c-FLIP protects T lymphocytes from apoptosis in the intrinsic pathway.

c-FLIP protects T lymphocytes from apoptosis in the intrinsic pathway.
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DOI:
10.4049/jimmunol.1400469
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发表时间:
2015-04-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
He YW
He YW
中科院分区:
其他
文献类型:
--
作者:
He MX;He YW

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细胞凋亡可以由质膜上的死亡受体(外源性途径)或基因组和/或细胞器的损伤(内源性途径)诱导。以往的研究表明,细胞半胱天冬酶8(FLICE)样抑制蛋白(c-FLIP)在T淋巴细胞死亡受体诱导的凋亡途径中促进细胞存活。独立于死亡受体信号传导,线粒体感知凋亡刺激并介导效应器半胱天冬酶的激活。c-FLIP是否调节依赖于细胞凋亡的信号仍不清楚。本研究在体外成熟T淋巴细胞中缺失c-FLIP基因,研究c-FLIP蛋白在内源性凋亡途径中的作用。在用内源性凋亡诱导剂处理的静息T细胞中,c-FLIP抑制线粒体释放细胞色素c。Bim缺失挽救了c-FLIP缺陷型T细胞中增强的凋亡,而caspase 8的抑制则没有。与活化的T细胞不同,c-FLIP缺陷的静息T细胞中没有坏死性凋亡或活性氧(ROS)增加。这些数据表明,c-FLIP是T淋巴细胞内在凋亡途径的负调节剂。
Apoptosis can be induced by either death receptors on the plasma membrane (extrinsic pathway), or the damage of the genome and/or cellular organelles (intrinsic pathway). Previous studies suggest that cellular caspase 8 (FLICE)-like inhibitory protein (c-FLIP) promotes cell survival in death receptor induced apoptosis pathway in T lymphocytes. Independent of death receptor signaling, mitochondria sense apoptotic stimuli and mediate the activation of effector caspases. Whether c-FLIP regulates mitochondrion-dependent apoptotic signals remains unknown. Here, c-FLIP gene was deleted in mature T lymphocytes in vitro, and the role of c-FLIP protein in intrinsic apoptosis pathway was studied. In resting T cells treated with the intrinsic apoptosis inducer, c-FLIP suppressed cytochrome c release from mitochondria. Bim-deletion rescued the enhanced apoptosis in c-FLIP-deficient T cells, while inhibition of caspase 8 did not. Different from activated T cells, there was no necroptosis or increase in reactive oxygen species (ROS) in c-FLIP-deficient resting T cells. These data suggest that c-FLIP is a negative regulator of intrinsic apoptosis pathway in T lymphocytes.
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