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Goutagny, Nadege; Jiang, Zhaozhao; Tian, Jane; Parroche, Peggy; Schlicki, Jeanne; Monks, Brian G.; Ulbrandt, Nancy; Ji, Hong; Kiener, Peter; Coyle, Anthony J.; Fitzgerald, Katherine A.
The Journal of immunology (1950), 12/2009, Letnik: 184, Številka: 3Journal Article
Human Metapneumoviruses (HMPV) are recently identified Paramyxoviridae that contribute to respiratory tract infections in children. No effective treatments or vaccines are available. Successful defense against virus infection relies on early detection by germline encoded pattern recognition receptors and activation of cytokine and type I interferon genes. Recently, the RNA helicase Retinoic acid inducible gene (RIG-I) has been shown to sense HMPV. In this study, we investigated the ability of two prototype strains of HMPV (A1 NL\1\00 and B1 NL\1\99) to activate RIG-I and induce type I interferons (IFN). Despite the ability of both HMPV-A1 and B1 to infect and replicate in cell lines and primary cells, only the HMPV-A1 strain triggered RIG-I to induce IFNA/B gene transcription. The failure of the HMPV-B1 strain to elicit type I IFN production was dependent on the B1 phosphoprotein, which specifically prevented RIG-I-mediated sensing of HMPV viral 5’ triphosphate RNA. In contrast to most cell types, plasmacytoid dendritic cells (PDC) displayed a unique ability to sense both the A1 and B1 strains and in this case sensing was via Toll-like receptor (TLR)-7 rather than RIG-I. Collectively, these data reveal differential mechanisms of sensing for two closely related viruses, which operate in cell-type specific manners.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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