GILT modulates CD4+ T-cell tolerance to the melanocyte differentiation antigen tyrosinase-related protein 1.

GILT modulates CD4+ T-cell tolerance to the melanocyte differentiation antigen tyrosinase-related protein 1.
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DOI:
10.1038/jid.2011.236
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发表时间:
2012-01
影响因子:
6.5
通讯作者:
Hastings, K. Taraszka
Hastings, K. Taraszka
中科院分区:
医学1区
文献类型:
--
作者:
Rausch, Matthew P.;Hastings, K. Taraszka

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γ-干扰素诱导型溶酶体巯基还原酶(GILT)通过蛋白质二硫键的内吞还原促进MHC II类限制性加工,并且对于黑素细胞分化抗原酪氨酸酶相关蛋白1(TRP 1)的有效II类限制性加工是必需的。使用II类限制性,TRP 1特异性T细胞受体转基因小鼠,我们确定了一个新的作用GILT在维持耐受TRP 1。在GILT和TRP 1存在下,TRP 1特异性胸腺细胞中心缺失。相反,CD 4单阳性胸腺细胞和外周T细胞在GILT或TRP 1不存在的情况下发育,表明GILT是TRP 1特异性胸腺细胞的阴性选择所需的。虽然TRP 1特异性T细胞在GILT不存在的情况下逃避胸腺缺失,但它们对TRP 1具有耐受性并且不诱导Vilibrium。在缺乏GILT的情况下发育的TRP 1特异性T细胞具有减少的IL-2和IFN-γ产生。此外,与TRP 1缺陷小鼠相比,GILT缺陷小鼠的TRP 1特异性调节性T细胞百分比增加了四倍,并且调节性T细胞的消耗部分恢复了GILT缺陷TRP 1特异性CD 4 + T细胞诱导白癜风的能力。因此,GILT在调节CD 4 + T细胞对内源性皮肤限制性抗原的耐受性中起关键作用,该内源性皮肤限制性抗原与控制自身免疫和产生针对黑色素瘤的有效免疫疗法有关。
Gamma-interferon-inducible lysosomal thiol reductase (GILT) facilitates MHC class II-restricted processing though endocytic reduction of protein disulfide bonds and is necessary for efficient class II-restricted processing of melanocyte differentiation antigen, tyrosinase-related protein 1 (TRP1). Using class II-restricted, TRP1-specific T cell repector transgenic mice, we identify a novel role for GILT in the maintenance of tolerance to TRP1. TRP1-specific thymocytes are centrally deleted in the presence of GILT and TRP1. In contrast, CD4 single positive thymocytes and peripheral T cells develop in the absence of GILT or TRP1, demonstrating that GILT is required for negative selection of TRP1-specific thymocytes. Although TRP1-specific T cells escape thymic deletion in the absence of GILT, they are tolerant to TRP1 and do not induce vilitigo. TRP1-specific T cells that develop in the absence of GILT have diminished IL-2 and IFN-γ production. Furthermore, GILT-deficient mice have a four-fold increase in the percentage of TRP1-specific regulatory T cells compared to TRP1-deficient mice, and depletion of regulatory T cells partially restores the ability of GILT-deficient TRP1-specific CD4+ T cells to induce vitiligo. Thus, GILT plays a critical role in regulating CD4+ T cell tolerance to an endogenous skin-restricted antigen relevant to controlling autoimmunity and generating effective immunotherapy for melanoma.
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