Analysis of adhesion molecules, target cells, and role of IL-2 in human FOXP3+ regulatory T cell suppressor function.

Analysis of adhesion molecules, target cells, and role of IL-2 in human FOXP3+ regulatory T cell suppressor function.
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DOI:
10.4049/jimmunol.0803827
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发表时间:
2009-03-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Shevach EM
Shevach EM
中科院分区:
其他
文献类型:
--
作者:
Tran DQ;Glass DD;Uzel G;Darnell DA;Spalding C;Holland SM;Shevach EM

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FOXP3+ 调节性 T 细胞 (Treg) 对于维持自我耐受和免疫稳态至关重要。 Treg 介导的抑制的作用机制和细胞靶点仍然存在争议。 Tregs 用来与其靶细胞相互作用的关键粘附分子尚未得到很好的表征。我们发现,人 CD4+FOXP3+CD25hi 细胞 (hTreg) 抑制小鼠应答细胞的激活与小鼠 Tregs 一样有效。 hTreg 上的 LFA-1 (CD11a/CD18) 对于其抑制功能至关重要,因为抑制可以通过阻断抗 hCD11a 或 -hCD18 mAb 来逆转。 LFA-1 缺陷患者的 Tregs 无法抑制人类和小鼠的反应。缺乏 ICAM-1 的小鼠 CD4+ T 细胞可以被 hTreg 抑制,表明 hTreg 通过人 LFA-1 与小鼠 ICAM-1 的结合来靶向小鼠 DC。将小鼠 DC 与 hTreg 共培养,但不与来自 LFA-1 缺陷患者的 hTreg 共培养,可阻止 DC 上 CD80/CD86 的上调及其激活应答 T 细胞的能力。最后,在最佳刺激条件下,IL-2 并不是 hTreg 抑制功能所必需的,并且 IL-2 的消耗在 hTreg 介导的抑制中不起任何作用。总而言之,Treg 介导的抑制功能的机制之一跨物种发挥作用,并介导 Treg 和 DC 之间依赖 LFA-1/ICAM-1 的相互作用。
FOXP3+ regulatory T cells (Tregs) are central to the maintenance of self-tolerance and immune homeostasis. The mechanisms of action and cellular targets for Treg mediated suppression remain controversial. The critical adhesion molecules utilized by Tregs for the interaction with their target cells have not been well characterized. We show that human CD4+FOXP3+CD25hi cells (hTregs) suppress the activation of mouse responders as efficiently as mouse Tregs. LFA-1 (CD11a/CD18) on the hTregs is critical for their suppressor function, since suppression can be reversed with blocking anti-hCD11a or -hCD18 mAb. Tregs from patients with LFA-1 deficiency fail to suppress human and mouse responders. Mouse CD4+ T cells deficient in ICAM-1 can be suppressed by hTregs, indicating that the hTregs target mouse DCs through the binding of human LFA-1 to mouse ICAM-1. Co-culture of mouse DCs with hTregs, but not hTregs from LFA-1 deficient patients, prevented the upregulation of CD80/CD86 on the DCs and their capacity to activate responder T cells. Lastly, IL-2 is not required for hTreg suppressor function under optimal stimulatory condition and IL-2 consumption plays no role in hTreg-mediated suppression. Taken together, one of the mechanisms of Treg-mediated suppression functions across species and mediates an LFA-1/ICAM-1 dependent interaction between Tregs and DCs.
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