在雄性小鼠中,急性线粒体反应性氧物种的排放导致创伤性肌肉损伤后的线粒体功能障碍
Junwon Heo1,2, David L Miller2, Jessica R Hoffman1
1Department of Physiology & Pharmacology, University of Georgia, Athens, Georgia, United States.
American journal of physiology. Cell physiology
|June 4, 2025
概括
大量的肌肉损失 (VML) 导致线粒体功能障碍和软弱. 一种,SS-31,减少了有害的ROS排放并提高了线粒体效率,但在康复过程中并没有完全恢复肌肉收缩功能.
科学领域:
- 肌肉生理学和生物能量学
- 线粒体医学是指线粒体医学.
- 再生医学是一种再生医学.
背景情况:
- 体积肌肉损失 (VML) 会导致显著的肌肉衰弱,线粒体功能受损,恢复有限.
- 在VML中线粒体功能障碍的特点是超极化膜潜力和过度反应性氧物种 (ROS) 生产.
- 了解急性ROS排放的作用对于开发有效的VML治疗至关重要.
研究的目的:
- 调查急性ROS排放在VML诱导的线粒体功能障碍中的作用.
- 为了评估SS-31的治疗潜力,一个线粒体向性,在减弱ROS和改善VML后线粒体功能.
- 评估SS-31和再生康复对VML后肌肉适应的综合影响.
主要方法:
- 在VML受伤的小鼠模型中建立了ROS排放和抗氧化剂缓冲能力 (AoxBC) 的时间过程.
- 管理SS-31并评估其对线粒体生物能学和来自特定电子运输链复合体的ROS产生的影响.
- 结合SS-31与轮子运行康复,并分析了收缩和代谢适应,以及脂质和蛋白质变化.
主要成果:
- 在受伤后的最初14天内,VML损伤导致ROS排放增加和AoxBC减少,与线粒体生物能学受损相关.
- 电子输送链复合体I,II和III被确定为主要ROS来源.
- SS-31治疗减弱了ROS,增强了线粒体呼吸导电性和效率,并调节了氧化还原蛋白的丰度.
- 结合SS-31和康复治疗显示了适度的代谢改善,但与单独康复治疗相比,收缩功能没有显著改善.
结论:
- 急性ROS排放在VML诱导的线粒体功能障碍中起着重要作用.
- SS-31有效地减轻氧化应激,并改善VML损伤后的线粒体生物能.
- 虽然SS-31提供了好处,但仅仅它就不足以完全恢复收缩功能,这表明氧化应激不是VML相关缺陷的唯一驱动因素,并表明需要多方面的治疗策略.
相关概念视频
Muscle Recovery and Fatigue
2.6K
Muscle fatigue refers to the decline in a muscle's ability to maintain the force of contraction after prolonged activity. It primarily stems from changes within muscle fibers. Even before experiencing muscle fatigue, one may feel tired and have the urge to stop the activity. This response, known as central fatigue, occurs due to changes in the central nervous system, namely the brain and spinal cord. While there is no single mechanism that induces fatigue, it may serve as a protective...
2.6K
Mitochondrial Membranes
12.5K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
12.5K
Electron Transport Chain: Complex I and II
15.1K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
15.1K


