Novel CD8+ Treg suppress EAE by TGF-beta- and IFN-gamma-dependent mechanisms.

Novel CD8+ Treg suppress EAE by TGF-beta- and IFN-gamma-dependent mechanisms.
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DOI:
10.1002/eji.200939441
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发表时间:
2009-12
影响因子:
5.4
通讯作者:
Weiner, Howard L.
Weiner, Howard L.
中科院分区:
医学3区
文献类型:
--
作者:
Chen, Mei-Ling;Yan, Bo-Shiun;Kozoriz, Deneen;Weiner, Howard L.

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虽然CD8+Treg介导的抑制作用已经被描述,但CD8+Treg的特征仍然很差。在这里,我们发现了一个新的CD8+Treg亚群,它在其细胞表面(CD8+LAP+细胞)上表达潜伏期相关肽(LAP),并在体外和体内显示出调节活性。只有一小部分CD8+LAP+细胞表达Foxp3或CD25,尽管这些细胞的Foxp3表达水平高于其相应的LAP−。除了转化生长因子-β外,CD8+LAP+细胞还产生干扰素-γ,这些细胞抑制依赖转化生长因子-β和干扰素-γ的EAE。在过继共转移模型中,CD8+LAP+细胞通过诱导或扩增FOXP3+细胞以及体内抑制增殖和干扰素-γ的产生来抑制髓鞘少突胶质细胞糖蛋白(MOG)特异性的免疫反应。此外,体内中和干扰素-γ和对干扰素-γ缺陷小鼠的研究表明,干扰素-γ的产生在CD8+LAP+细胞的功能中起着重要作用。我们的发现确定了CD8+T细胞免疫调节活性的潜在机制,并提示诱导或扩增CD8+LAP+细胞可能是帮助控制自身免疫过程的一种治疗策略。
Although CD8+ Treg-mediated suppression has been described, CD8+ Treg remain poorly characterized. Here we identify a novel subset of CD8+ Treg that express latency-associated peptide (LAP) on their cell surface (CD8+LAP+ cells) and exhibit regulatory activity in vitro and in vivo. Only a small fraction of CD8+LAP+ cells express Foxp3 or CD25, although the expression levels of Foxp3 for these cells are higher than their LAP− counterparts. In addition to TGF-β, CD8+LAP+ cells produce IFN-γ, and these cells suppress EAE that is dependent on both TGF-β and IFN-γ. In an adoptive co-transfer model, CD8+LAP+ cells suppress myelin oligodendrocyte glycoprotein (MOG)-specific immune responses by inducing or expanding Foxp3+ cells and by inhibiting proliferation and IFN-γ production in vivo. Furthermore, in vivo neutralization of IFN-γ and studies with IFN-γ-deficient mice demonstrate an important role for IFN-γ production in the function of CD8+LAP+ cells. Our findings identify the underlying mechanisms that account for the immunoregulatory activity of CD8+ T cells and suggest that induction or amplification of CD8+LAP+ cells may be a therapeutic strategy to help control autoimmune processes.
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