在患有全身性硬化症的人群中,右心室肌纤维的功能差异与异常性肺动脉高血压相比
Steven Hsu1, Kristen M Kokkonen-Simon2, Jonathan A Kirk3
1Divisions of Cardiology (S.H., K.M.K.-S., M.M., D.A.K.) steven.hsu@jhmi.edu dkass@jhmi.edu.
系统性硬化症相关的肺动脉高血压 (SSc-PAH) 显示了抑郁的瘤功能,与具有增强功能的异常性PAH (IPAH) 不同. 这些肌纤维的差异解释了SSc-PAH患者的结果更差.
科学领域:
- 心脏病学 心脏病学
- 肺部医学 肺部医学
- 细胞生物学 细胞生物学
背景情况:
- 系统性硬化症相关的肺动脉高血压 (SSc-PAH) 的预后比异常性肺动脉高血压 (IPAH) 更差.
- 与IPAH相比,SSc-PAH的右心室 (RV) 收缩和储备受到压抑.
- 肌纤维功能的潜在差异可能解释了这些临床差异.
研究的目的:
- 为了研究SSc-PAH和IPAH之间的肌纤维功能差异.
- 为了将肌细胞功能与体内右心室 (RV) 的表现相关联.
- 探索沙科默功能在SSc-PAH病理生理学中的作用.
主要方法:
- 心脏肌细胞从SSc-PAH,IPAH,SSc与呼吸障碍 (SSc-d) 的患者和对照者的RV隔离.
- 分析了肌细胞的被动长度-张力和活性力-关系.
- 评估了RV隔膜纤维化和体内RV功能,并与肌细胞数据相关联.
主要成果:
- 肌细胞被动度在IPAH和SSc-PAH中都增加.
- 与对照组相比,最大激活力 (Fmax) 在SSc-PAH肌细胞中显著较低 (37%降低),但在IPAH肌细胞中较高 (28%增加).
- 降低SSc-PAH中的Fmax与体内VR收缩性和收缩性储备的降低相关.
结论:
- 萨尔科默功能的主要缺陷导致SSc-PAH中的RV功能障碍.
- 在IPAH中观察到增强的肉瘤功能,与SSc-PAH形成鲜明对比.
- 在SSc中,肉瘤病可能会先于明显的PAH,这表明早期治疗干预的潜力.
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