温度和pH值的组合变化模仿运动导致肌肉线粒体效率下降
Mathias Flensted-Jensen1, Ann-Sofie Kleis-Olsen1, Rasmus Kinimond Hassø1
1Xlab, Center for Healthy Aging, Department of Biomedical Sciences, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark.
Journal of applied physiology (Bethesda, Md. : 1985)
|November 16, 2023
概括
运动引起的温度和pH值变化会损害线粒体效率,这可能解释了乳酸值以上运动能力的降低. 这项研究在小鼠骨肌线粒体中研究了这些效应.
科学领域:
- 运动生理学 运动生理学
- 线粒体生物学 线粒体生物学
- 骨肌肉的新陈代谢
背景情况:
- 运动效率在乳酸值以上下降,但根本原因尚不清楚.
- 线粒体功能障碍是一种拟议的,但难以验证的,体内机制.
- 运动期间肌肉内条件发生变化,影响细胞功能.
研究的目的:
- 研究模仿运动的温度和pH值变化对骨肌肉线粒体效率的影响.
- 在改变的生理条件下评估氧化酸化能力和P/O比率.
- 为了区分单独的线粒体与透的肌肉纤维之间的影响.
主要方法:
- 使用了20只野生类型小鼠的四头肌肉.
- 孤立的线粒体和透的肌肉纤维.
- 在不同温度 (37°C与40°C) 和pH (7.4与6.8) 条件下,使用高分辨率呼吸计评估氧化酸化和P/O比率.
主要成果:
- 温度升高和pH值降低相结合,显著降低了分离线粒体中的P/O比率.
- 泄漏呼吸增加,呼吸控制比率 (RCR) 在孤立线粒体的联合压力下下降.
- 透纤维的效果不太明显,只有温度对RCR和泄漏产生主要影响.
结论:
- 像运动一样的温度升高和pH值降低的条件会损害线粒体效率.
- 这些发现支持了线粒体效率降低的假设,这有助于在更高的强度下降运动能力.
- 对理解运动生理学和评估运动期间线粒体功能的影响.
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