衰老的肌表现出变化的应变依赖细胞外矩阵重塑机制
Anthony N Aggouras1,2, Emma J Stowe1, Samuel J Mlawer1,2
1Department of Biomedical Engineering, Boston University, 44 Cummington Mall, Boston, MA 02115.
Journal of biomechanical engineering
|April 8, 2024
概括
衰老会影响肌适应机械负荷. 与年轻肌相比,老化的肌显示出较低的重塑反应,影响老年人的组织平衡和受伤风险.
科学领域:
- 生物医学工程 生物医学工程
- 肌肉骨生物学 肌肉骨生物学
- 衰老研究研究 衰老研究
背景情况:
- 衰老是退行性肌损伤的主要危险因素.
- 与年龄相关的肌退化和对机械负荷的反应背后的细胞机制仍然不清楚.
- 老化的肌具有固有的细胞差异,影响它们维持机械组织平衡的能力.
研究的目的:
- 为了研究年轻和年长的小鼠曲肌探体对不同程度的体外拉伸应变的重塑反应.
- 为了确定老化的肌是否与年轻肌相比,对机械负荷的适应性反应减弱.
- 为了确定最佳的机械负荷条件,以研究肌重塑 in vitro.
主要方法:
- 静态和周期性应变对年轻肌矩阵重塑的影响的比较.
- 在7天的时间内,对年轻和年长的肌突破者施加多种循环拉伸性应变 (0-7%).
- 评估组织组成,生物合成能力和降解特征,以评估重塑.
主要成果:
- 周期性菌株被发现是研究肌改造的最佳方法.
- 1%循环菌株有效地维持了原生生理学,并促进了年轻肌和老肌的细胞外基质 (ECM) 周转.
- 老化的肌显著减少了依赖应变的变化,这表明适应改变的机械刺激的能力降低了.
结论:
- 老化的肌在应对机械负荷变化的情况下,表现出适应其重塑过程的能力减弱.
- 这些发现突出了肌机械生物学和组织平衡的与年龄相关的变化.
- 了解这些与年龄相关的差异对于开发有效的临床康复策略至关重要 老年肌损伤患者.
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