27 - 基胆固醇通过线粒体功能障碍抑制肌肉细胞活力:ROS诱导的HIF-1α的保护作用
Bakhovuddin Azamov1, Wan-Seog Shim1, Chanhee Lee1
1Department of Convergence Medicine, Pusan National University School of Medicine, Yangsan 50612, Republic of Korea.
Free radical biology & medicine
|March 15, 2026
概括
氧化胆固醇27-胆固醇 (27OHC) 通过促进细胞死亡和阻碍肌肉分化,损害了骨肌肉的活力和功能. 抑制27OHC可以治疗与年龄相关的肌肉缩和肉症.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 肌肉生理学 肌肉生理学
背景情况:
- 氧化胆固醇27-胆固醇 (27OHC) 涉及到各种病理,但其在肌肉病理生理学,特别是肉症中的作用尚不清楚.
- 肉症和肌肉缩是与年龄相关的疾病,严重影响健康和运动能力.
研究的目的:
- 研究27OHC对骨肌肉活力,细胞通路和体内肌肉功能的影响.
- 探索针对27OHC治疗干预治疗与年龄相关的肌肉损失的潜力.
主要方法:
- 利用了27OHC治疗的肌细胞细胞培养,随后进行RNA测序和对亡和线粒体通路的分析.
- 评估了活性氧物种 (ROS) 生成,线粒体膜潜力和与肌肉分化相关的基因表达.
- 在小鼠体内评估的 in vivo 效果,包括运动耐力,肌肉形态和27OHC后的损伤恢复.
主要成果:
- 27OHC通过激活亲细胞亡途径和诱导ROS降低了肌肉细胞活力,导致线粒体功能障碍.
- RNA测序揭示了缺氧诱导因子1-alpha (HIF-1α) 反应基因的显著上调和关键肌肉分化和PI3K信号传递路径的下调.
- 在小鼠中27OHC治疗导致运动能力降低,肌肉大小缩小,肌肉再生受损,与老年人血27OHC水平增加相关.
结论:
- 27OHC直接损害骨肌细胞,通过亡和分化失调导致肌肉缩和肉衰竭.
- HIF-1α激活和线粒体功能障碍是27OHC诱导的肌肉损伤的关键机制.
- 药理上抑制27OHC产生是一种潜在的治疗策略,可以对抗与年龄相关的肌肉衰退.
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