Second signals rescue B cells from activation-induced mitochondrial dysfunction and death.

Second signals rescue B cells from activation-induced mitochondrial dysfunction and death.
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DOI:
10.1038/s41590-018-0156-5
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发表时间:
2018-08
期刊:
影响因子:
30.5
通讯作者:
Pierce SK
Pierce SK
中科院分区:
医学1区
文献类型:
--
作者:
Akkaya M;Traba J;Roesler AS;Miozzo P;Akkaya B;Theall BP;Sohn H;Pena M;Smelkinson M;Kabat J;Dahlstrom E;Dorward DW;Skinner J;Sack MN;Pierce SK

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B细胞由两种时间上不同的信号激活,第一种信号由抗原结合到B细胞抗原受体(BCR)提供,第二种信号由T辅助细胞提供。在这里,我们表明,B细胞响应抗原迅速增加代谢活动,包括氧化磷酸化和糖酵解。在没有第二信号的情况下,B细胞逐渐丧失线粒体功能和糖酵解能力,导致细胞凋亡。线粒体功能障碍是细胞内钙通过钙应答激活的钙通道逐渐积累的结果,这在T辅助细胞或Toll样受体9信号传导结合B细胞抗原后约9小时内是可预防的。因此,BCR信号似乎激活了代谢程序,该程序施加了有限的时间窗口,在该时间窗口中,B细胞接收第二信号并存活或被消除。
B cells are activated by two temporally distinct signals, the first provided by antigen binding to the B cell antigen receptor (BCR) and the second by T helper cells. Here we show that B cells responded to antigen by rapidly increasing metabolic activity including both oxidative phosphorylation and glycolysis. In the absence of a second signal B cells progressively lost mitochondrial function and glycolytic capacity leading to apoptosis. Mitochondrial dysfunction was a result of the gradual accumulation of intracellular calcium through calcium response activated calcium channels that was preventable for approximately nine hours after B cell antigen binding by either T helper cells or Toll-like receptor 9 signaling. Thus, BCR signaling appears to activate a metabolic program that imposes a limited time window in which B cells either receive a second signal and survive or are eliminated.
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