Donor-specific CD8+ Foxp3+ T cells protect skin allografts and facilitate induction of conventional CD4+ Foxp3+ regulatory T cells.

Donor-specific CD8+ Foxp3+ T cells protect skin allografts and facilitate induction of conventional CD4+ Foxp3+ regulatory T cells.
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DOI:
10.1111/j.1600-6143.2012.04120.x
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发表时间:
2012-09
期刊:
American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons
影响因子:
--
通讯作者:
Luo X
Luo X
中科院分区:
其他
文献类型:
--
作者:
Lerret NM;Houlihan JL;Kheradmand T;Pothoven KL;Zhang ZJ;Luo X

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CD4+调节性T细胞在移植耐受诱导中起着关键作用。CD8+抑制T细胞在临床前和临床模型中也被证明控制同种异体免疫反应。然而,CD8+抑制T细胞的确切性质、它们在同种异体移植中的诱导和作用机制仍不清楚。在这项研究中,我们表明,在IL-2、转化生长因子-β1和维甲酸的存在下,通过供体树突状细胞刺激初始的CD8+T细胞,可以诱导和显著扩增功能抑制的同种异体抗原特异性的CD8+FOXP3+T细胞。CD8+Foxp3+T细胞表达上调的CTLA-4、CCR4和CD103,抑制树突状细胞上共刺激分子的上调,并以供者特异性和接触依赖的方式抑制CD4和CD8T细胞的增殖和细胞因子的产生。重要的是,在过继转移时,诱导的CD8+Foxp3+T细胞保护完全MHC不匹配的同种异体皮肤移植物。在体内,CD8+Foxp3+T细胞优先转运到移植物引流的淋巴结,在那里它们诱导常规的CD4+Foxp3+T细胞,同时抑制效应性T细胞的增殖。我们认为供者特异性CD8+Foxp3+抑制性T细胞可以被诱导并作为一种有效的细胞疗法用于移植保护。
CD4+ regulatory T cells play a critical role in tolerance induction in transplantation. CD8+ suppressor T cells have also been shown to control alloimmune responses in pre-clinical and clinical models. However, the exact nature of the CD8+ suppressor T cells, their induction and mechanism of function in allogeneic transplantation remain elusive. In this study, we show that functionally suppressive, alloantigen-specific CD8+Foxp3+ T cells can be induced and significantly expanded by stimulating naive CD8+ T cells with donor dendritic cells in the presence of IL-2, TGF-β1, and retinoic acid. These CD8+Foxp3+ T cells express enhanced levels of CTLA-4, CCR4 and CD103, inhibit the up-regulation of co-stimulatory molecules on dendritic cells, and suppress CD4 and CD8 T cell proliferation and cytokine production in a donor-specific and contact-depended manner. Importantly, upon adoptive transfer, the induced CD8+Foxp3+ T cells protect full MHC-mismatched skin allografts. In vivo, the CD8+Foxp3+ T cells preferentially traffic to the graft draining lymph node where they induce conventional CD4+Foxp3+ T cells and concurrently suppress effector T cell expansion. We conclude that donor-specific CD8+Foxp3+ suppressor T cells can be induced and exploited as an effective form of cell therapy for graft protection in transplantation.
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