The TIGIT/CD226 axis regulates human T cell function.

The TIGIT/CD226 axis regulates human T cell function.
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DOI:
10.4049/jimmunol.1103627
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发表时间:
2012-04-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Hafler DA
Hafler DA
中科院分区:
其他
文献类型:
--
作者:
Lozano E;Dominguez-Villar M;Kuchroo V;Hafler DA

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TIGIT是一种在T细胞上表达的新发现的受体,它与树突状细胞表面的CD155结合,驱动它们产生更耐受的表型。鉴于TIGIT在其细胞内结构域含有ITIM基序,并考虑到TIGIT/CD226通路在人类自身免疫性疾病中的潜在重要性,我们研究了TIGIT在人类CD4+ T细胞中的具体作用。使用激动性抗tigit单抗,我们证明了对T细胞增殖的直接抑制作用,通过降低T-bet, GATA3, IRF4和RORc的表达,抑制细胞因子的产生,主要是IFNγ。shRNA敲低TIGIT表达导致T-bet和IFNγ mRNA和蛋白表达增加,同时IL-10表达降低。TIGIT敲低IFNγ的增加可以通过阻断CD226信号传导来克服,这表明TIGIT通过与CD226竞争相同的CD155配体来发挥免疫抑制作用。这些数据表明,TIGIT可以通过与CD226竞争抑制T细胞功能,也可以以T细胞固有的方式直接抑制T细胞。我们的研究结果为这种替代共刺激途径在调节与自身免疫性疾病相关的人类T细胞反应中的新作用提供了证据。
TIGIT is a newly identified receptor expressed on T cells that binds to CD155 on the dendritic cell surface driving them to a more tolerogenic phenotype. Given that TIGIT contains an ITIM motif in its intracellular domain and considering the potential importance of the TIGIT/CD226 pathway in human autoimmune disease, we investigated the specific role of TIGIT in human CD4+ T cells. Using an agonistic anti-TIGIT mAb, we demonstrate a direct inhibitory effect on T cell proliferation with a decrease in expression of T-bet, GATA3, IRF4 and RORc with inhibition of cytokine production, predominately IFNγ. Knockdown of TIGIT expression by shRNA resulted in an increase of both T-bet and IFNγ mRNA and protein expression with concomitant decrease in IL-10 expression. Increases in IFNγ with TIGIT knockdown could be overcome by blocking CD226 signaling indicating that TIGIT exerts immunosuppressive effects by competing with CD226 for the same CD155 ligand. These data demonstrate that TIGIT can inhibit T cell functions by competing with CD226 and can also directly inhibit T cells in a T cell intrinsic manner. Our results provide evidence for a novel role of this alternative co-stimulatory pathway in regulating human T cell responses associated with autoimmune disease.
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