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失去戈尔吉局部化的v-ATPase亚单元不会改变胰岛素颗粒的形成或胰腺小岛β细胞的功能
Cierra K Boyer1,2, Sandra E Blom2,3, Ashleigh E Machado2,3
1Department of Neuroscience and Pharmacology, University of Iowa, Iowa City, Iowa, United States.
American journal of physiology. Endocrinology and metabolism
|January 24, 2024
概括
改变β细胞中的戈尔吉 pH 会影响2型糖尿病中胰岛素颗粒的形成. 虽然v0a2淘汰赛部分中和了戈尔吉的pH值,但它不会影响亲胰岛素出口或葡萄糖恒温.
科学领域:
- 细胞生物学 细胞生物学
- 内分泌学 在内分泌学.
- 糖尿病研究 糖尿病研究
背景情况:
- 来自Golgi的延迟的亲胰岛素出口与2型糖尿病 (T2D) 中的胰岛素颗粒损失和β细胞功能障碍有关.
- 戈尔吉光层的酸化对于正确的亲胰岛素分类和分泌颗粒生物生成至关重要.
- 戈尔吉pH的失调是T2D中亲胰岛素贩运缺陷的潜在贡献者.
研究的目的:
- 研究戈尔吉的pH调节对β细胞功能和亲胰岛素贩运的作用.
- 为了检查破坏β细胞中的v-ATPase v0a2亚单元对戈尔吉pH和胰岛素分泌的影响.
主要方法:
- 产生了缺乏戈尔吉v-ATPase的v0a2亚单元的β细胞特异性淘汰 (KO) 小鼠.
- 在KO小鼠中评估了Golgi光的pH值,亲胰岛素的输出,胰岛素颗粒的形成和β细胞的功能.
- 评估葡萄糖耐受性,对饮食引起的肥胖的反应,以及体内胰岛素分泌反应.
主要成果:
- 失去v0a2亚单元部分中和了戈尔吉的pH值,并导致戈尔吉水箱膨胀.
- 亲胰岛素出口,胰岛素颗粒形成和β细胞功能不受v0a2 KO.的影响.
- 贝塔细胞v0a2KO小鼠表现出正常的葡萄糖耐受性,胰岛素分泌和体重增加反应.
结论:
- 在β细胞中,v0a2亚单元有助于戈尔吉的pH调节.
- 由于v0a2损失引起的Golgi光线的部分化不会影响亲胰岛素的流通或分泌.
- 除了戈尔吉的pH失调之外,还有其他因素可能导致糖尿病中观察到的亲胰岛素贩运缺陷.
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