BAX inhibitor-1 is a negative regulator of the ER stress sensor IRE1alpha.

BAX inhibitor-1 is a negative regulator of the ER stress sensor IRE1alpha.
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DOI:
10.1016/j.molcel.2009.02.017
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发表时间:
2009-03-27
期刊:
影响因子:
16
通讯作者:
Hetz, Claudio
Hetz, Claudio
中科院分区:
生物学1区
文献类型:
--
作者:
Lisbona, Fernanda;Rojas-Rivera, Diego;Thielen, Peter;Zamorano, Sebastian;Todd, Derrick;Martinon, Fabio;Glavic, Alvaro;Kress, Christina;Lin, Jonathan H.;Walter, Peter;Reed, John C.;Glimcher, Laurie H.;Hetz, Claudio

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对内质网(ER)应激的适应依赖于被称为未折叠蛋白反应(UPR)的整合信号转导途径的激活。Bax抑制剂-1(BI-1)是一种进化上保守的抑制细胞死亡的ER驻留蛋白。在这里,我们研究了BI-1在普遍定期审议中的作用。在雌激素受体应激的果蝇和小鼠模型中,BI-1表达抑制IRE 1 α活性。BI-1缺陷细胞表现出ER应激传感器IRE 1 α的超活化,导致其下游靶X-Box结合蛋白-1(XBP-1)水平升高和UPR靶基因上调。这种表型与BI-1和IRE 1 α之间形成稳定的蛋白质复合物有关,降低了其核糖核酸酶活性。最后,BI-1缺乏增加了原代B细胞的分泌活性,这是一种受XBP-1调节的现象。我们的研究结果表明,BI-1的一个新的作用,在早期适应性反应对ER压力,其已知的下游功能在细胞凋亡。
Adaptation to endoplasmic reticulum (ER) stress depends on the activation of an integrated signal transduction pathway known as the unfolded protein response (UPR). Bax inhibitor-1 (BI-1) is an evolutionarily conserved ER-resident protein that suppresses cell death. Here we have investigated the role of BI-1 in the UPR. BI-1 expression suppressed IRE1α activity in fly and mouse models of ER stress. BI-1 deficient cells displayed hyperactivation of the ER stress sensor IRE1α, leading to increased levels of its downstream target X-Box binding protein-1 (XBP-1) and upregulation of UPR target genes. This phenotype was associated with the formation of a stable protein complex between BI-1 and IRE1α, decreasing its ribonuclease activity. Finally, BI-1 deficiency increased the secretory activity of primary B cells, a phenomenon regulated by XBP-1. Our results suggest a new role for BI-1 in early adaptive responses against ER stress which contrasts with its known downstream function in apoptosis.
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