减轻压力诱导的结构重塑和功能缺陷的iPSC-CMs与PLN R9C突变通过促进自
bioRxiv : the preprint server for biology
|April 25, 2024
概括
在扩张性心肌病 (DCM) 中的PLN R9C突变会导致细胞应激和功能障碍. 激活自部分挽救心脏功能,为这种突变的DCM患者提供潜在的治疗点.
科学领域:
- 心血管生物学 心血管生物学
- 分子心脏病学分子心脏病学
- 干细胞生物学 干细胞生物学
背景情况:
- 胺 (PLN) 通过连接上腺体信号传递和平衡来调节心脏功能.
- 在PLN中R9C突变是已知的早期扩张性心肌病 (DCM) 的原因.
- 人类心肌细胞中PLN R9C诱导的病态重塑的机制仍然不完全理解.
研究的目的:
- 调查PLN R9C突变在DCM病原发生中的作用.
- 确定PLN R9C相关的DCM的潜在治疗目标.
主要方法:
- 产生PLN R9C敲进细胞 (KI) 和患者特异性诱导的多能干细胞干细胞衍生的心肌细胞 (iPSC-CMs).
- 在基底和挑战条件下对细胞表达,收缩功能和信号通路的全面分析.
- 转录组分析和蛋白质稳态,氧化应激和自的评估.
主要成果:
- PLN R9C KI iPSC-CMs对成熟和功能挑战的反应发生了变化,包括瘤失序和处理受损.
- 功能性压力加剧了PLN R9C细胞的缺陷,与蛋白质平衡中断,ROS升高和自流量受损有关.
- 针对患者的iPSC-CM模型证实,功能性压力会恶化PLN R9C相关的心脏缺陷.
结论:
- PLN R9C突变导致处理和收缩性增加,功能挑战放大蛋白质稳定应激和心脏功能障碍.
- 自途径的激活部分改善了PLN R9C心肌细胞中的结构和功能缺陷.
- 针对自是一种有前途的治疗策略,用于携带PLN R9C突变的DCM患者.
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