在缺血性人类心脏病中,提丁异型开关是人体缺血性心脏病
Ciprian Neagoe1, Michael Kulke, Federica del Monte
1Institute of Physiology and Pathophysiology, University of Heidelberg, Germany.
Circulation
|September 11, 2002
概括
人类心脏中的慢性缺血会导致提丁异型转移,减少肌纤维细胞硬性,并可能损害弗兰克-斯塔林机制. 这种转变也在肌动脉梗塞后的老鼠心脏中观察到.
科学领域:
- 心血管生物学 心血管生物学
- 肌肉生理学 肌肉生理学
- 进行心脏重塑.
背景情况:
- 缺血引起的心肌病症增加了肌动脉硬度,这是由于原和titin.
- 人类心脏表达N2BA (符合) 和N2B (刚性) 提丁异型,而老鼠心脏主要表达N2B.
- 研究了提丁在缺血引起的左心室硬化中的作用.
研究的目的:
- 为了研究蒂异型在缺血引起的左心室硬化中的作用.
- 为了确定冠状动脉疾病 (CAD) 的人类心脏和心肌梗塞的老鼠模型中的蒂异形比率.
- 评估蒂异形变化对肌纤维细胞硬性的影响.
主要方法:
- 凝电泳和免疫阻塞用于分析提丁异型比率 (N2BA:N2B).
- 免疫光显微镜检查滴的排列,原蛋白和desmin的表达.
- 对孤立的肌纤维细胞进行力测量,以确定被动张力.
主要成果:
- 与非缺血性心脏移植 (32:68) 相比,CAD心脏移植显示了较高的N2BA:N2B滴度比率 (47:53).
- 正常和CAD捐赠心脏具有~30%的N2BA滴定;CAD心脏表现出滴定修饰和原增加/减少.
- 缺血性老鼠心脏与假操作的老鼠 (14%),相比,产生了明显的N2BA滴滴带 (43%).
- 从高端透压心脏的CAD心脏的肌纤维细胞中观察到被动紧张的减少.
结论:
- 在慢性缺血性人类心脏中发生了一种提丁异型开关,有利于符合N2BA异型.
- 这种转变,也在缺血性老鼠心脏中观察到,减少了来自titin的肌纤维细胞硬.
- 缺血性心肌中的提丁修饰可能会损害心脏利用弗兰克-斯塔林机制的能力.
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