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- W2000571142 abstract "Myeloid differentiation factor 88 (MyD88)-dependent IL-12 secretion by dendritic cells is critical for natural killer cell-mediated IFN-γ production and innate resistance to Toxoplasma gondii. Although MyD88−/− mice challenged with T. gondii have defective IL-12 responses and succumb to infection, administration of IL-12 to MyD88−/− mice fails to prevent acute mortality, suggesting that MyD88 may mediate signals within natural killer cells important for IL-12-dependent IFN-γ production and innate resistance to this parasite. In this study, we found that T. gondii antigens and IL-12 could synergistically trigger IFN-γ secretion by natural killer cells, which was dependent on toll-like receptor-MyD88 signaling. Further analysis showed that p38 mitogen-activated protein kinase, extracellular signal-regulated kinase, c-Jun N-terminal kinase and NF-κB multiple pathways downstream of MyD88 contributed to IFN-γ production by natural killer cells. Moreover, the well-established toll-like receptor agonists, T. gondii profilin (Tgprofilin) and T. gondii heat shock protein 70 (TgHSP70) could evoke a similar IFN-γ secretory response in natural killer cells to that evoked by T. gondii antigens. In vivo adoptive transfer experiments showed that, upon challenge with T. gondii, NOD/SCID-β2 microglobulin null (NOD/SCID-β2m−/−) mice injected i.v. with MyD88−/− natural killer cells had reduced serum IFN-γ levels and increased splenic tachyzoite burdens compared with those injected i.v. with wild-type natural killer cells. Taken together, these findings demonstrate a critical role for natural killer cell intrinsic toll-like receptor-MyD88 signaling in IL-12-dependent early IFN-γ production and innate resistance to T. gondii." @default.
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- W2000571142 date "2014-06-01" @default.
- W2000571142 modified "2023-10-17" @default.
- W2000571142 title "Natural killer cell intrinsic toll-like receptor MyD88 signaling contributes to IL-12-dependent IFN-γ production by mice during infection with Toxoplasma gondii" @default.
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- W2000571142 doi "https://doi.org/10.1016/j.ijpara.2014.03.004" @default.
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