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Proc Natl Acad Sci U S A. 2009 Sep 15;106(37):15903-8. doi: 10.1073/pnas.0906798106. Epub 2009 Aug 26.

Suppression of a pro-apoptotic K+ channel as a mechanism for hepatitis C virus persistence.

Author information

1
Institute of Molecular and Cellular Biology, Faculty of Biological Sciences and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, United Kingdom.

Abstract

An estimated 3% of the global population are infected with hepatitis C virus (HCV), and the majority of these individuals will develop chronic liver disease. As with other chronic viruses, establishment of persistent infection requires that HCV-infected cells must be refractory to a range of pro-apoptotic stimuli. In response to oxidative stress, amplification of an outward K(+) current mediated by the Kv2.1 channel, precedes the onset of apoptosis. We show here that in human hepatoma cells either infected with HCV or harboring an HCV subgenomic replicon, oxidative stress failed to initiate apoptosis via Kv2.1. The HCV NS5A protein mediated this effect by inhibiting oxidative stress-induced p38 MAPK phosphorylation of Kv2.1. The inhibition of a host cell K(+) channel by a viral protein is a hitherto undescribed viral anti-apoptotic mechanism and represents a potential target for antiviral therapy.

PMID:
19717445
PMCID:
PMC2747216
DOI:
10.1073/pnas.0906798106
[Indexed for MEDLINE]
Free PMC Article

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