Immunodominance of a low-affinity major histocompatibility complex-binding myelin basic protein epitope (residues 111-129) in HLA-DR4 (B1*0401) subjects is associated with a restricted T cell receptor repertoire.

Immunodominance of a low-affinity major histocompatibility complex-binding myelin basic protein epitope (residues 111-129) in HLA-DR4 (B1*0401) subjects is associated with a restricted T cell receptor repertoire.
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HLA-DR4 (B1*0401) 受试者中低亲和力主要组织相容性复合物结合髓磷脂碱性蛋白表位(残基 111-129)的免疫优势与受限的 T 细胞受体库相关。

DOI:
10.1172/jci119539
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发表时间:
1997
期刊:
The Journal of clinical investigation
影响因子:
--
通讯作者:
Roland Martin
Roland Martin
中科院分区:
--
文献类型:
--
作者:
Paolo A. Muraro;M. Vergelli;M. Kalbus;Darhlene E. Banks;James W. Nagle;L. Tranquill;G. T. Nepom;W. Biddison;Henry F. McFarland;Roland Martin

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多发性硬化症(MS)的发病机制目前部分归因于T细胞介导的针对髓鞘成分的过程。在HLA-DR15Dw2的背景下,T细胞对候选自身抗原髓鞘碱性蛋白(MBP)的反应已经被详细研究过。然而,在其他MS相关的HLA-DR单倍型的背景下,细胞免疫的特征鲜为人知。从人类白细胞抗原DR4(B1*0401)阳性的多发性硬化症受试者中获得MBP特异性T细胞系(TCL)。在275MBP的特定TCL中,178(。7%)特异性识别区域MBP(111-129),主要在DRB1*0401的背景下。识别MBP的主要T细胞表位对应于残基MBP(116-123)。这些TCL表现出不同的细胞因子分泌和细胞毒性。另一方面,T细胞受体分析显示重排的异质性非常有限。与MBP(81-99)不同,MBP(81-99)与HLADR15具有高亲和力,并被多种T细胞识别,而MBP(111-129)与DRB1*0401结合较弱,这表明只有高亲和力的T细胞受体才能有效地结合这种不稳定的MHC/肽复合体,从而解释了我们观察到的T细胞受体限制。这项研究为MBP的识别提供了新的见解,并为人类自身抗原T细胞表位的免疫优势提出了一种替代机制。
The pathogenesis of multiple sclerosis (MS) is currently ascribed in part to a T cell-mediated process targeting myelin components. The T cell response to one candidate autoantigen, myelin basic protein (MBP), in the context of HLA-DR15Dw2, has been previously studied in detail. However, the characteristics of cellular immunity in the context of other MS-associated HLA-DR haplotypes are scarcely known. MBP-specific T cell lines (TCL) were generated from HLA-DR4 (B1*0401)-positive MS subjects. Out of 275 MBP-specific TCL, 178 (64. 7%) specifically recognized region MBP(111-129), predominantly in the context of DRB1*0401. The major T cell epitope for MBP recognition corresponded to residues MBP(116-123). These TCL expressed disparate profiles of cytokine secretion and cytotoxicity. T cell receptor analysis, on the other hand, revealed a strikingly limited heterogeneity of rearrangements. In contrast to MBP(81-99), which binds with high affinity to HLA-DR15 and is recognized by a diverse T cell repertoire, MBP(111-129) binds weakly to DRB1*0401, suggesting that only high affinity T cell receptors might be able to efficiently engage such unstable MHC/peptide complexes, thus accounting for the T cell receptor restriction we observed. This study provides new insight about MBP recognition and proposes an alternative mechanism for immunodominance of self-antigen T cell epitopes in humans.
髓磷脂碱性蛋白肽与 II 类 MHC 分子 I-Au 和 I-Ak 形成复合物,并在中性 pH 条件下快速解离。
DOI: --
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