在HRAS-突变性心肌细胞模型的多聚焦性心房动脉动
Nelson A Rodríguez1, Nihir Patel1, Rafael Dariolli2
1Mindich Child Health & Development Institute (N.A.R., N.P., S.N., A.G.A., M.R., B.D.G.), Icahn School of Medicine at Mount Sinai, New York, NY.
Circulation. Arrhythmia and electrophysiology
|February 28, 2024
概括
在Costello综合征中,功能获取HRAS突变通过增加细胞自动性导致心律问题. 这项研究使用干细胞揭示HRAS.
科学领域:
- 心血管生物学 心血管生物学
- 遗传学 遗传学 是一个
- 干细胞生物学 干细胞生物学
背景情况:
- 科斯特罗综合征 (CS) 是由生殖线HRAS功能增益变体引起的.
- 多焦点心房动心 (MAT) 是一种耐治疗的动脉节律失常症,在幼儿时代影响了50%的CS患者.
- 在CS中MAT的发病原因尚不清楚.
研究的目的:
- 研究如何过度活跃的HRAS信号触发心房状心肌细胞 (ACM) 的心律失常.
- 建立人类诱导的多能干细胞 (hiPSC) 模型,用于研究CS中MAT.
主要方法:
- 从具有HRAS Gly12突变的CS患者生成的hiPSC-ACM.
- 通过自动贴片紧,评估电生理学特性 (动作潜力,瞬态,奇怪电流).
- 对差异性基因表达和基因本体学的转录数据进行分析.
- 通过免疫阻塞评估蛋白质表达.
主要成果:
- HRAS变异ACM表现出更高的跳动率和增加的像起器的细胞群体,增加了可笑的电流密度.
- 特定抑制剂 (伊瓦布拉丁,弗莱卡尼德,维拉帕米尔) 调节了殴打率和不规则性.
- 突变的ACM显示了与心率,平衡和节点编程有关的高调基因表达.
- 在突变的ACM中,MAPK活性被抑制.
结论:
- 在hiPSC衍生的ACM中,功能获取HRAS突变诱导了转录性变化,促进了增强的自动性和心律失常.
- 这种hiPSC模型阐明了Costello综合征中多焦点心房低心率的机制基础.
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