CD152 (CTLA-4) determines the unequal resistance of Th1 and Th2 cells against activation-induced cell death by a mechanism requiring PI3 kinase function.

CD152 (CTLA-4) determines the unequal resistance of Th1 and Th2 cells against activation-induced cell death by a mechanism requiring PI3 kinase function.
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DOI:
10.1084/jem.20031058
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发表时间:
2004-03-15
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Brunner-Weinzierl MC
Brunner-Weinzierl MC
中科院分区:
其他
文献类型:
--
作者:
Pandiyan P;Gärtner D;Soezeri O;Radbruch A;Schulze-Osthoff K;Brunner-Weinzierl MC

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经历过抗原的 T 细胞的存活对于适应性免疫反应的产生至关重要。在这里,我们表明,辅助 T (Th) 效应细胞中 CD152(细胞毒性 T 淋巴细胞抗原 4)的遗传和抗体介导的失活以完全 Fas/Fas 配体 (FasL) 依赖的方式降低了非凋亡细胞的频率。 CD152 交联以及激活的 Th2 细胞上 CD3 和 CD28 的刺激可防止因 Fas 和 FasL 表达减少而导致的激活诱导的细胞死亡 (AICD)。 CD152 赋予的细胞凋亡保护与 Bcl-2 的上调相关,并由磷脂酰肌醇 3 激酶介导,后者通过 Forkhead 转录因子 FKHRL1 的抑制性磷酸化来阻止 FasL 表达。我们发现 CD152 诱导的信号直接作用于活化的 T 淋巴细胞,并且由于其在活化的 Th1 和 Th2 细胞上的差异表面表达,主要在 Th2 细胞中诱导对 AICD 的抵抗。
Survival of antigen-experienced T cells is essential for the generation of adaptive immune responses. Here, we show that the genetic and antibody-mediated inactivation of CD152 (cytotoxic T lymphocyte antigen 4) in T helper (Th) effector cells reduced the frequency of nonapoptotic cells in a completely Fas/Fas ligand (FasL)–dependent manner. CD152 cross-linking together with stimulation of CD3 and CD28 on activated Th2 cells prevented activation-induced cell death (AICD) as a result of reduced Fas and FasL expression. Apoptosis protection conferred by CD152 correlated with the up-regulation of Bcl-2 and was mediated by phosphatidylinositol 3 kinase, which prevented FasL expression through the inhibitory phosphorylation of Forkhead transcription factor FKHRL1. We show that signals induced by CD152 act directly on activated T lymphocytes and, due to its differential surface expression on activated Th1 and Th2 cells, induce resistance to AICD mainly in Th2 cells.
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