Interleukin-1 receptor-associated kinase-1 plays an essential role for Toll-like receptor (TLR)7- and TLR9-mediated interferon-{alpha} induction.

Interleukin-1 receptor-associated kinase-1 plays an essential role for Toll-like receptor (TLR)7- and TLR9-mediated interferon-{alpha} induction.
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DOI:
10.1084/jem.20042372
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发表时间:
2005-03-21
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Akira S
Akira S
中科院分区:
其他
文献类型:
--
作者:
Uematsu S;Sato S;Yamamoto M;Hirotani T;Kato H;Takeshita F;Matsuda M;Coban C;Ishii KJ;Kawai T;Takeuchi O;Akira S

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Toll样受体(TLR)识别微生物病原体并触发先天性免疫应答。在TLR家族成员中,TLR 7、TLR 8和TLR 9在浆细胞样树突状细胞(pDC)中诱导干扰素(IFN)-α。这种诱导需要形成由衔接子MyD 88、肿瘤坏死因子(TNF)受体相关因子6(TRAF 6)和IFN调节因子(IRF)7组成的复合物。在这里,我们显示了IL-1受体相关激酶(IRAK)-1在TLR 7和TLR 9介导的IRF 7信号通路中的重要作用。IRAK-1在体外直接结合并磷酸化IRF 7。IRAK-1的激酶活性是IRF 7转录激活所必需的。TLR 7和TLR 9介导的IFN-α的产生在Tumerik-1缺陷小鼠中被消除,而炎性细胞因子的产生没有受损。尽管NF-κB和丝裂原活化蛋白激酶正常活化,但IRF 7在pDCs中不被TLR 9配体活化。这些结果表明IRAK-1是pDC中TLR 7和TLR 9介导的IFN-α诱导的特异性调节剂。
Toll-like receptors (TLRs) recognize microbial pathogens and trigger innate immune responses. Among TLR family members, TLR7, TLR8, and TLR9 induce interferon (IFN)-α in plasmacytoid dendritic cells (pDCs). This induction requires the formation of a complex consisting of the adaptor MyD88, tumor necrosis factor (TNF) receptor-associated factor 6 (TRAF6) and IFN regulatory factor (IRF) 7. Here we show an essential role of IL-1 receptor-associated kinase (IRAK)-1 in TLR7- and TLR9-mediated IRF7 signaling pathway. IRAK-1 directly bound and phosphorylated IRF7 in vitro. The kinase activity of IRAK-1 was necessary for transcriptional activation of IRF7. TLR7- and TLR9-mediated IFN-α production was abolished in Irak-1–deficient mice, whereas inflammatory cytokine production was not impaired. Despite normal activation of NF-κB and mitogen-activated protein kinases, IRF7 was not activated by a TLR9 ligand in Irak-1–deficient pDCs. These results indicated that IRAK-1 is a specific regulator for TLR7- and TLR9-mediated IFN-α induction in pDCs.
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