埃他卡林对慢性低氧大鼠肺动脉血管内皮生长因子mRNA和蛋白表达的影响

目的:研究新型ATP敏感性钾通道开放剂埃他卡林(IVT)对低氧性肺动脉高压(HPH)大鼠肺动脉血管内皮生长因子(VEGF)表达的影响.方法:雄性SD大鼠36只随机分成对照组、HPH模型组、IPT干预组,每组12只.IPT干预组给予IPT1.5 mg/(kg·d)灌胃,对照组及HPH模型组给予0.9%NaCl 5 ml/(kg·d)灌胃.HPH组及IPT干预组在(10.0 ±0.5)%氧浓度下饲养,每天8 h.每周6天,4周时测定平均肺动脉压(mPAP)、RV/(LV+S),逆转录聚合酶链式反应(Rr-PCR)和Western-blot技术检测各组肺动脉主干VEGF mRNA和蛋白的表达.结果:①HPH模型组大鼠mPAP和RV/(LV+S)显著高于对照组(P<0.01),IPT干预组mPAP和RV/(LV+S)较HPH模型组显著下降(P<0.01).②HPH模型组大鼠肺动脉VEGF mRNA及蛋白表达高于对照组,两者具有显著统计学意义(P<0.01),IPT干预组与HPH模型组比较,VEGF mRNA及蛋白表达均下降(P<0.01);IPT干预组与对照组比较,VEGF mRNA及蛋白表达差异无显著性(P>0.05).结论:HPH模型大鼠肺动脉VEGF mRNA及蛋白表达增加,IPT可明显抑制慢性低氧大鼠肺动脉VEGF mRNA和蛋白的表达.

Effects of iptakalim on the mRNA and protein expression of VEGF in the pulmonary artery of claronically hypoxic rats

Objective:To study the effects of a new ATP-sensitive potassium channel opener,iptakalim(IPT),on the mRNA and protein expression of vascular endothelial growth factor(VEGF) in the pulmonary artery of rats with hypoxic pulmonary hypertension(HPH).Methods:Thirty-six Sprague-Dawley(SD) male rats were randomly divided into three equal groups:the control group and hypoxic group were given 5 ml /(kg.d) 0.9% sodium chloride,ig;the treated group were given 1.5 mg /(kg.d)] IPT,ig.excepting the first group,the other ...