白藜芦醇对血管钙化大鼠血压和心脏功能的影响

目的观察白藜芦醇对维生素D3和尼古丁诱导的血管钙化大鼠血压和心脏功能的影响。方法选取32只雄性SD大鼠,随机分为对照组、钙化组、白藜芦醇低剂量处理组和高剂量处理组等4组。6周后观察其血压、心功能指标、血清和主动脉碱性磷酸酶活性以及主动脉HE染色。结果与对照组比较,钙化组大鼠的左心室质量指数、心率、收缩压、脉压差、平均动脉压、左室收缩末压、血清和主动脉碱性磷酸酶活性分别升高27.3%、8.8%、22.8%、47.5%、13.6%、19.0%、280%和265%(P0.05或P0.01)。与钙化组比较,白藜芦醇低剂量处理组的脉压差、血清和主动脉碱性磷酸酶活性分别降低和8.5%、34.5%和29.5%(P0.05或P0.01);白藜芦醇高剂量处理组的左心室质量指数、收缩压、脉压差、平均动脉压、左室收缩末压、血清和主动脉碱性磷酸酶活性分别降低14.2%、13.6%、23.7%、10.0%、9.0%、53.1%和45.9%(P0.05或P0.01)。白藜芦醇高剂量与低剂量处理组相比其收缩压、脉压差、左室收缩末压、血清和主动脉碱性磷酸酶活性分别降低8.3%、16.7%、5.8%、28.4%和23.2%(P0.05或P0.01)。HE染色显示:与对照组比较,钙化组大鼠主动脉管壁厚度增加,中膜弹力纤维紊乱,白藜芦醇处理组主动脉管壁厚度减小,弹力纤维排列有序。结论白藜芦醇能够有效降低血管钙化大鼠血压和改善心脏功能。

Effects of resveratrol on blood pressure and cardiac function in rats with vascular calcification

Objective To observe the effects of resveratrol on blood pressure and cardiac function in the rats with vascular calcification induced by vitamin D₃ plus nicotine. Methods 32 male SD rats were randomly divided into the following groups for treatment: Control (Con), calcified (Cal), Cal+Res low dose [L] and Cal+Res high dose [H] groups. Blood pressure, cardiac function, alkaline phosphatase (ALP) activity in serum or aorta were detected and HE staining was used for pathological examination at 6 weeks after treatment. Results Compared with the Con group, LVW/BW, heart rate, systolic aortic pressure, pulse pressure, mean blood pressure, left ventricular systolic pressure and ALP activity in serum or aorta of rats in the Cal group were increased by 27.3%, 8.8%, 22.8%, 47.5%, 13.6%, 19.0%, 280% and 265% (P<0.05 or P<0.01), respectively. Compared with the Cal group, pulse pressure and ALP activity in serum or aorta of rats in the Cal+Res [L] group were decreased by 8.5%, 34.5% and 29.5% (P<0.05 or P<0.01), respectively, and LVW/BW, systolic aortic pressure, pulse pressure, mean blood pressure, left ventricular systolic pressure and ALP activity in serum or aorta of rats in the Cal+Res [H] group were decreased by 14.2%, 13.6%, 23.7%,10.0%, 9.0%, 53.1% and 45.9% (P<0.05 or P<0.01), respectively. Compared with the Cal+Res [L] group, systolic aortic pressure, pulse pressure, left ventricular systolic pressure and ALP activity in serum or aorta of rats in the Cal+Res [H] group were decreased by 8.3%, 16.7%, 5.8%, 28.4% and 23.2% (P<0.05 or P<0.01), respectively. Compared with the aorta in the Con group, pathological examination revealed thickened vessel walls and disordered elastic fibers in the calcified aortas. However, the thickness of aortic wall in the Cal+Res [L] and Cal+Res [H] groups was reduced and elastic fibers were regularly arranged. Conclusion Resveratrol can effectively reduce the blood pressure and improve the cardiac function in rats with vascular calcification.