在牛的心房和心室内原生K通道的可比性质
Sodikdjon A Kodirov1, Tobias Herbinger2, Arndt Rohwedder3
1Department of Cardiology, Medical University Hospital Heidelberg, 69120 Heidelberg, Germany; Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Biophysics, Saint Petersburg University, 199034 Saint Petersburg, Russia; Institute of Biophysics, Johannes Kepler University, Linz, Austria.
概括
牛的心与哺乳动物的心有相似之处,特别是在离子通道功能方面. 这项研究使用了牛心房细胞来建模心脏电生理学,为研究提供了一个更简单的系统.
科学领域:
- 心血管生理学心血管生理学
- 比较电生理学 比较电生理学
- 药理学 药理学是指药理学的学科.
背景情况:
- 软体动物的心脏,特别是牛的心脏,具有双腔结构,心肌细胞与哺乳动物对应物具有相似性.
- 软体动物中的 (Ca), (K) 和 (Na) 离子通道的生物物理学和药理学类似于哺乳动物中的生物物理学和药理学.
- 软体动物中的心室肌细胞和K通道经常被研究,因为它们对特定对抗剂的敏感性.
研究的目的:
- 研究和比较牛Cornu aspersum中心房肌细胞的电生理特性与哺乳动物心脏细胞的电生理特性.
- 评估软体动物心脏作为心脏研究,特别是药理学和毒理学方面的简化实验模型的实用性.
主要方法:
- 从Cornus aspersum中酶分离心房心肌细胞,使用原酶和帕帕因.
- 全细胞补丁技术用于记录离子电流.
- 记录的电流与在相同条件下的老鼠 (Mus musculus) 左心室数据进行比较.
主要成果:
- 牛心房肌细胞中的外向K+电流与牛心室细胞中记录的电流非常相似,无论使用的电压协议如何.
- 牛心房心肌细胞中的电流波形在相同的实验条件下与小鼠左心室的电流波形相似.
- 观察到的差异包括动力学变化和牛心房细胞中内向整流器K通道 (IK1) 激活的缺失.
结论:
- 牛心房心肌细胞的电生理学特性为了解心脏离子通道功能提供了有价值的模型.
- 软体动物的心脏是药理学和毒理学研究的简单和可访问的实验系统.
- 进一步的研究可以利用这些相似之处,在一个更容易管理的模型生物体中探索心脏机制和药物效应.
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