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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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

Toll-like receptors (TLRs) recognize microbial pathogens and trigger innate immune responses. Among TLR family members, TLR7, TLR8, and TLR9 induce interferon (IFN)-alpha 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-alpha production was abolished in Irak-1-deficient mice, whereas inflammatory cytokine production was not impaired. Despite normal activation of NF-kappaB 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-alpha induction in pDCs.[1]

References

  1. Interleukin-1 receptor-associated kinase-1 plays an essential role for Toll-like receptor (TLR)7- and TLR9-mediated interferon-{alpha} induction. Uematsu, S., Sato, S., Yamamoto, M., Hirotani, T., Kato, H., Takeshita, F., Matsuda, M., Coban, C., Ishii, K.J., Kawai, T., Takeuchi, O., Akira, S. J. Exp. Med. (2005) [Pubmed]
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