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Effect of ouabain on the aortic rings of guinea pig and its interactions with Ca2+, norepinephrine
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- Author:
- No author available
- Journal Title:
- ACTA PHARMACEUTICA SINICA
- Issue:
- 11
- DOI:
- 10.3321/j.issn:0513-4870.2003.11.004
- Key Word:
- 哇巴因;血管平滑肌;去甲肾上腺素;钙拮抗剂
Abstract： 目的观察哇巴因(ouabain,Oua)对豚鼠血管平滑肌的作用,及其与Ca2+和去甲肾上腺素(NE)的相互作用关系.方法利用豚鼠离体胸主动脉环,观察药物对其张力的影响.结果无论有无内皮存在,Oua均能剂量依赖性地直接收缩血管平滑肌.在无钙溶液中,Oua不能引起血管收缩.Oua可使NE的量效曲线平行左移,Emax不变;Oua可使CaCl2的量效曲线左移上移,Emax增大.硝苯地平和维拉帕米可使Oua所致的血管收缩曲线下降.结论Oua所致的血管收缩作用不依赖于血管内皮的存在,但依赖于细胞外钙,并且能被钙拮抗剂所拮抗;NE与Oua,Ca2+对血管平滑肌的收缩呈协同作用.
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