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作 者:王召军[1,2] 邓春玉[3] 邝素娟[3] 农丽丹[2] 张光燕[2] 马珏[2] 崔建修[2]
机构地区:[1]南方医科大学,广东广州510515 [2]广东省医学科学院//广东省人民医院麻醉科,广东广州510080 [3]广东省医学科学院//广东省人民医院医学研究中心,广东广州510080
出 处:《南方医科大学学报》2015年第4期540-543,共4页Journal of Southern Medical University
基 金:国家自然科学基金(81273516);广东省自然科学基金(s2013010011516);广东省科技计划(2012B031800159)~~
摘 要:目的:研究白藜芦醇(Resveratrol, RES)对离体人肺内小动脉血管张力的影响及其机制。方法显微镜下分离直径为1-1.5 mm的人肺内小动脉,制备成1.8-2.0 mm的血管条,使用微血管张力测定技术,分别给予血管收缩剂血栓素A2受体激动剂(U46619)、内皮素-1(ET-1)、60 mmol/L高钾溶液使血管产生持续性收缩,张力平稳后,采用累计加药法加入白藜芦醇,观察不同浓度白藜芦醇对预收缩的人肺内小动脉张力的影响;同时观察去内皮,以及加入L-NAME、吲哚美辛预孵育血管后,白藜芦醇能否使预收缩的血管舒张。白藜芦醇舒张实验同时用等体积的药物容积二甲亚砜(DMSO)作为对照。结果 RES能呈浓度依赖性舒张U46619(100 nmol/L)、ET-1(30 nmol/L)、60 mmol/L高钾预收缩内皮完整的人肺内小动脉,pD2分别为3.82±0.20,3.84±0.57,3.68±0.27,其最大舒张率(Emax)分别为(99.58±0.83)%,100%,(99.65±0.98)%;用L-NAME预孵育30 min内皮完整的人肺内小动脉血管环,在浓度100μmol/L时,同未加L-NAME孵育的血管环比较,两者之间具有统计学差异(P〈0.05);而用吲哚美辛预孵育30 min内皮完整的人肺内小动脉环不影响白藜芦醇的舒张作用,去除血管环的内皮亦同样不影响白藜芦醇的舒张作用。结论白藜芦醇具有浓度依赖性的舒张离体人肺内小动脉的作用,且无明显的内皮依赖性,其作用机制可能与促进NO的释放有关。Objective To determine the effect of resveratrol on constrictions of isolated human intrapulmonary arteries and its mechanisms. Methods Intrapulmonary arteries (1-1.5 mm in diameter) were dissected and cut into rings (1.8-2.0 mm in length) under microscope, and were then mounted in a Multi Myograph system. The rings were stimulated with 100 nmol/L U46619, 30 nmol/L endothelin-1, or 60 mmol/L KCl to produce sustained contraction of the intrapulmonary arteries, after which resveratrol was applied cumulatively. Endothelium denudation, L-NAME and indomethecin were used to investigate the effect of resveratrol on constrictions of the isolated arteries, suing DMSO as the control. Results Resveratrol induced concentration-dependent relaxations in endothelium-intact rings that contracted in response to stimulations with U46619, ET-1 and KCl, with pD2 of 3.82 ± 0.20, 3.84 ± 0.57, and 3.68 ± 0.27, Emax of (99.58 ± 0.83)%, 100%, and (99.65 ± 0.98)%, respectively. Treatment of the arterial rings with the eNOS inhibitor L-NAME, but not with indomethecin or endothelium denudation, obviously affected the relaxant effects of resveratrol. Conclusion Resveratrol can concentration-dependently produce relaxant effect on human intrapulmonary arteries independent of the endothelium possibly by promoting synthesis and release of NO.
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