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  • Title: Essential role of IPS-1 in innate immune responses against RNA viruses.
    Author: Kumar H, Kawai T, Kato H, Sato S, Takahashi K, Coban C, Yamamoto M, Uematsu S, Ishii KJ, Takeuchi O, Akira S.
    Journal: J Exp Med; 2006 Jul 10; 203(7):1795-803. PubMed ID: 16785313.
    Abstract:
    IFN-beta promoter stimulator (IPS)-1 was recently identified as an adapter for retinoic acid-inducible gene I (RIG-I) and melanoma differentiation-associated gene 5 (Mda5), which recognize distinct RNA viruses. Here we show the critical role of IPS-1 in antiviral responses in vivo. IPS-1-deficient mice showed severe defects in both RIG-I- and Mda5-mediated induction of type I interferon and inflammatory cytokines and were susceptible to RNA virus infection. RNA virus-induced interferon regulatory factor-3 and nuclear factor kappaB activation was also impaired in IPS-1-deficient cells. IPS-1, however, was not essential for the responses to either DNA virus or double-stranded B-DNA. Thus, IPS-1 is the sole adapter in both RIG-I and Mda5 signaling that mediates effective responses against a variety of RNA viruses.
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