TICAM-1/TRIF associates with Act1 and suppresses IL-17 receptor-mediated inflammatory responses.

TICAM-1/TRIF associates with Act1 and suppresses IL-17 receptor-mediated inflammatory responses.
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DOI:
10.26508/lsa.202101181
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发表时间:
2022-03
影响因子:
4.4
通讯作者:
Oshiumi H
Oshiumi H
中科院分区:
生物学2区
文献类型:
--
作者:
Miyashita Y;Kouwaki T;Tsukamoto H;Okamoto M;Nakamura K;Oshiumi H

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TICAM-1/TRIF是一种TLR3接头分子,与Act1结合可抑制IL-17RA与Act1之间的相互作用,从而减弱IL-17介导的炎症反应。TICAM-1(也称为TRIF)是TLR3识别双链RNA的唯一适配器。在此,我们报道TICAM-1不仅参与TLR3信号转导,而且还参与细胞因子受体IL-17RA信号转导。我们发现TICAM-1与IL-17R接头Act1结合可以抑制IL-17RA与Act1之间的相互作用。有趣的是,TICAM-1基因敲除促进了IL-17RA/Act1的相互作用,并增加了IL-17A介导的NF-κB和MAP激酶的激活,导致IL-17A刺激下炎性细胞因子和趋化因子的表达增强。此外,Ticam-1基因敲除增强了IL-17A介导的CXCL1和CXCL2在体内的表达,导致髓系细胞聚集。此外,Ticam-1基因敲除增强了迟发型超敏反应,并加重了实验性自身免疫性脑脊髓炎。Ticam-1基因敲除促进了EAE诱导的小鼠脊髓中髓系细胞和淋巴样细胞的聚集。总之,这些数据表明,TICAM-1抑制IL-17RA和Act1之间的相互作用,并在IL-17A介导的炎症反应中发挥负调控作用。
TICAM-1/TRIF, a TLR3 adaptor molecule, associates with Act1 to inhibit the interaction between IL-17RA and Act1, resulting in attenuated IL-17-mediated inflammatory responses. TICAM-1 (also called TRIF) is the sole adaptor of TLR3 that recognizes double-stranded RNA. Here, we report that TICAM-1 is involved not only in TLR3 signaling but also in the cytokine receptor IL-17RA signaling. We found that TICAM-1 bound to IL-17R adaptor Act1 to inhibit the interaction between IL-17RA and Act1. Interestingly, TICAM-1 knockout promoted IL-17RA/Act1 interaction and increased IL-17A–mediated activation of NF-κB and MAP kinases, leading to enhanced expression of inflammatory cytokines and chemokines upon IL-17A stimulation. Moreover, Ticam-1 knockout augmented IL-17A–mediated CXCL1 and CXCL2 expression in vivo, resulting in accumulation of myeloid cells. Furthermore, Ticam-1 knockout enhanced delayed type hypersensitivity and exacerbated experimental autoimmune encephalomyelitis. Ticam-1 knockout promoted accumulation of myeloid and lymphoid cells in the spinal cord of EAE-induced mice. Collectively, these data indicate that TICAM-1 inhibits the interaction between IL-17RA and Act1 and functions as a negative regulator in IL-17A–mediated inflammatory responses.
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