Nonclassical MHC class Ib-restricted cytotoxic T cells monitor antigen processing in the endoplasmic reticulum.

Nonclassical MHC class Ib-restricted cytotoxic T cells monitor antigen processing in the endoplasmic reticulum.
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非经典MHC类IB限制的细胞毒性T细胞监测内质网中的抗原加工。

DOI:
10.1038/ni.2282
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发表时间:
2012-04-22
期刊:
影响因子:
30.5
通讯作者:
Shastri, Nilabh
Shastri, Nilabh
中科院分区:
医学1区
文献类型:
--
作者:
Nagarajan, Niranjana A.;Gonzalez, Federico;Shastri, Nilabh

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与抗原处理相关的ER氨基肽酶ERAAP对于修剪MHC I分子呈递的多肽是必不可少的。巨细胞病毒对ERAAP的抑制可导致免疫逃避,ERAAP基因多态性与自身免疫性疾病相关。如何监测正常的ERAAP功能尚不清楚。我们发现,ERAAP抑制迅速诱导Qa-1b MHC Ib分子递送Fl9肽。在幼稚的小鼠中,QA-1b-FL9复合体的特异性抗原经历过的T细胞很常见。用ERAAP缺陷细胞免疫的野生型小鼠对Qa-1b-Fl9-复合体具有强大的CD8+T细胞反应。MHC Ib限制性细胞溶解效应器在体外和体内特异性地消除ERAAP缺陷细胞。因此,非经典的多肽-Qa-1b复合体将细胞毒性T细胞导向内质网中抗原处理缺陷的靶点。
The ER aminopeptidase associated with antigen processing, ERAAP, is essential for trimming peptides presented by MHC I molecules. ERAAP inhibition by cytomegalovirus causes immune evasion, and ERAAP polymorphisms are associated with autoimmune disorders. How normal ERAAP function is monitored is unknown. We found that ERAAP inhibition rapidly induced presentation of the FL9 peptide by the Qa-1b MHC Ib molecule. Antigen-experienced T cells specific for the Qa-1b-FL9 complex were frequent in naïve mice. Wild-type mice immunized with ERAAP-deficient cells mounted a potent CD8+ T cell response specific for the Qa-1b-FL9- complex. MHC Ib-restricted cytolytic effectors specifically eliminated ERAAP-deficient cells in vitro and in vivo. Thus, non-classical peptide-Qa-1b complexes direct cytotoxic T cells to targets with defective antigen processing in the ER.
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