Requirements for CD1d recognition by human invariant Valpha24+ CD4-CD8- T cells.

Requirements for CD1d recognition by human invariant Valpha24+ CD4-CD8- T cells.
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DOI:
10.1084/jem.186.1.109
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发表时间:
1997-07-07
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Porcelli S
Porcelli S
中科院分区:
其他
文献类型:
--
作者:
Exley M;Garcia J;Balk SP;Porcelli S

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已鉴定出人类CD4 - CD8 - T细胞的一个亚群,其表达一种恒定的Vα24 - JαQ T细胞受体(TCR)-α链,主要与Vβ11配对。一系列这些Vα24 Vβ11克隆显示具有TCR - β CDR3多样性,并表达自然杀伤(NK)基因座编码的C型凝集素NKR - P1A、CD94和CD69。然而,与NK细胞不同的是,它们不表达杀伤抑制受体、CD16、CD56或CD57。所有恒定的Vα24⁺克隆都能识别MHC I类样CD1d分子,并区分CD1d和其他密切相关的人类CD1蛋白,这表明识别是由TCR介导的。识别不依赖于CD1d胞质尾中的内体靶向基序。在被抗CD3或CD1d激活后,这些克隆产生Th1和Th2两种细胞因子。这些结果表明,人类恒定的Vα24⁺ CD4 - CD8 - T细胞,以及推测的同源小鼠NK1⁺ T细胞群,对CD1d有反应,且在功能上与NK细胞不同。这种细胞群以及CD1d配体在物种间的保守性表明其具有重要的免疫功能。
A subset of human CD4−CD8− T cells that expresses an invariant Vα24-JαQ T cell receptor (TCR)-α chain, paired predominantly with Vβ11, has been identified. A series of these Vα24 Vβ11 clones were shown to have TCR-β CDR3 diversity and express the natural killer (NK) locus–encoded C-type lectins NKR-P1A, CD94, and CD69. However, in contrast to NK cells, they did not express killer inhibitory receptors, CD16, CD56, or CD57. All invariant Vα24+ clones recognized the MHC class I–like CD16 molecule and discriminated between CD1d and other closely related human CD1 proteins, indicating that recognition was TCR-mediated. Recognition was not dependent upon an endosomal targeting motif in the cytoplasmic tail of CD1d. Upon activation by anti-CD3 or CD1d, the clones produced both Th1 and Th2 cytokines. These results demonstrate that human invariant Vα24+ CD4−CD8− T cells, and presumably the homologous murine NK1+ T cell population, are CD1d reactive and functionally distinct from NK cells. The conservation of this cell population and of the CD1d ligand across species indicates an important immunological function.
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