胰岛素缺乏会触发脂肪组织热生成和减肥
Aileen H Lee1,2,3, Lucie Orliaguet1,2,3, Yun-Hee Youm1,2,3
1Department of Pathology, Yale School of Medicine, New Haven, CT, USA.
Nature metabolism
|June 3, 2025
概括
通过激活交感神经系统,饮食中氨酸的限制会触发脂肪组织的色化和小鼠的显著体重减轻. 恢复氨酸水平可以防止这些影响,强调氨酸在新陈代谢中的重要作用.
科学领域:
- 代谢研究的研究.
- 营养科学 营养科学
- 内分泌学 在内分泌学.
背景情况:
- 卡路里限制 (CR) 和氨酸限制 (MR) 可以延长寿命和健康期.
- 这些饮食干预措施促进白色脂肪组织 (WAT) 的"棕色化",增加热生成.
- 特定的饮食氨基酸在控制脂肪热生成中的作用尚不清楚.
研究的目的:
- 研究特定的食氨基酸,特别是氨酸在调节脂肪组织热生成和新陈代谢中的作用.
- 阐明氨酸对体重调节和代谢健康的影响背后的机制.
主要方法:
- 在CR之后,人类WAT中氨酸水平的分析.
- 在小鼠中诱导全身氨酸枯竭以观察代谢效应.
- 研究交感神经系统 (SNS),上腺素和β3-上腺素受体在氨酸耗尽诱导作用中的作用.
- 评估氨酸缺乏对肥胖小鼠能量消耗,体重减轻和代谢炎症的影响.
主要成果:
- 人类的CR导致WAT中囊蛋白水平降低.
- 在小鼠中,全身氨酸枯竭导致致命的体重减轻,脂肪利用率增加和WAT棕色化.
- 这些效应通过饮食中氨酸恢复而得到挽救.
- 由氨酸限制引起的WAT棕色化和体重减轻取决于通过β3-上腺体受体传递SNS信号,独立于FGF21和UCP1.1.
- 肥胖小鼠的囊缺乏导致了快速的WAT棕色化,显著的体重减轻 (30%) 和逆转代谢炎症.
结论:
- 氨酸对于生物体的新陈代谢至关重要.
- 囊素的减少会触发脂肪组织的色化和显著的体重减轻.
- 这突出了一个新的机制,它将特定的氨基酸与代谢调节和能量消耗联系起来.
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