胸膜相互作用分子1在心脏缩中的关键作用
Circulation
|August 4, 2011
概括
电流相互作用分子1 (STIM1) 通过控制心肌细胞中的特定电流来驱动心脏缩. 沉默STIM1可以在体内防止压力过载引起的心脏缩.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 细胞生理学 细胞生理学
背景情况:
- 心肌细胞利用 (Ca2+) 进行激发-收缩合和信号通路,包括心脏缩.
- 在心肌细胞的快速波动期间,Ca2+触发信号的确切机制尚不清楚.
- 存储运行的Ca2+输入,依赖于树皮相互作用分子1 (STIM1),是潜在的Ca2+信号通路.
研究的目的:
- 为了研究STIM1依赖的Ca2+存储在心肌细胞缩中的作用.
- 为了确定STIM1是否有助于心脏缩在体外和体内.
主要方法:
- 在新生儿和成年大鼠心肌细胞中检查了可诱导药物存储的Ca2+输入.
- 评估了来自对照和过度缩的心脏的心肌细胞中的STIM1表达和功能.
- 通过基因操纵研究了STIM1对心肌细胞缩的必要性和充分性.
- 在压力过载的老鼠模型中,利用腺相关病毒血清型9进行STIM1沉默.
主要成果:
- STIM1通过药物诱导的储存运行的Ca2+进入心肌细胞.
- STIM1依赖的Ca2+输入和向内纠正的电流在缩性心肌细胞中显著增加.
- 发现STIM1对于心肌细胞增大既足够又必要.
- STIM1沉默保护大鼠免受压力过载引起的心脏缩.
结论:
- 在促进心脏缩方面,STIM1起着至关重要的作用.
- STIM1控制了一种以前未被识别的状体电流,该电流有助于心脏缩.
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