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在实验室和in silico的本体遗传发育过程中,对老鼠鼻节真心脏起器细胞的动作潜能形态变化的分析

Alexander Ryvkin¹, Arseniy Furman², Elena Lebedeva²

¹Ben Gurion University of Negev, Beer Sheva, Israel.

Developmental dynamics : an official publication of the American Association of Anatomists

|March 9, 2024

概括

由于发育过程中节拍器细胞功能的变化,老鼠的心率在成熟期间会增加. 这项研究阐明了驱动这些关键的产前后心率变化的潜在离子机制.

科学领域:

心血管生理学心血管生理学
发展生物学发展生物学
计算生物学计算生物学

背景情况:

随着老鼠的成熟,心率自然会增加.
驱动这种发育性心率变化的精确机制尚未完全理解.
研究这些机制对于理解心脏发育至关重要.

研究的目的:

阐明小鼠产前后发育过程中心率变化背后的机制.
分析动作潜能记录,并执行中节节拍细胞的in silico建模.

主要方法:

从小鼠鼻腔节点 (SAN) 心脏起器细胞在各种发育阶段 (E12.5到成年) 的动作潜能记录.
使用 ivabradine,Ni2+ 和 nifedipine 评估离子电流贡献的药理干预.
在电脑模拟中,模拟离子电流密度和细胞内动态.

主要成果:

动作潜力的配置保持相似,但周期长度和动作潜力的持续时间随着发展而减少.
最大透析电位 (MDP) 和作用电位振幅下降,而透析脱极化速度 (DDR) 增加.
药理学数据表明,对伊瓦布拉丁,Ni2+和尼菲迪平的敏感性在发育过程中发生了变化,这表明离子通道功能发生了变化.
计算机模拟显示,在发育过程中,高极化激活的节拍器电流 (If) 密度下降,电流增加.

结论:

在I_K1密度的发育性下降有助于MDP脱极化.
这种脱极化促进了电流的激活,将心脏起器机制从"膜时钟"转变为"时钟"主导.
这些离子重塑事件解释了在老鼠成熟期间观察到的心率的增加.

关键词:

行动潜力行动潜力行动潜力电生理学属性电生理学属性离子机制离子机制人类的本体发生.鼻腔结节细胞的细胞结节.

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