控制生理性葡萄糖恒常度通过基质基质可用性的下丘脑调节
Abdullah Hashsham1, Nandan Kodur1, Jiaao Su1,2
1Department of Internal Medicine, University of Michigan, Ann Arbor, MI.
bioRxiv : the preprint server for biology
|June 3, 2024
概括
在禁食期间,大脑神经元通过激活脂肪分解来控制血糖. 这项研究确定了中腹下丘脑核 (VMN) CCKBR神经元作为通过交感神经系统调节葡萄糖平衡的关键调节者.
科学领域:
- 神经科学是一个神经科学.
- 内分泌学 在内分泌学.
- 代谢过程中的代谢.
背景情况:
- 大脑在禁食期间调节葡萄糖产生的作用尚未完全理解.
- 现有的知识缺乏有关在禁食期间参与维持血糖水平的特定神经回路的细节.
研究的目的:
- 阐明大脑在禁食期间增加葡萄糖生产的机制.
- 为了确定在下丘脑中调节葡萄糖平衡的特定神经元群体.
- 研究交感神经系统在调解这些影响中的作用.
主要方法:
- 利用基因操纵来使腹中中枢下丘脑核 (VMN) 中的特定神经元 (CckbrTetTox动物) 沉默.
- 测量血糖水平,脂溶和循环基质度 (例如甘油).
- 评估胰岛素,逆调节性激素,肝糖原和肝糖原基因表达.
- 使用β3-上腺素激动剂刺激脂肪组织.
主要成果:
- 发现VMNCckbr神经元可以在禁食期间预防低血糖症.
- 这些神经元的激活动员了葡萄糖原蛋白基质,而不会影响葡萄糖分解或肝脏葡萄糖原蛋白基因表达.
- 沉默VMNCckbr神经元降低了禁食血糖和受损的脂解,降低了循环中的糖醇.
- 脂肪组织刺激恢复了沉默动物的脂解和血糖,表明了依赖于交感神经系统的机制.
结论:
- VMNCckbr神经元通过调动葡萄糖基质来调节血糖,而不是通过控制小岛或肝脏生理.
- 脑下垂体和交感神经系统 (SNS) 信号传递在禁食期间的正常葡萄糖平衡中起着至关重要的作用.
- 葡萄糖生成基质的调动是维持生理性禁食期间葡萄糖水平的关键过程.
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