promoter, which accounts for the conditional transgene expression. Human hepatocyte lines and primary rat hepatocytes (PRH) were transduced with SV[HIVLTR](IFN) vectors, and transfected with HCV cDNA. Production of human and murine IFNα and IFNγ in cytosol and culture supernatants was measured. HCV activated the HIVLTR to produce and secrete IFNs, and did so largely through the NFκB binding sites of the HIVLTR. Levels of IFNs secreted, and the magnitude of induction in response to HCV, were greater in hepatocyte lines than in primary cultured hepatocytes. However, even in the latter, supernatant IFNα concentrations achieved by this approach were similar to therapeutic serum concentrations sought in systemic IFNα-treated patients. In coculture studies, secreted IFNα activated its cognate response elements in untransduced cells, suggesting that its potential inhibitory effects on HCV may not be limited to transduced cells. Although HCV replication in culture is difficult to assess, HCV-induced IFNα production demonstrably reduced HCV transcription. Conditional expression of IFNs within the liver may represent an attractive approach to therapy of severe chronic HCV infection that could avoid the side effects of systemic treatment regimens.
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Acknowledgements
We greatly appreciate the input of Drs J Roy Chowdhury, Pierre Cordelier, Mark Feitelson, Geetha Jayan, and Aleem Siddiqui. The assistance of Dr Jan Hoek's lab was helpful in establishing primary hepatocyte cultures. Dr Mark Feitelson (TJU) kindly supplied us with pRC/CMV-HCV; Dr Henry Wu (Immune Response Corp) provided us with the cDNA for hIFNα 2b; Dr Janet S Butel (Baylor College of Medicine) gave us the plasmids carrying the original wtSV40 genome, from which rSV40 vectors were made. The current work was supported by NIH Grants AI41399, AI48244, and RR13156.
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Matskevich, A., Strayer, D. Exploiting hepatitis C virus activation of NFκB to deliver HCV-responsive expression of interferons α and γ. Gene Ther 10, 1861–1873 (2003). https://doi.org/10.1038/sj.gt.3302091
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DOI: https://doi.org/10.1038/sj.gt.3302091
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