在心力衰竭中持续性纤维化与减少的射出分数,与人类心脏纤维细胞群体的表型差异有关
Rachel M Biggs1, Yuhua Zhang1, Daniel N Silverman1,2
1Division of Cardiology, Department of Medicine Medical University of South Carolina Charleston SC USA.
Journal of the American Heart Association
|April 10, 2025
概括
左心室辅助装置 (LVAD) 治疗心力衰竭并不能减少心肌纤维化或心脏硬. 患有心力衰竭的患者的纤维细胞保持活化和硬,即使在LVAD支持后.
科学领域:
- 心脏病学 心脏病学
- 生物医学工程 生物医学工程
- 翻译医学是一种翻译医学.
背景情况:
- 心肌纤维化是心肌病的常见特征,导致心力衰竭,减少排气分数.
- 左心室辅助器械 (LVAD) 治疗减轻了心脏的负荷,但在以前的研究中并没有持续减少纤维化.
- 这项研究调查了持续性纤维化和纤维细胞激活,尽管LVAD治疗.
研究的目的:
- 测试LVAD植入后纤维化和纤维细胞激活是否持续,导致持续的心肌硬.
- 了解纤维细胞机械敏感性在心力衰竭和LVAD支持的背景下发挥的作用.
主要方法:
- 从心力衰竭患者收集的心肌组织,LVAD前,LVAD后和对照.
- 量化了心肌硬度,原蛋白含量和纤维细胞群.
- 隔离了纤维细胞,并评估了它们对不同基质刚性的反应,通过批量RNA测序分析基因表达.
主要成果:
- 与对照组相比,LVAD前后的心脏表现出心肌硬度和原含量增加.
- 在LVAD前和后的心脏中,纤维细胞群的数量增加.
- 虽然对照纤维细胞适应了基质刚性,但LVAD前和后的纤维细胞没有,在机械敏感通道中显示了基因表达的改变.
结论:
- 持续的血液动力过载会导致纤维细胞的表型变化,减少它们感知机械输入的能力.
- 这种纤维细胞重编程有助于持续的原沉积和心肌硬,即使在LVAD支持后.
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