Cutting Edge: Responder T cells regulate human DR+ effector regulatory T cell activity via granzyme B.

Cutting Edge: Responder T cells regulate human DR+ effector regulatory T cell activity via granzyme B.
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DOI:
10.4049/jimmunol.0900845
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发表时间:
2009-10-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Baecher-Allan C
Baecher-Allan C
中科院分区:
其他
文献类型:
--
作者:
Ashley CW;Baecher-Allan C

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MHC II类表达确定了人类CD4+ cd25highfoxp3高自然调节性T细胞(DR+ Tregs)的一个效应亚群,它诱导更快的抑制,并表现出比其他Treg群体更高的FoxP3表达。虽然已知Tregs对细胞凋亡高度敏感,但在本研究中,我们证明这种敏感性主要是DR+ Tregs的特征。颗粒酶B (Granzyme B, GzmB)在非调节性应答性CD4 T细胞中强烈表达,而效应性DR+ treg细胞表达GzmB较少。强烈的TCR刺激可显著增加所有分裂应答CD4 T细胞中GzmB的表达,并减轻DR+ Tregs对GzmB的抑制。如果GzmB被中和,DR+ Treg抑制活性会重新出现。我们发现应答细胞在强烈的TCR刺激下通过产生GzmB来主动杀死效应treg。因此,强烈激活的CD4 T细胞产生GzmB代表了CD4 T细胞抵抗Treg抑制的一种机制。
MHC class II expression identifies an effector subset of human CD4+CD25highFoxP3high natural regulatory T cells (DR+ Tregs) that induces more rapid suppression and exhibits higher FoxP3 expression than the remaining Treg population. Although Tregs are known to be highly sensitive to apoptosis, in this study we demonstrate that this sensitivity is primarily a feature of DR+ Tregs. Granzyme B (GzmB) is strongly expressed by nonregulatory responder CD4 T cells, whereas effector DR+ Tregs express little GzmB. Strong TCR stimulation markedly increases the expression of GzmB in all dividing responder CD4 T cells and mitigates the suppression by DR+ Tregs. DR+ Treg suppressive activity reemerges if GzmB is neutralized. We show that responder cells actively kill effector Tregs by producing GzmB in response to strong TCR stimulation. Thus, the production of GzmB by strongly activated CD4 T cells represents a mechanism by which CD4 T cells resist Treg suppression.
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