NDLI: Hydrogen peroxide induces La cytoplasmic shuttling and increases hepatitis C virus internal ribosome entry site-dependent translation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Chan, Shiu-Wan
Description	Country affiliation: United kingdom Author Affiliation: Chan SW ( 1âFaculty of Biology, Medicine and Health, The University of Manchester, Manchester, UK.)
Abstract	We have previously shown that physio/pathological levels of hydrogen peroxide (H2O2) stimulate translation from the hepatitis C virus (HCV) internal ribosome entry site (IRES) element in tissue-cultured cells. Here, using in vitro translation, we further show that H2O2 upregulates HCV IRES-dependent mRNA translation and correlates with an increase in intracellular oxidant level. Using Western blotting, immunocytochemistry, microscopy and affinity pulldown, we show that H2O2 stimulates HCV IRES-dependent translation and correlates with nuclear-cytoplasmic shuttling of the La autoantigen, resulting in enhanced binding of cytoplasmic La to HCV IRES RNA. The role of the La protein in H2O2-stimulated IRES-dependent translation is further confirmed by the ability of an anti-La antibody to suppress H2O2-activated IRES-dependent translation in vitro. This is further supported by the ability of an ectopically expressed dominant, negative La mutant protein to suppress H2O2-inducible IRES-mediated translation in Huh7 cells, transiently transfected with a bicistronic reporter and in a sub-genomic replicon cell line resembling a persistent infection. On the other hand, translation from the encephalomyocarditis virus IRES is diminished in the presence of H2O2, suggesting that H2O2 translational responsiveness is a specific property of the HCV IRES and is not a general phenomenon for all viral IRESs. Altogether, these results suggest that HCV adapts to physio/pathological oxidative stress in the host cell by mediating La cytoplasmic shuttling to enhance its IRES-dependent translation.
File Format	HTM / HTML
ISSN	00221317
Issue Number	9
Journal	Journal of General Virology
Volume Number	97
e-ISSN	14652099
Language	English
Publisher	Microbiology Society
Publisher Date	2016-09-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Virology
Content Type	Text
Resource Type	Article
Subject	Virology

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