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作 者:曹剑锋[1,2] 张鹏英[2] 王超英[1] 候东 陈靠山[2]
机构地区:[1]贵州师范学院,贵州省生物资源开发利用特色重点实验室,贵阳550018 [2]山东大学生命科学学院,济南250100
出 处:《中国实验方剂学杂志》2013年第23期258-261,共4页Chinese Journal of Experimental Traditional Medical Formulae
基 金:贵州师范学院博士基金(12BS032);贵州省科技厅基金项目(黔科合J字[2013]2233);山东省优秀中青年科学家科研奖励基金(BS2011SW016);贵州省重点支持学科建设项目(2011231)
摘 要:目的: 探讨牛蒡根水提物对大鼠离体胸主动脉环的舒张作用及其作用机制。 方法: 采用测定离体血管环张力的方法,观察牛蒡根水提物(0.075~15 gL-1)分别对基础状态、去氧肾上腺素(PE) 510-6mol·L-1和氯化钾(KCl 40 mmol·L-1) 预收缩的内皮完整血管环和去内皮血管环的舒张作用;并观察左旋硝基精氨酸甲酯(L-NAME, 10-4mol·L-1) 和亚甲蓝鸟苷酸环化酶抑制剂(ODQ, 10-5mol·L-1)、吲哚美辛(Indo, 10-5mol·L-1)、 四甲基乙二胺(TEA, 10-4mol·L-1)预处理对牛蒡根水提物的舒张血管作用的影响。 结果: 牛蒡根水提物对基础状态的内皮完整和去内皮血管环的张力无影响;对PE预收缩的去内皮和内皮完整血管环具有浓度依赖性舒张作用;L-NAME(P〈0.01)和ODQ(P〈0.05)预处理可明显减弱牛蒡根水提取物的舒血管作用,Indo预处理没有作用;TEA预处理(P〈0.05)显著性增强牛蒡根水提物舒张PE预收缩血管的作用;对KCl 预收缩的内皮完整血管环有明显舒张作用。 结论: 牛蒡根水提物能引起血管发生内皮依赖性和非内皮依赖性的舒张作用,其作用机制可能涉及促进血管内皮NO释放和血管平滑肌细胞的Ca2+激活。Objective: To investigate the vasodilative effect and the possible mechanisms of aqueous extract of Arctium lappa roots on the thoracic aorta rings of rats. Method: The study was performed with the model of isolate rat thoracic aorta rings in organ bath. Result: Aqueous extract of A. lappa roots did not directly relax or constrict vascular rings. Aqueous extract of A. lappa roots (0.075-15 g L-1) caused concentration-dependent relaxation with Phenylephrine (PE 510-6mol L-1) preconstricted aorta rings with or without endothelium. The extent of relaxation was larger in endothelium-intact aortic rings than that in endothelium-denuded aortic rings. Relaxation effects were reduced partially but significantly by pretreatment with (ω-nirto-L-arginine methyl ester (L-NAME, 10-4mol L-1),1H-[1,2,4] oxadiazolo [4,3,a] quinoxalin-1-one (ODQ, 10-5mol L-1) in endothelium-intact aortic rings. However,they were not affected by indomethacin(10-5mol L-1). The relaxation response of aqueous extract of A. lappa roots was significantly enhanced by potassium channel inhibitors Tetraethylammonium chloride(TEA). The aqueous extract of A. lappa roots caused concentration-dependent relaxation in 40 mmol L-1 KCl aorta rings. Conclusion: Aqueous extract of A. lappa roots causes relaxation of aortic rings through endothelium-dependent and independent pathways. The mechanisms might be involved the release of NO from endothelium and is possibly mediated by the activation of Ca2+ channel.
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