食物感知促进MFFS131的化和肝脏中的线粒体碎片化
Sinika Henschke1,2,3, Hendrik Nolte3,4, Judith Magoley1,2,3
1Max Planck Institute for Metabolism Research, Department of Neuronal Control of Metabolism, Cologne, Germany.
概括
感官食物感知触发肝脏线粒体碎片化通过AKT依赖的MFF酸化,适应肝脏的葡萄糖代谢. 这种下丘脑-肝轴反应为预期的营养变化做好了准备.
科学领域:
- 代谢调节
- 线粒体动力学
- 神经内分泌学
背景情况:
- 肝脏线粒体对于新陈代谢适应营养的可用性至关重要.
- 通过预期的营养变化对肝脏线粒体动态的调节尚不清楚.
研究的目的:
- 调查肝脏线粒体动态的快速调节,以应对预期的营养物质可用性.
- 阐明将感官食物感知与肝脏线粒体功能联系在一起的分子机制.
主要方法:
- 使用了体外和体内模型,包括带有突变线粒体裂变因子 (MFF) 的试验小鼠模型.
- 在血清131 (MFFS131) 中研究了MFF的蛋白质激酶B/AKT (AKT) 依赖酸化.
- 检查了下丘脑中表达前黑色素 (POMC) 的神经元的作用.
主要成果:
- 通过依赖AKT的MFFS131酸化诱导了快速的肝细胞分裂.
- 下丘脑POMC神经元的激活促成了这种反应.
- 在小鼠中,一种非酸化的MFFS131G突变阻止了线粒体碎片化,改变了肝脏线粒体动态.
- 在MFFS131G试验小鼠中,胰岛素刺激的肝脏葡萄糖的抑制受损.
结论:
- 一个下丘脑-肝脏轴迅速适应肝脏线粒体功能预期的营养状态.
- 这种适应对于控制肝脏葡萄糖代谢至关重要.
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