机械压力触发心脏纤维细胞中过早衰老
Stephanie E Schneider1,2, Adrienne K Scott1,2, Katie M Gallagher1,2
1Paul M. Rady Department of Mechanical Engineering, University of Colorado Boulder, Boulder, CO, 80309, USA.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|September 26, 2025
概括
改变的机械信号,如减少拉伸和增加频率,单独可以诱导心脏纤维细胞衰老. 这种过早衰老涉及核膜蛋白质损失和p53/p21通路.
科学领域:
- 心血管生物学 心血管生物学
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 心血管系统经常受到机械拉伸的影响.
- 机械和生化信号的破坏有助于心血管疾病.
- 在心血管疾病中观察到心脏纤维细胞 (CF) 激活和衰老,但仅仅机械刺激的作用尚不清楚.
研究的目的:
- 为了调查单纯的机械刺激是否能在初级小鼠心脏纤维细胞中诱导衰老表型.
- 为了确定触发衰老的特定机械参数.
- 阐明了机械诱导衰老背后的分子机制.
主要方法:
- 主要的小鼠心脏纤维细胞经历了带有各种机械参数的单轴拉伸.
- 通过细胞循环停止,B层表达和DNA损伤等标记来评估衰老.
- 研究了特定分子通路 (p53/p21,p16) 和核包膜蛋白埃梅林的参与.
主要成果:
- 减少拉伸幅度和增加频率,模仿病理状况,诱导了CF患者的衰老表型.
- 机械诱导的衰老依赖于p53/p21通路.
- 过早衰老与核包膜蛋白埃梅林水平的降低有关,这表明核完整性受到损害.
结论:
- 改变的机械信号足以触发过早的心脏纤维细胞衰老.
- 核完整性受到损害,以减少的埃梅林为标志,这与机械诱导衰老的机制有关.
- 这项研究强调了机械力量对心血管系统细胞衰老的直接影响.
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