成人的时钟调节器将昼夜节律与胰腺β细胞成熟联系起来
Ana P Montalvo Landivar1,2, Zihan Gao3,4,5,2, Mai Liu3,4,5,2
1Department of Neurosurgery, Brigham and Women's Hospital; Boston, MA 02115, USA.
bioRxiv : the preprint server for biology
|August 23, 2023
概括
时钟因子DEC1对于成年小岛贝塔细胞成熟和葡萄糖控制至关重要. 它的缺失会导致终身的葡萄糖不耐受性,因为它将胰岛素分泌与新陈代谢脱.
科学领域:
- 内分泌学 在内分泌学.
- 时间生物学 时间生物学
- 代谢研究的研究.
背景情况:
- 昼夜时钟调节了每天的新陈代谢节奏.
- 代谢组织的成熟,如胰腺岛贝塔细胞,对于葡萄糖平衡至关重要.
- 生物钟组件在β细胞成熟中的作用尚不清楚.
研究的目的:
- 研究DEC1的作用,一个昼夜转录因子,在成年岛屿β细胞的成熟和功能.
- 了解DEC1如何将昼夜节律与葡萄糖代谢和胰岛素分泌相结合.
- 阐明DEC1影响β细胞生物能和葡萄糖反应的机制.
主要方法:
- 在成年老鼠岛屿β细胞中对DEC1表达的分析.
- 具有和没有DEC1.1的β细胞的基因表达概况.
- 在DEC1缺乏的小鼠中评估葡萄糖耐受性和胰岛素分泌.
- 在β细胞中测量线粒体功能和代谢流量.
主要成果:
- 在成年β细胞中诱导DEC1,并同步能量和分泌节律.
- DEC1结合并调节与成熟度相关的基因,将胰岛素外细胞与能量代谢相结合.
- 由于胰岛素分泌与葡萄糖代谢的合受损,β细胞中DEC1的丧失导致终身葡萄糖不耐受和胰岛素缺乏.
- DEC1 缺乏导致β细胞成熟迟缓,其特征是昼夜生物能学,葡萄糖利用和线粒体功能的缺陷.
结论:
- DEC1是贝塔细胞代谢成熟和功能的关键昼夜调节器.
- DEC1建立了一个对代谢组织专业化的昼夜编程的层次结构.
- 恢复代谢流量可以拯救由DEC1损失引起的受损的β细胞成熟表型.
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