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Herpes Simplex Virus 1 Has Multiple Mechanisms for Blocking Virus-Induced Interferon Production

By Gregory T. Melroe, Neal A. DeLuca and David M. Knipe

Abstract

In response to viral infection, host cells elicit a number of responses, including the expression of alpha/beta interferon (IFN-α/β). In these cells, IFN regulatory factor-3 (IRF-3) undergoes a sequence of posttranslational modifications that allow it to act as a potent transcriptional coactivator of specific IFN genes, including IFN-β. We investigated the mechanisms by which herpes simplex virus 1 (HSV-1) inhibits the production of IFN-β mediated by the IRF-3 signaling pathway. Here, we show that HSV-1 infection can block the accumulation of IFN-β triggered by Sendai virus (SeV) infection. Our results indicate that HSV-1 infection blocks the nuclear accumulation of activated IRF-3 but does not block the initial virus-induced phosphorylation of IRF-3. The former effect was at least partly mediated by increased turnover of IRF-3 in HSV-1-infected cells. Using mutant viruses, we determined that the immediate-early protein ICP0 was necessary for the inhibition of IRF-3 nuclear accumulation. Expression of ICP0 also had the ability to reduce IFN-β production induced by SeV infection. ICP0 has been shown previously to play a role in HSV-1 sensitivity to IFN and in the inhibition of antiviral gene production. However, we observed that an ICP0 mutant virus still retained the ability to inhibit the production of IFN-β. These results argue that HSV-1 has multiple mechanisms to inhibit the production of IFN-β, providing additional ways in which HSV-1 can block the IFN-mediated host response

Topics: Virus-Cell Interactions
Publisher: American Society for Microbiology
Year: 2004
DOI identifier: 10.1128/JVI.78.16.8411-8420.2004
OAI identifier: oai:pubmedcentral.nih.gov:479070
Provided by: PubMed Central
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