在自发高血压的老鼠中,血管β-上腺素放松受损:导管动脉和阻力动脉之间的差异
Pavol Valovič1, Michal Behuliak1, Ivana Vaněčková1
1Institute of Physiology, Czech Academy of Sciences, Prague, Czech Republic.
European journal of pharmacology
|September 14, 2023
概括
在自发高血压大鼠 (SHR) 的导管动脉中观察到受损的β-上腺素放松,但抵抗性动脉和对β-上腺素激动剂的血压反应在SHR和WKY大鼠中相似,这表明在高血压中的作用有限.
科学领域:
- 心血管生理学心血管生理学
- 药理学 药理学是指药理学的学科.
背景情况:
- 在自发高血压大鼠 (SHR) 中的高血压可能涉及受损的β-上腺素放松.
- 了解不同血管床中的β-上腺素反应对于高血压研究至关重要.
研究的目的:
- 为了研究SHR和WKY大鼠的管关动脉和阻力介质动脉中的β-上腺素放松.
- 评估内皮质和特定β-上腺素受体亚型在这些反应中的作用.
- 为了评估β-上腺激动剂对SHR和WKY大鼠血压的影响.
主要方法:
- 使用异上腺素,沙米特醇和多布胺的孤立动脉放松研究 (股骨和腹腔).
- 评估内皮依赖性和内皮独立性放松.
- 在激动剂的使用后,体内血压测量.
- 药理上阻断循环氧化酶 (英多甲) 和NO合成酶 (L-NAME).
主要成果:
- SHR大腿动脉显示β-上腺素放松性降低,特别是缺乏内皮独立成分.
- 来自SHR和WKY大鼠的中腔动脉表现出类似的内皮依赖和独立放松与异上腺素.
- 通过异上腺素和沙米特醇降低血压在SHR和WKY大鼠之间是可比的,在SHR中有一些由印米他辛和L-NAME的修改.
结论:
- 在SHR的导管动脉中减弱的β-上腺素放松似乎不是遗传高血压的主要贡献者.
- 在SHR和WKY大鼠中,类似的β-上腺素放松阻力介质动脉和可比血压对激动剂的反应,不支持该模型中改变β-上腺素血管扩张的显著作用.
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