Identification of cytolytic CD161- CD56+ regulatory CD8 T cells in human peripheral blood.

Identification of cytolytic CD161- CD56+ regulatory CD8 T cells in human peripheral blood.
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DOI:
10.1371/journal.pone.0059545
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Ritz J
Ritz J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hu D;Weiner HL;Ritz J

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我们先前开发了从正常人外周血建立CD8调节性T细胞(Treg)克隆的方法,并证明这些克隆能够杀死T细胞受体(TCR)激活的自体CD4 T细胞。基于CD8 Treg克隆的表型和功能表征,我们鉴定了正常人外周血中相应的内源性CD8 Treg群体。这些细胞在形态上表现为具有丰富细胞质的大淋巴细胞,并具有以下独特的表型:CD3+CD8+CD161−CD56+。大多数CD8 Treg表达CD45RA和CD62L,而CD45RO、CD25、CD27、CD28和CCR7低表达或阴性表达。与常规CD8 T细胞相比,CD8 Treg上的CD94和NKG2a表达升高。在体外活化后,该T细胞亚群能够杀死TCR活化的CD4 T细胞。这些研究鉴定了人体中的内源性CD 8 Treg群体,现在可以在各种临床条件下表征这些细胞。
We previously developed methods for establishing CD8 regulatory T cell (Treg) clones from normal human peripheral blood and demonstrated that these clones were capable of killing T cell receptor (TCR)-activated autologous CD4 T cells. Based on phenotypic and functional characterization of the CD8 Treg clones, we have identified a corresponding population of endogenous CD8 Treg in normal human peripheral blood. These cells appear morphologically as large lymphocytes with abundant cytoplasm and have the following unique phenotype: CD3+CD8+CD161−CD56+. The majority of CD8 Treg express CD45RA and CD62L with low or negative expression of CD45RO, CD25, CD27, CD28 and CCR7. The expression of CD94 and NKG2a on CD8 Treg was elevated compared to conventional CD8 T cells. Following in vitro activation, this T cell subset is capable of killing TCR-activated CD4 T cells. These studies identify an endogenous CD8 Treg population in humans and it will now be possible to characterize these cells in a variety of clinical conditions.
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