Cab45S inhibits the ER stress-induced IRE1-JNK pathway and apoptosis via GRP78/BiP.

Cab45S inhibits the ER stress-induced IRE1-JNK pathway and apoptosis via GRP78/BiP.
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Cab45S 通过 GRP78/BiP 抑制 ER 应激诱导的 IRE1-JNK 通路和细胞凋亡

DOI:
10.1038/cddis.2014.193
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发表时间:
2014-05-08
影响因子:
9
通讯作者:
--
中科院分区:
生物学1区
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--
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内质网(endoplasmic reticulum,ER)内稳态的紊乱会引起内质网应激,并导致未折叠蛋白反应的激活,从而在应激的早期阶段减轻应激并促进细胞存活,或在长期内质网应激下内稳态不能恢复时触发细胞死亡和凋亡。在这里,我们报告Cab 45 S,CREC家族的成员,抑制ER应激诱导的细胞凋亡。Cab 45 S的缺失增加肌醇需要激酶1(IRE 1)活性,从而在应激早期产生更多剪接形式的X-box结合蛋白1 mRNA,并导致c-Jun N-末端激酶磷酸化,最终诱导细胞凋亡。此外,我们发现Cab 45 S特异性地与78 kDa葡萄糖调节蛋白/免疫球蛋白重链结合蛋白(GRP 78/BiP)在其核苷酸结合结构域上相互作用。Cab 45 S可增强GRP 78/BiP蛋白水平,稳定GRP 78/BiP与IRE 1的相互作用,从而抑制ER应激诱导的IRE 1活化和凋亡。总之,Cab 45 S,GRP 78/BiP的一种新的调节剂,通过结合和升高GRP 78/BiP来抑制ER应激诱导的IRE 1活化和凋亡,并且在抑制ER应激诱导的凋亡中起作用。
Disturbance of endoplasmic reticulum (ER) homeostasis causes ER stress and leads to activation of the unfolded protein response, which reduces the stress and promotes cell survival at the early stage of stress, or triggers cell death and apoptosis when homeostasis is not restored under prolonged ER stress. Here, we report that Cab45S, a member of the CREC family, inhibits ER stress-induced apoptosis. Depletion of Cab45S increases inositol-requiring kinase 1 (IRE1) activity, thus producing more spliced forms of X-box-binding protein 1 mRNA at the early stage of stress and leads to phosphorylation of c-Jun N-terminal kinase, which finally induces apoptosis. Furthermore, we find that Cab45S specifically interacts with 78-kDa glucose-regulated protein/immunoglobulin heavy chain binding protein (GRP78/BiP) on its nucleotide-binding domain. Cab45S enhances GRP78/BiP protein level and stabilizes the interaction of GRP78/BiP with IRE1 to inhibit ER stress-induced IRE1 activation and apoptosis. Together, Cab45S, a novel regulator of GRP78/BiP, suppresses ER stress-induced IRE1 activation and apoptosis by binding to and elevating GRP78/BiP, and has a role in the inhibition of ER stress-induced apoptosis.
在条件X-box结合蛋白-1(XBP1)敲除小鼠中,从肝胰岛素抵抗中从肝胰岛素抵抗中解离肌醇提取酶(IRE1α)介导的C-JUN N末端激酶激活。
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