【摘要】 目的探讨蝙蝠葛诺林碱对家兔基底动脉血管平滑肌的舒张作用。方法制备家兔基底动脉血管环,采用半对数摩尔浓度累积给药方法,观察给予蝙蝠葛诺林碱对家兔基底动脉血管平滑肌的舒张作用。结果蝙蝠葛诺林碱对甲氧胺、5-羟色胺、氯化钾和组胺所致的家兔基底动脉收缩均有明显的扩张作用,最大舒张50%(IC50)浓度分别为8.67×10-5,1.78×10-6,6.79×10-7,4.98×10-4mol·L-1。同时对甲氧胺、5-羟色胺、氯化钾和组胺所致量效曲线的影响,均显示为非竞争性拮抗作用。结论蝙蝠葛诺林碱通过非竞争性拮抗作用,能有效舒张家兔基底动脉血管平滑肌,改善脑循环。更多还原

【Abstract】 Objective To investigate the effect of daurinoline on basilar artery vascular smooth muscle. Methods The tension of isolated basilar artery ring of rabbit was measured. The effects of daurinoline on the basilar artery contracted by methoxamine,5-hydroxytryptamine(5-HT),KCl and Histamine( His) were also examined. Dose-response curves of 5-HT and KCl were observed as well. Results Daurinoline exerted obvious relaxation effect on the basilar artery vascular ring contracted by methoxamine,5-HT,KCl and His in a concentration-dependent manner. IC50of daurinoline in methoxamine,5-HT,KCl and His-treated rabbits was 8. 67 × 10- 5,1. 78 × 10- 6,6. 79 × 10- 7and 4. 98 × 10- 4mol · L- 1,respectively. The change of concentration-response curves of methoxamine,5-HT,KCl and His showed that daurinoline was a non-competitive antagonist.Conclusion Daurinoline exerts marked relaxation effect on basilar artery of rabbits through non-competitive antagonism. The mechanism of relaxation action may be related to blockage of voltage-dependent or receptor-dependent calcium channels.更多还原