IL-17A-dependent CD4+CD25+ regulatory T cells promote immune privilege of corneal allografts.

IL-17A-dependent CD4+CD25+ regulatory T cells promote immune privilege of corneal allografts.
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DOI:
10.4049/jimmunol.1100101
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发表时间:
2011-06-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Niederkorn JY
Niederkorn JY
中科院分区:
其他
文献类型:
--
作者:
Cunnusamy K;Chen PW;Niederkorn JY

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IL-17 A是一种促炎细胞因子,由于其在几种自身免疫性疾病的发病机制中的作用而受到关注。IL-17 A还与心脏和肾同种异体移植物排斥有关。因此,我们假设IL-17 A的耗竭将提高角膜移植物的存活率。相反,我们的研究结果表明,在角膜移植的小鼠模型中阻断IL-17 A加速了克里思,并将同种异体移植排斥反应的发生率从50%增加到90%。我们描述了一种新的机制,通过这种机制,CD 4 + CD 25 + T调节细胞(TCRs)对IL-17 A产生应答,并提高角膜移植物的存活率。我们的研究结果表明:1)IL-17 A是眼免疫豁免所必需的; 2)IL-17 A不是诱导前房相关免疫偏离(ACAID)所必需的; 3)TCLs需要IL-17 A来介导接触依赖性抑制; 4)角膜移植物TCLs抑制免疫应答的传出臂并且是抗原特异性的; 5)TCLs不是角膜移植物存活超过30天所必需的;和6)角膜移植诱导的Treg介导的抑制是短暂的。我们的研究结果确定了IL-17 A作为维持角膜免疫豁免所必需的细胞因子,并建立了一个新的范例,即IL-17 A和CD 4 + CD 25 + T细胞之间的相互作用是角膜移植物存活所必需的。
IL-17A is a pro-inflammatory cytokine that has received attention for its role in the pathogenesis of several autoimmune diseases. IL-17A has also been implicated in cardiac and renal allograft rejection. Accordingly, we hypothesized that depletion of IL-17A would enhance corneal allograft survival. Instead, our results demonstrate that blocking IL-17A in a mouse model of keratoplasty accelerated the tempo and increased the incidence of allograft rejection from 50% to 90%. We describe a novel mechanism by which CD4+CD25+ T regulatory cells (Tregs) respond to IL-17A and enhance corneal allograft survival. Our findings suggest that: 1) IL-17A is necessary for ocular immune privilege; 2) IL-17A is not required for the induction of anterior chamber-associated immune deviation (ACAID); 3) Tregs require IL-17A to mediate a contact-dependent suppression; 4) corneal allograft Tregs suppress the efferent arm of the immune response and are antigen-specific; 5) Tregs are not required for corneal allograft survival beyond day 30; and 6) corneal allograft-induced Treg-mediated suppression is transient. Our findings identify IL-17A as a cytokine essential for the maintenance of corneal immune privilege and establish a new paradigm whereby interplay between IL-17A and CD4+CD25+ Tregs is necessary for survival of corneal allografts.
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