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雌激素通过抑制骨质细胞中NAD代谢来保护骨质
Adriana Marques-Carvalho1, Gareeballah Osman Adam1, Ankita Chalke1
1Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA.
bioRxiv : the preprint server for biology
|August 12, 2025
概括
雌激素通过抑制骨质前体前体中的NAD+水平和SIRT3活性来预防骨质损失. 抑制这些途径可以模仿雌激素的作用.
科学领域:
- 内分泌学 在内分泌学.
- 骨生物学 骨生物学 骨生物学
- 线粒体的新陈代谢
背景情况:
- 雌激素通过抑制骨质细胞活性来保护骨.
- 雌激素降低了骨质细胞前体中的线粒体复合体I活性.
- NAD+和SIRT3参与细胞代谢和氧化还原平衡.
研究的目的:
- 研究NAD+和SIRT3在雌激素对骨的保护作用中的作用.
- 为了确定NAD+和SIRT3是否调解雌激素抑制骨质细胞形成.
主要方法:
- 在小鼠和人类骨质细胞前体中测量NAD+水平和SIRT3活性.
- 在体外操纵NAD+水平和SIRT3活性.
- 在体内和体外使用基因删除模型 (Nampt,Sirt3).
- 在卵巢切除的小鼠中评估骨损失.
主要成果:
- 兰克增加了NAD+和SIRT3;17β-雌二醇 (E2) 在骨质细胞前体中抑制了它们.
- 增加的NAD+或NAD+/NADH比率逆转了E2对SIRT3和骨质细胞形成的抑制.
- 在卵巢切除的小鼠中,Nampt删除降低了NAD+并防止了骨损失.
- 在骨质细胞前体中Sirt3删除减轻了雌激素缺乏后的骨再吸收.
结论:
- 雌激素的抗吸收作用包括抑制NAD+水平和线粒体的氧化还原代谢.
- 雌激素抑制SIRT3有助于它们的骨保护作用.
- 准NAD+代谢可能为治疗骨损失提供新的策略.
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