丹皮酚对自发性高血压大鼠动脉血压和血流量的影响及其与血管舒缩相关的作用机制

前期研究发现丹皮酚能显著对抗大鼠急性心肌缺血和梗死,该实验进一步研究其对自发性高血压大鼠动脉血压和血流量的影响,并探索其与血管舒缩相关的作用机制。首先,采用自发性高血压大鼠30只,随机分为自发高血压对照组和丹皮酚高、低剂量组,另以10只Wistar大鼠作为健康对照组。分别于给药前和十二指肠一次性给药后用颈动脉插管法测定动脉血压,并通过在体动物血流仪测定肾动脉和颈动脉的血流量,自发高血压对照组和健康对照组同法给予相同体积的溶剂,其余操作相同。为进一步研究丹皮酚对血管舒缩功能的影响,采用离体微血管动力描记技术,以一定浓度的预收缩剂收缩血管后,累加浓度法加入丹皮酚,分别记录丹皮酚对自发性高血压大鼠肠系膜上动脉、肾动脉和冠状动脉的舒张效应。丹皮酚可显著降低自发性高血压大鼠的动脉收缩压和舒张压,其中降低收缩压的作用更为明显,可显著增加自发性高血压大鼠的颈动脉和肾动脉血流量;可浓度依赖性地舒张自发性高血压大鼠的肠系膜上动脉、肾动脉和冠状动脉。结果表明,丹皮酚对自发性高血压大鼠具有显著降低动脉血压、增加动脉血流量的作用,该作用与其显著的扩血管效应有关。

Effect of paeonol on blood pressure and blood flow in artery of spontaneously hypertensive rats and its mechanisms related on vasomotion

Previous studies have shown that paeonol can antagonize acute myocardial ischemia and infarction in rat. This study further researched the effects of paeonol on blood pressure and blood flow in the artery of spontaneously hypertensive rats and its mechanisms related on vasomotion. Firstly, thirty spontaneously hypertensive rats were randomly divided into spontaneously hypertensive control group and paeonol-treating groups of high dose and low dose, and also, the other ten Wistar rats as healthy control group. Before and after the intraduodenal administration of the drug, arterial blood pressure was measured by carotid artery and blood flow through the renal artery and carotid artery in vivo were measured by animal flowmeter. The same volume of solvent was given to the spontaneously hypertensive control group and the healthy control group, and the other operations were same. In order to further study the effect of paeonol on vasomotor function, the superior mesenteric artery, renal artery and coronary artery of the spontaneously hypertensive rat were removed and separated, precontracted by a certain concentration of potassium chloride(KCl) and 5-serotonin(5-HT) respectively, and dilatory responses were assessed by cumulative addition of paeonol. Results showed that after duodenal one-time delivery of paeonol, the blood pressure significantly lowered, the renal arterial blood flow and the carotid arterial blood flow significantly increased in spontaneously hypertensive rat. And also, paeonol relaxed the mesenteric artery, renal artery and the coronary artery of spontaneously hypertensive rat in a concentration-dependent manner. These results indicated that the effect of paeonol on decreasing arterial blood pressure and increasing the arterial blood flow was related to its vasodilative effect.