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Immunity. 2011 Mar 25;34(3):352-63. doi: 10.1016/j.immuni.2011.03.010.

Antiviral protein Viperin promotes Toll-like receptor 7- and Toll-like receptor 9-mediated type I interferon production in plasmacytoid dendritic cells.

Author information

1
Laboratory of Host Defense, WPI Immunology Frontier Research Center, Osaka University, 3-1 Yamada-oka, Suita, Osaka 565-0871, Japan.

Abstract

Toll-like receptor 7 (TLR7) and TLR9 sense viral nucleic acids and induce production of type I interferon (IFN) by plasmacytoid dendritic cells (pDCs) to protect the host from virus infection. We showed that the IFN-inducible antiviral protein Viperin promoted TLR7- and TLR9-mediated production of type I IFN by pDCs. Viperin expression was potently induced after TLR7 or TLR9 stimulation and Viperin localized to the cytoplasmic lipid-enriched compartments, lipid bodies, in pDCs. Viperin interacted with the signal mediators IRAK1 and TRAF6 to recruit them to the lipid bodies and facilitated K63-linked ubiquitination of IRAK1 to induce the nuclear translocation of transcription factor IRF7. Loss of Viperin reduced TLR7- and TLR9-mediated production of type I IFN by pDCs. However, Viperin was dispensable for the production of type I IFN induced by intracellular nucleic acids. Thus, Viperin mediates its antiviral function via the regulation of the TLR7 and TLR9-IRAK1 signaling axis in pDCs.

PMID:
21435586
DOI:
10.1016/j.immuni.2011.03.010
[Indexed for MEDLINE]
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