微毛诃子对家兔胸主动脉环的作用及其机制  被引量:6

Effect and Mechanism of Terminalia chebula var. tomentella on Rabbit Thoracic Aorta

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作  者:杨盛春[1] 赖泳[1] 杜月[1] 李代航 莽朝永[1] 

机构地区:[1]大理学院药学与化学学院,云南大理671000

出  处:《中国实验方剂学杂志》2014年第13期134-137,共4页Chinese Journal of Experimental Traditional Medical Formulae

基  金:国家自然科学基金项目(81241139);云南省重点产业创新工程项目(2008IF012)

摘  要:目的:研究微毛诃子甲醇提取物和乙醇提取物对家兔离体胸主动脉环的作用并探讨其可能的作用机制.方法:采用累积加药法,观察0.01 ~0.08 g·mL-1微毛诃子对家兔离体胸主动脉环血管张力的影响;观察乙酰胆碱、酚妥拉明预处理对0.01 g·mL-1微毛诃子缩血管作用的影响;采用Ca2剥夺和复加法,观察0.01 g·mL-1微毛诃子对细胞内钙释放和外钙内流动脉收缩作用的影响.结果:微毛诃子甲醇提取物浓度依赖性对内皮完整的家兔胸主动脉环收缩幅度低于内皮不完整的收缩幅度(P<0.05),乙醇提取物对内皮完整的家兔胸主动脉环收缩幅度高于内皮不完整的收缩幅度(P<0.05),且具有浓度依赖性;0.01 g·mL-1的微毛诃子的甲醇提取物或乙醇提取物均可使乙酰胆碱(Ach,1×10^-5mol·L^-1)、酚妥拉明(10 mg·L^-1)预舒张的血管条收缩;维拉帕米(1×10^-7 mol·L^-1)预处理可消除0.01 g·mL^-1微毛诃子甲醇提取物的缩血管作用;在无Ca2+液中,0.01 g·mL^-1的微毛诃子甲醇提取物对去内皮主动脉环的收缩幅度显著低于有Ca2液中的收缩幅度(P<0.05).结论:微毛诃子甲醇提取物和乙醇提取物对家兔离体胸主动脉均有收缩作用;其缩血管作用可能与M受体及α受体有关;微毛诃子甲醇提取物的收缩作用具有内皮依赖性,可能与其促使血管平滑肌细胞外Ca2+内流进入细胞有关.Objective: To study the effect of methanol extract (ME) and ethanol extract (EE) of Terminalia chebula var. tomentella on rabbit thoracic aorta and to discuss the preliminary mechanism. Method: The method of cumulative dosing (concentration of extracts increased from 0. 01 g ·mL^-1 to 0. 08 g ·mL^-1, respectively. ) was used to observe the influence on the tension of rabbit thoracic aorta. The effect of extracts of T. chebula var. tornentella (0. 01 g·mL^-1) on vasoconstrictive action after acetylcholine and phentolamine prctreatment, in the absence of calcium and increasing calcium the effect of extracts T. chebula tomentclla (0. 01 g·mL^-1 ) on arterial systole was observed under the condition of intraceflular calcium release and calcium influx. Result: The influence of ME on contraction extent of isolating thoracic aorta with endothelium was not obvious compared with the thoracic aorta without endothelium (P 〈 0.05). The action of EE was more obvious P 〈 0.05) and showed concentration dependent. ME (0.01 g · mL^-1) and EE (0.01 g· mL^-1) all depressed the predilated vascular strips by acetylcholine-induced (1 × 10^-5 mol· L^-1) and phentolamine-induced (10 mg·L^-1), respectively. The vasoconstrictor effect of ME (0.01 g·mL^-1 ) was inhibited by verapamil. In the absence of Ca^2+ solution, thecontraction amplitude in endothelium-denuded aorta rings treated by ME (0. 01 g ·mL^-1) was significantly lower than those of contraction in Ca^2 + solution (P 〈 0.05) .Conclusion: ME and EE has contraction effect on rabbitthoracic aorta and the mechanism of vasoconstrictor effect may be in connection with M receptor, α-receptorand Ca^2+.

关 键 词:微毛诃子醇提取物 缩血管 胸主动脉环 乙酰胆碱 酚妥拉明 维拉帕米 

分 类 号:R285.5[医药卫生—中药学]

 

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