心脏痕组织中的纤维细胞直接调节心脏刺激性和心律失常
Yijie Wang1,2,3,4,5,6, Qihao Li7, Bo Tao1,2,3,4,5,6
1Division of Cardiology, Department of Medicine, University of California Los Angeles, Los Angeles, CA 90095, USA.
Science (New York, N.Y.)
|September 28, 2023
概括
痕组织中的心脏纤维细胞会引发心律失常. 在小鼠中,这些纤维细胞的光遗传刺激引起了广泛的心脏刺激和心律失常,体现了它们的心律失常潜力.
科学领域:
- 心血管生物学
- 心脏电生理学
- 复原医学
背景情况:
- 心脏损伤导致痕组织的形成,主要由纤维细胞组成.
- 纤维细胞可以与心肌细胞 (心肌细胞) 相互作用.
- 这种相互作用表明它在心律失常中可能起作用,但在体内缺乏证据.
研究的目的:
- 在体内研究纤维细胞-肌细胞电的生理相关性.
- 确定痕组织中的心脏纤维细胞是否能诱导心律失常.
- 阐明纤维细胞介导的心脏刺激的机制.
主要方法:
- 只有心脏纤维细胞表达光遗传通道ChR2的基因工程小鼠.
- 诱导心肌梗塞以产生心脏痕组织.
- 对痕组织进行光学刺激,并监测心脏刺激和心律失常.
- 计算机建模以了解合机制.
主要成果:
- 在工程小鼠中对痕组织的光学刺激引起了全器官心脏刺激.
- 在这些动物中观察到诱导性心律失常.
- 已确定隙结合和合是纤维细胞激发肌细胞的机制.
结论:
- 痕组织中的心脏纤维细胞在体内具有生理意义.
- 纤维细胞与肌细胞的合会导致肌细胞激发和心律失常.
- 间隙结合和触觉合的协同和冗余作用有助于这种现象.
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