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在RyR2-咖啡因结合部位的功能丧失W4645R突变:对同步和心律失常产生影响

José-Carlos Fernández-Morales¹, Noemi Toth¹, Pinar Bayram¹

¹Cardiac Signaling Center of MUSC, USC and Clemson University, Charleston, SC, USA.

|June 22, 2024

概括

RyR2中的W4645R突变破坏了咖啡因结合,导致的释放受损,心脏细胞的泄漏增加. 这种功能障碍与心律失常和心脏功能降低有关.

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
信号传递信号传递

背景情况:

位于咖啡因结合部位的RyR2 W4645R突变与catecholaminergic多态心室性心跳动 (CPVT1) 有关.
假设托残留物W4645通过影响咖啡因结合部位和炭基终端域之间的相互作用来调节RyR2 Ca2+敏感性.

研究的目的:

研究RyR2 Ca2+结合的调节作用及其与咖啡因结合部位的相互作用.
在人类诱导的多能干细胞干细胞衍生心肌细胞 (hiPSCCMs) 中描述W4645R-RyR2突变的Ca2+信号表型.

主要方法:

使用CRISPR/Cas9基因编辑,在hiPSCCM中引入W4645R-RyR2点突变.
在WT和W4645R-RyR2 hiPSCCMs之间的Ca2+信号表型的比较.

主要成果:

W4645R-RyR2心肌细胞表现出正常的I_Ca,但减少了Ca²⁺诱导的Ca²⁺释放 (CICR) 和改变了Ca²⁺的短暂动力学.
由于增强的SR Ca2+泄漏,观察到咖啡因触发的Ca2+释放完全丧失,SR Ca2+含量减少40%.
这种突变导致火花和异步自发SR Ca2+释放的发生率较低.

结论:

W4645R-RyR2突变导致咖啡因入的Ca2+释放的丧失和SR Ca2+泄漏的增加.
这些变化导致异步自发的Ca2+释放,这可能引发心律失常并损害心脏功能.

关键词:

在CPVT1中使用.咖啡因结合的部位克里斯普尔/卡斯9 瑞诺丁受体突变瑞诺丁受体突变人类诱导的多能干细胞

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