Severe impairment of interleukin-1 and toll-like receptor signalling in mice lacking IRAK-4

Nobutaka Suzuki, Shinobu Suzuki, Gordon S. Duncan, Douglas G. Millar, Teiji Wada, Christine Mirtsos, Hidetoshi Takada, Andrew Wakeham, Annick Itie, Shyun Li, Josef M. Penninger, Holger Wesche, Pamela S. Ohashi, Tak W. Mak, Wen Chen Yeh

    Research output: Contribution to journalArticlepeer-review


    Toll-like receptors (TLRs), which recognize pathogen-associated molecular patterns, and members of the pro-inflammatory interleukin-1 receptor (IL-1R) family, share homologies in their cytoplasmic domains called Toll/IL-IR/plant R gene homology (TIR) domains. Intracellular signalling mechanisms mediated by TIRs are similar, with MyD88 (refs 5-8) and TRAF6 (refs 9, 10) having critical roles. Signal transduction between MyD88 and TRAF6 is known to involve the serine-threonine kinase IL-1 receptor-associated kinase 1 (IRAK-1) and two homologous proteins, IRAK-2 (ref. 12) and IRAK-M. However, the physiological functions of the IRAK molecules remain unclear, and gene-targeting studies have shown that IRAK-1 is only partially required for IL-1R and TLR signalling. Here we show by genetargeting that IRAK-4, an IRAK molecule closely related to the Drosophila Pelle protein, is indispensable for the responses of animals and cultured cells to IL-1 and ligands that stimulate various TLRs. IRAK-4-deficient animals are completely resistant to a lethal dose of lipopolysaccharide (LPS). In addition, animals lacking IRAK-4 are severely impaired in their responses to viral and bacterial challenges. Our results indicate that IRAK-4 has an essential role in innate immunity.
    Original languageEnglish
    Pages (from-to)750-754
    Number of pages4
    Issue number6882
    Publication statusPublished - 18 Apr 2002


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