cTAGE5 deletion in pancreatic β cells impairs proinsulin trafficking and insulin biogenesis in mice.

cTAGE5 deletion in pancreatic β cells impairs proinsulin trafficking and insulin biogenesis in mice.
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胰腺 β 细胞中的 cTAGE5 缺失会损害小鼠胰岛素原运输和胰岛素生物发生。

DOI:
10.1083/jcb.201705027
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发表时间:
2017-12-04
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Xu Z
Xu Z
中科院分区:
其他
文献类型:
--
作者:
Fan J;Wang Y;Liu L;Zhang H;Zhang F;Shi L;Yu M;Gao F;Xu Z

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在这项研究中,Fan等人表明,cTAGE 5与v-SNARE Sec 22 b相互作用,调节胰岛素原加工和COPII依赖性从ER到高尔基体的运输,从而影响葡萄糖耐量。胰岛素原在胰腺β细胞的内质网(ER)中合成,并转运至高尔基体进行适当加工并分泌至血浆中。胰岛素生物合成的缺陷可能导致糖尿病。然而,胰岛素原转运的潜在机制仍不完全清楚。我们发现,β细胞特异性缺失cTAGE 5,也称为Mea 6,导致ER应激增加,胰腺中胰岛素生物合成减少,以及小鼠严重的葡萄糖耐受不良。我们发现cTAGE 5/MEA 6与囊泡膜可溶性N-乙基马来酰亚胺敏感因子附着蛋白受体Sec 22 b相互作用。Sec 22 b及其与cTAGE 5/MEA 6的相互作用对胰岛素原加工至关重要。cTAGE 5/MEA 6可能与Sec 22 b协同控制COPII囊泡从ER的释放,从而控制胰岛素原从ER向高尔基体的运输。重要的是,在β细胞中转基因表达人cTAGE 5/MEA 6不仅可以挽救胰岛结构的缺陷,而且可以挽救cTAGE 5/Mea 6条件性敲除背景下的胰岛素生物合成功能障碍和葡萄糖耐受不良。总之,我们的数据提供了更多的洞察胰岛素原运输途径的潜在机制。
In this study, Fan et al. show that cTAGE5 interacts with the v-SNARE Sec22b to regulate proinsulin processing and COPII-dependent trafficking from the ER to the Golgi, thereby influencing glucose tolerance. Proinsulin is synthesized in the endoplasmic reticulum (ER) in pancreatic β cells and transported to the Golgi apparatus for proper processing and secretion into plasma. Defects in insulin biogenesis may cause diabetes. However, the underlying mechanisms for proinsulin transport are still not fully understood. We show that β cell–specific deletion of cTAGE5, also known as Mea6, leads to increased ER stress, reduced insulin biogenesis in the pancreas, and severe glucose intolerance in mice. We reveal that cTAGE5/MEA6 interacts with vesicle membrane soluble N-ethyl-maleimide sensitive factor attachment protein receptor Sec22b. Sec22b and its interaction with cTAGE5/MEA6 are essential for proinsulin processing. cTAGE5/MEA6 may coordinate with Sec22b to control the release of COPII vesicles from the ER, and thereby the ER-to-Golgi trafficking of proinsulin. Importantly, transgenic expression of human cTAGE5/MEA6 in β cells can rescue not only the defect in islet structure, but also dysfunctional insulin biogenesis and glucose intolerance on cTAGE5/Mea6 conditional knockout background. Together our data provide more insight into the underlying mechanism of the proinsulin trafficking pathway.
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