与肺高血压相关的右心室心肌细胞重塑降低了特雷布罗斯尼尔的功能
Aleksandra Judina1, Marili Niglas1, Vladislav Leonov1,2
1Cardiac Section, National Heart and Lung Institute (NHLI), Faculty of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, UK.
肺高血压通过改变RV心肌细胞导致右心室 (RV) 衰竭. 在这项研究中,prostinil和异上腺素联合治疗没有改善RV功能.
科学领域:
- 心血管生物学 心血管生物学
- 肺高血压的病理生理学
- 细胞药理学细胞药理学
背景情况:
- 与肺高血压 (PH) 相关的右心室 (RV) 衰竭是一种与减少的肺血管扩张器相关的关键并发症.
- 特雷普罗斯提尼尔在患有心脏衰竭的PAH患者中显示出有前途的结果,这表明潜在的心脏益处.
- 假设心肌细胞的RV结构变化会损害收缩反应和cAMP/PKA信号传递.
研究的目的:
- 在PH的老鼠模型中,研究特雷普罗斯尼和异二甲在RV和LV心肌细胞上的协同作用.
- 确定VR心肌细胞中与疾病相关的结构变化是否会降低收缩反应和cAMP/PKA信号活动.
- 评估联合特雷普罗斯尼尔和异上腺素在PH诱导的RV功能障碍中的治疗潜力.
主要方法:
- 在使用单克罗他林的老鼠中诱导了PH;室腔心肌细胞被分离出来.
- 在体外刺激中,使用特雷普罗斯尼尔和异上腺素评估了心肌细胞收缩.
- 通过FRET显微镜评估了生物传感器表达细胞中的PKA活性,以应对特雷沙.
主要成果:
- PH RV心肌细胞表现出不适应的重塑,包括缩和受损的收缩性和过渡性.
- 结合特雷普罗斯尼尔和异上腺素未能增强PH RV心肌细胞的内性或纠正异常收缩行为.
- 在PH RV心肌细胞中,用列素治疗导致PKA活性降低.
结论:
- 与PH相关的RV心肌细胞重塑降低了特雷普罗斯尼尔的敏感性,无otropic支持,并损害了放松.
- 晚期PH中RV功能障碍的复杂性需要探索替代治疗策略.
- 目前的组合疗法可能无法有效地纠正先进的PH诱导的RV心肌细胞功能障碍.
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