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• W2057973013 endingPage "e1004779" @default.
• W2057973013 startingPage "e1004779" @default.
• W2057973013 abstract "Innate immunity is the first line of defense against microbial insult. The transcription factor, IRF3, is needed by mammalian cells to mount innate immune responses against many microbes, especially viruses. IRF3 remains inactive in the cytoplasm of uninfected cells; upon virus infection, it gets phosphorylated and then translocates to the nucleus, where it binds to the promoters of antiviral genes and induces their expression. Such genes include type I interferons (IFNs) as well as Interferon Stimulated Genes (ISGs). IRF3-/- cells support enhanced replication of many viruses and therefore, the corresponding mice are highly susceptible to viral pathogenesis. Here, we provide evidence for an unexpected pro-microbial role of IRF3: the replication of the protozoan parasite, Toxoplasma gondii, was significantly impaired in IRF3-/- cells. In exploring whether the transcriptional activity of IRF3 was important for its pro-parasitic function, we found that ISGs induced by parasite-activated IRF3 were indeed essential, whereas type I interferons were not important. To delineate the signaling pathway that activates IRF3 in response to parasite infection, we used genetically modified human and mouse cells. The pro-parasitic signaling pathway, which we termed PISA (Parasite-IRF3 Signaling Activation), activated IRF3 without any involvement of the Toll-like receptor or RIG-I-like receptor pathways, thereby ruling out a role of parasite-derived RNA species in activating PISA. Instead, PISA needed the presence of cGAS, STING, TBK1 and IRF3, indicating the necessity of DNA-triggered signaling. To evaluate the physiological significance of our in vitro findings, IRF3-/- mice were challenged with parasite infection and their morbidity and mortality were measured. Unlike WT mice, the IRF3-/- mice did not support replication of the parasite and were resistant to pathogenesis caused by it. Our results revealed a new paradigm in which the antiviral host factor, IRF3, plays a cell-intrinsic pro-parasitic role." @default.
• W2057973013 created "2016-06-24" @default.
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• W2057973013 date "2015-03-26" @default.
• W2057973013 modified "2023-10-16" @default.
• W2057973013 title "Induction of Interferon-Stimulated Genes by IRF3 Promotes Replication of Toxoplasma gondii" @default.
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• W2057973013 doi "https://doi.org/10.1371/journal.ppat.1004779" @default.
• W2057973013 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4374777" @default.
• W2057973013 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25811886" @default.
• W2057973013 hasPublicationYear "2015" @default.
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