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Regulation of sarcoplasmic reticulum Ca2+ content depletion on cardiac Ca2+release
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 16
- DOI:
- 10.3321/j.issn:1000-2790.2005.16.001
- Key Word:
- 钙释放;显微镜检查;共焦;肌浆网;心肌/细胞学
Abstract： 目的:较系统地研究肌浆网(SR)内钙容量的减少对心肌细胞钙释放的影响.方法:采用肌浆网膜的钙泵抑制剂thapsigargin(TG)耗减SR内钙容量,以喷咖啡因的方法估测SR内钙容量,以局部场刺激的方法诱发全细胞的钙释放.胞内钙信号的变化均采用激光共聚焦显微镜的方法记录.结果:SR钙泵抑制剂TG以剂量依赖和非线性的时间依赖方式引致心肌细胞SR内钙容量的耗减,而钙容量的耗减可相应地引起全细胞水平的钙释放减少.但二者的变化不完全平行,SR内钙容量的少量减少即可引起胞内钙释放的显著减少,而当SR内钙耗减到一定程度后(虽然此时SR内Ca2+仍远高于胞质内钙),场刺激已很难或无法引致钙释放.结论:心肌细胞SR内钙容量对胞内钙释放具有重要的非线性调节作用.
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