通过VDAC1作用的胰岛素高分泌诱导体的向解卷,在β细胞中具有明显的转录基因特征
bioRxiv : the preprint server for biology
|January 7, 2025
概括
研究人员确定VDAC1是SW016789的目标,SW016789是一种导致胰岛素高分泌的分子. 这项研究揭示了β细胞对高分泌与ER压力的明显转录反应,为2型糖尿病机制提供了洞察力.
科学领域:
- 内分泌学和新陈代谢学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 在2型糖尿病 (T2D) 和先天性高胰岛素症 (HI) 中的高血糖导致由于胰岛素分泌增加而导致β细胞功能障碍.
- 胰岛素高分泌和随后的β细胞衰竭背后的机制仍然不完全理解.
- 之前的研究已经确定了像SW016789这样的小分子,可以诱导胰岛素的过分分泌和β细胞功能障碍,而不会导致细胞死亡.
研究的目的:
- 为了识别小分子SW016789.9的蛋白质标
- 进行一个时间过程的转录组分析,比较β细胞对高分泌和ER压力的反应.
- 研究ER相关降解 (ERAD) 在β细胞适应高分泌应激的作用.
主要方法:
- 用光亲和蛋白质组学,细胞热转移测定,siRNA和小分子抑制剂来识别SW016789的蛋白质标.
- 时间过程RNA测序 (RNAseq) 用于分析对SW016789和thapsigargin的反应中的转录变化.
- 进行了人类胰腺小岛的免疫分泌,以评估非糖尿病和T2D个体的ERAD成分分布.
主要成果:
- 确定并验证了VDAC1作为SW016789.9的直接蛋白质标.
- SW016789增加了膜潜力和 (Ca2+) 流入,可能通过VDAC1,导致胰岛素过分分泌.
- 与ER压力相比,高分泌诱导了明显的转录特征,其中涉及到与ER相关的降解 (ERAD) 途径.
- 在T2D小岛的β细胞中观察到ERAD组件SEL1L,HRD1和DERL3的分布变化.
结论:
- 通过SW016789介导的VDAC1激活增强了Ca2+的流入,驱动胰岛素的高分泌和独特的β细胞转录反应.
- 由于细胞内Ca2+升高而导致的慢性高分泌,会对β细胞功能产生负面影响.
- 这些发现突出了T2D中的ERAD变化,并通过了解β细胞的高分泌和反机制,提出了T2D和HI的潜在治疗点.
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