德克斯梅德托米丁在人类心脏中的收缩作用
Joachim Neumann1, Uwe Kirchhefer2, Britt Hofmann3
1Institute for Pharmacology and Toxicology, Medical Faculty, Martin-Luther-University Halle-Wittenberg, Magdeburger Str. 4, Halle (Saale), D- 06097, Germany. joachim.neumann@medizin.uni-halle.de.
德克斯梅德托米丁是一种镇静剂,通过作用于心脏的H2-胺受体,可能会直接影响心脏功能. 它似乎还释放内源性类甲醇胺,影响心脏收缩性.
科学领域:
- 药理学 药理学是指药理学的学科.
- 心血管生理学心血管生理学
背景情况:
- 德克斯梅德托米丁 (Dexmedetomidine) 是一种经批准的镇静剂和焦虑缓解剂.
- 其已知的机制涉及对大脑α2-上腺素受体的激动作用.
- 众所周知,与其相关的化合物克隆尼丁可以刺激H2胺受体.
研究的目的:
- 为了调查德克斯梅德托米丁是否能刺激人类心脏心房的H2-胺受体.
- 为了探索德克斯梅德托米丁对心脏的直接影响.
主要方法:
- 对人类右心房准备剂 (HAP) 和小鼠左心房准备剂进行的实验.
- 对心房制剂的电刺激.
- 德克斯梅德托米丁,基洛斯塔米德,齐米蒂丁,普罗普兰诺洛尔,可卡因,组胺和罗利普拉姆的使用.
- 收缩力的评估.收缩的力量.
主要成果:
- 德克斯梅德托米丁 (10微米) 在人类心房制剂中增加了收缩力.
- 这些效应是由西洛斯塔米德,西米蒂丁,醇和可卡因调节的.
- 德克斯梅德托米丁在过度表达H2胺受体的小鼠心脏中表现出积极的内效应,这种效应被cimetidine逆转.
- 在野生类型的老鼠心脏中,效果被propranolol逆转,并被可卡因减弱.
结论:
- 德克斯梅德米丁表现出直接的心脏作用.
- 它可能会作为人类心脏H2-胺受体的部分激动剂.
- 它对人类心房的主要作用是释放内源性β-上腺素类类甲醇胺.
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