The VDAC2-BAK rheostat controls thymocyte survival.

The VDAC2-BAK rheostat controls thymocyte survival.
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DOI:
10.1126/scisignal.2000274
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发表时间:
2009-08-25
期刊:
影响因子:
7.3
通讯作者:
Cheng EH
Cheng EH
中科院分区:
生物学1区
文献类型:
--
作者:
Ren D;Kim H;Tu HC;Westergard TD;Fisher JK;Rubens JA;Korsmeyer SJ;Hsieh JJ;Cheng EH

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促凋亡蛋白BAX和巴克构成线粒体凋亡门户,其在整合死亡信号后执行细胞死亡。致死性巴克由电压依赖性阴离子通道2(VDAC 2)(一种利多卡因限制性VDAC亚型)控制。在这里,我们提供的证据表明,VADC 2-巴克复合物在体内胸腺细胞的生存决定的关键作用。胸腺中Vdac 2的遗传耗竭导致过度细胞死亡和对包括T细胞受体参与在内的各种死亡刺激的超敏反应。这些表型完全由同时缺失巴克而不是Bax所拯救。因此,VDAC 2-巴克轴提供了一种控制胸腺细胞稳态的机制。我们的研究揭示了一个复杂的内置变阻器,可能微调免疫能力,以平衡自身免疫和免疫缺陷。
The proapoptotic proteins BAX and BAK constitute the mitochondrial apoptotic gateway that executes cellular demise after integrating death signals. The lethal BAK is kept in check by voltage-dependent anion channel 2 (VDAC2), a mammalian-restricted VDAC isoform. Here, we provide evidence showing a critical role for the VADC2-BAK complex in determining thymocyte survival in vivo. Genetic depletion of Vdac2 in the thymus resulted in excessive cell death and hypersensitivity to diverse death stimuli including engagement of the T cell receptor. These phenotypes were completely rescued by the concurrent deletion of Bak but not that of Bax. Thus, the VDAC2-BAK axis provides a mechanism that governs the homeostasis of thymocytes. Our study reveals a sophisticated built-in rheostat that likely fine-tunes immune competence to balance autoimmunity and immunodeficiency.
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