DIABETOLOGIA:小鼠细胞乙酰辅酶a羧化酶-1的破坏会影响胰岛素分泌和细胞质量

2019-04-04 不详 网络

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之前研究表明,胰腺细胞分泌胰岛素维持葡萄糖稳态,细胞衰竭是2糖尿病的一个标志。葡萄糖通过氧化线粒体途径触发β细胞的胰岛素分泌。然而,它也提供线粒体贫血的途径,驱动柠檬酸出口和乙酰辅酶a羧化酶1 (ACC1)产生胞质丙二酰辅酶a。这一途径被认为是一种替代的葡萄糖传感机制,主要由体外数据支持。在此,我们试图解决β细胞acc1偶联通路在体内胰岛素分泌和葡萄糖稳态中的作用。

研究人员利用Cre/loxP系统,在小鼠beta细胞中删除编码ACC1(胰岛ACC的主要亚型)AcacaAcaca液氧老鼠穿过Ins2cre老鼠(βACC1KO;终身β细胞基因删除)Pdx1creER老鼠(tmx-βACC1KO;在成体细胞中诱导基因缺失)。利用体内代谢生理学和体外胰岛实验评估细胞功能。用组织学技术分析细胞质量。

结果显示,βACC1KO tmx-βACC1KO小鼠葡萄糖不能容忍和体内胰岛素分泌缺陷。分离的胰岛研究发现,β细胞的胰岛素分泌受损,与先前作为放大信号的中性脂质的丰度变化无关。出人意料,胰腺形态测量学显示在βACC1KO小鼠β细胞减少,而 tmx-βACC1KO小鼠没有出现。随着雷帕霉素激酶(mTOR)依赖蛋白翻译通路的机制靶点蛋白水平的降低,这一效应得到了验证。

我们的研究表明,细胞acc1 -偶联通路在体内和体外对胰岛素分泌都是至关重要的,对葡萄糖稳态是必不可少的。我们进一步揭示了ACC1在成年前控制β细胞生长中的作用。

原始出处:

James CantleyAimee Davenport, Disruption of beta cell acetyl-CoA carboxylase-1 in mice impairs insulin secretion and beta cell mass

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    2019-09-22 baoya
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    2019-05-27 gwc392
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