过度强烈的运动会通过肌肉衍生的线粒体假装者损害认知功能
1Department of Endocrinology, Endocrinology Research Center, Xiangya Hospital of Central South University, Changsha 410008, Hunan, China.
Cell metabolism
|December 4, 2025
概括
过度运动会通过释放肌肉衍生的囊泡,损害大脑线粒体,导致认知能力下降. 阻止这些囊泡可以改善认知功能和突触健康.
科学领域:
- 神经科学是一个神经科学.
- 运动生理学 运动生理学
- 细胞生物学 细胞生物学
背景情况:
- 过度炼可能会对认知功能产生负面影响,精确的生物机制尚未完全理解.
- 在强烈的体力活动中乳酸的积累是已知的代谢副产品.
- 线粒体在细胞能量生产和神经元功能中起着至关重要的作用.
研究的目的:
- 阐明过度运动损害认知功能的机制.
- 为了确定参与运动诱导认知缺陷的特定细胞组件.
- 调查潜在的治疗目标,以减轻过度运动导致的认知障碍.
主要方法:
- 在小鼠模型中研究了肌肉衍生的线粒体衍生的囊泡 (MDVs) 对过度炼的反应的作用.
- 描述了涉及的MDVs (otMDVs) 的特定亚型,分析了它们的分子标记 (mtDNA,PAF) 和迁移行为.
- 利用分子测试来检查otMDVs对海马神经元线粒体运输和突触功能的影响.
- 使用PAF中和抗体阻止otMDV活动,并评估认知和突触结果.
- 在人类研究中,循环中的otMDV水平与认知功能相关.
主要成果:
- 过度运动诱导乳酸积累,促使肌肉分泌具有高mtDNA和PAF的otMDVs.
- 发现otMDVs进入海马神经元,取代内源性线粒体,并触发突触能量缺陷.
- 从otMDVs释放的mtDNA激活了cGAS-STING通路,抑制了基因素家族成员5并阻止了线粒体运输.
- 在otMDVs上的PAF,与合成林一起,阻断了突触线粒体点,进一步损害了能源供应.
- 通过PAF中和抗体阻止otMDV迁移,逆转了突触损失和认知障碍.
- 在人类中,循环中的otMDV水平升高与认知障碍相关.
结论:
- 肌肉衍生的MDVs (otMDVs) 的特定亚群在过度炼后调解认知衰退.
- otMDVs通过移位和受损的运输来破坏海马线粒体功能,导致突触能量危机.
- 针对其他MDV,特别是它们通过PAF的迁移,为运动诱导的认知功能障碍提供了潜在的治疗策略.
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