Human thymic MR1-restricted MAIT cells are innate pathogen-reactive effectors that adapt following thymic egress.

Human thymic MR1-restricted MAIT cells are innate pathogen-reactive effectors that adapt following thymic egress.
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DOI:
10.1038/mi.2012.45
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发表时间:
2013-01
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影响因子:
8
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--
中科院分区:
医学1区
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人粘膜相关不变 T (MAIT) 细胞表达半不变 T 细胞受体 Vα7.2,并受到 MHC-Ib 分子 MR1 的限制。虽然 MAIT 细胞与其他先天性 T 细胞有相似之处,但 MAIT 细胞的先天程度及其适应能力尚不清楚。我们评估了来自胸腺、脐带血和外周血的 Vα7.2+ T 细胞的功能。虽然未经历过抗原的 MAIT 细胞表现出幼稚表型,但它们具有响应结核分枝杆菌感染细胞的内在效应能力。 Vα7.2+ 效应胸腺细胞含有 sjTREC,表明复制和胸腺起源有限。在评估 Mtb 反应性 MAIT 细胞的适应能力时,我们发现外周血中的 MAIT 细胞表现出记忆表型,并且经历了大幅扩增,表明它们对抗原刺激有反应。 MAIT 细胞是一种进化上保守的 T 细胞子集,可检测各种细胞内感染,具有先天性免疫和适应性免疫的共同特征。
Human mucosal-associated invariant T (MAIT) cells express the semi-invariant T cell receptor Vα7.2 and are restricted by the MHC-Ib molecule MR1. While MAIT cells share similarities with other innate T cells the extent to which MAIT cells are innate and their capacity to adapt is unknown. We evaluated the function of Vα7.2+ T cells from the thymus, cord blood, and peripheral blood. While antigen-inexperienced MAIT cells displayed a naive phenotype these had intrinsic effector capacity in response to Mycobacterium tuberculosis infected cells. Vα7.2+ effector thymocytes contained sjTREC suggesting limited replication and thymic origin. In evaluating the capacity of Mtb-reactive MAIT cells to adapt, we found that those from peripheral blood demonstrated a memory phenotype and had undergone substantial expansion suggesting they responded to antigenic stimulation. MAIT cells, an evolutionarily conserved T cell subset that detects a variety of intracellular infections, share features of innate and adaptive immunity.
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