Cbl-b deficiency prevents functional but not phenotypic T cell anergy.

Cbl-b deficiency prevents functional but not phenotypic T cell anergy.
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Cbl-b缺陷可预防功能性而非表型T细胞无能。

DOI:
10.1084/jem.20202477
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发表时间:
2021-07-05
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Weiss A
Weiss A
中科院分区:
其他
文献类型:
--
作者:
Nguyen TTT;Wang ZE;Shen L;Schroeder A;Eckalbar W;Weiss A

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T细胞无能是防止自身免疫的重要外周耐受机制。Nguyen等人发现T细胞无反应性在外周而不是在胸腺中发展,并且依赖于Cbl-b而不是Grail或PD-1。T细胞无能是一种重要的外周免疫耐受机制。我们研究了如何建立T细胞无能使用无能模型,其中Zap 70超形态突变体W131 A与OTII TCR转基因(W131 AOTII)共表达。无反应性是在外周建立的,而不是在胸腺。与成熟外周CD 4 T细胞中富集的耐受性基因特征和受损的TCR信号相反,W131 AOTII小鼠中的CD 4SP胸腺细胞表现出正常的TCR信号。重要的是,在W131 AOTII小鼠中T细胞无反应性的维持需要通过MHC-II的抗原呈递。我们研究了抑制性受体PD-1和E3泛素连接酶Cbl-b和Grail在该模型中的功能重要性。每种基因的缺失都不影响无反应性T细胞表型标志物的表达或T reg数量。然而,W131 AOTII小鼠中Cbl-b的缺失(而不是Grail或PD-1的缺失)恢复了T细胞反应性和信号传导。因此,Cbl-b在建立和/或维持T细胞无反应性中的无反应性中起重要作用。
T cell anergy is an important peripheral tolerance mechanism to prevent autoimmunity. Nguyen et al. find that T cell anergy develops in the periphery, not in the thymus, and depends upon Cbl-b but not Grail or PD-1. T cell anergy is an important peripheral tolerance mechanism. We studied how T cell anergy is established using an anergy model in which the Zap70 hypermorphic mutant W131A is coexpressed with the OTII TCR transgene (W131AOTII). Anergy was established in the periphery, not in the thymus. Contrary to enriched tolerance gene signatures and impaired TCR signaling in mature peripheral CD4 T cells, CD4SP thymocytes exhibited normal TCR signaling in W131AOTII mice. Importantly, the maintenance of T cell anergy in W131AOTII mice required antigen presentation via MHC-II. We investigated the functional importance of the inhibitory receptor PD-1 and the E3 ubiquitin ligases Cbl-b and Grail in this model. Deletion of each did not affect expression of phenotypic markers of anergic T cells or T reg numbers. However, deletion of Cbl-b, but not Grail or PD-1, in W131AOTII mice restored T cell responsiveness and signaling. Thus, Cbl-b plays an essential role in the establishment and/or maintenance of unresponsiveness in T cell anergy.
ZAP-70 的亚等位基因揭示了自身免疫性疾病与自身免疫反应性的不同胸腺阈值。
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