线粒体隔离的Aβ使得老年人有患阿尔茨海默病风险的突触线粒体易受伤害
Kun Jia1, Jing Tian1, Tienju Wang1
1Department of Pharmacology and Toxicology, University of Kansas, Lawrence, Kansas, USA.
JCI insight
|November 22, 2023
概括
老龄化和阿尔茨海默病 (AD) 中的线粒体功能障碍与大脑细胞线粒体内的粉样β 42 (Aβ42) 积累有关. 这种线粒体内Aβ42损害了突触能量的产生,表明从正常衰老到AD的持续过渡.
科学领域:
- 神经科学是一个神经科学.
- 线粒体生物学 线粒体生物学
- 衰老研究研究 衰老研究
背景情况:
- 线粒体功能障碍是大脑衰老和阿尔茨海默病 (AD) 的标志.
- 老龄化中的线粒体功能障碍与AD之间的机械联系仍在争论中.
- 突触线粒体对神经元功能至关重要,容易受到侮辱.
研究的目的:
- 调查线粒体内粉样β 42 (Aβ42) 和突触线粒体生物能效低下之间的关系.
- 为了确定老化和早期AD阶段的线粒体功能障碍是否有机械联系.
- 探索线粒体内Aβ42隔离在从正常衰老过渡到AD中的作用.
主要方法:
- 在衰老和轻度认知障碍中对内突触体Aβ42和突触线粒体生物能学的相关性分析.
- 利用人性化的Aβ-knockin (hAβ-KI) 鼠标模型来研究线粒体内Aβ42.
- 评估了线粒体内的Aβ42封存及其对年龄大的Aβ-KI小鼠微细胞灭菌的抵抗力.
主要成果:
- 在衰老和轻度认知障碍中发现了内突突体Aβ42与突触线粒体生物能学受损之间的相关性.
- 在Haβ-KI小鼠中,肌内线粒体内Aβ42封存的增加与突发的突触线粒体功能障碍有关.
- 与老年小鼠的全球Aβ相比,线粒体内Aβ42相对受到微质清除的保护.
结论:
- 与衰老相关的线粒体Aβ42隔离有助于突触线粒体功能障碍在从正常衰老过渡到AD.
- 老龄化和预发性AD中的线粒体功能障碍可能代表由神经内Aβ积累驱动的连续性.
- 线粒体在早期的粉样化症中起着关键作用,在从正常到病态的大脑衰老的进展过程中.
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