白藜芦醇苷对慢性常压低氧性肺动脉高压模型中磷脂酶A2、一氧化氮和内皮素水平的影响

目的： 观察白藜芦醇苷（PD）对慢性常压低氧性肺动脉高压大鼠血浆及肺匀浆中磷脂酶A2(PLA2)、一氧化氮（NO）和内皮素1（ET-1）水平的影响，并探讨可能的机制。 方法: 29只健康SD大鼠随机分为正常对照组、单纯低氧组和低氧加PD组。右心导管法检测大鼠肺动脉平均压力（mPAP），观察右室/左室+室间隔重量比值（R/L+S）、血浆及肺匀浆中PLA2活性、NO和ET-1含量的变化。 结果: 低氧21 d后大鼠mPAP、R/L+S、血浆及肺匀浆中PLA2活性和ET-1含量显著高于对照组，NO含量显著低于对照组。PD预处理组上述变化可受抑制或减轻。 结论: PD可有效防治慢性常压低氧性大鼠肺动脉压力的升高，其机理与抑制PLA2活性及ET-1释放，促进NO产生有关。

Effects of polidatin on phospholipase A2, nitric oxide and endothelin-1 levels in serum and lung of hypoxic pulmonary hypertension rats

AIM: To investigate the effects of polidatin on phospholipase A_2(PLA_2),nitric oxide(NO),and endothelin-1(ET-1) levels in serum and lung homogenate of hypoxic pulmonary hypertension rats.METHODS: 29 healthy Spraugue-Dawley rats were randomly divided into normal control group,chronic hypoxic group and hypoxic plus polidatin group.The model of chronic hypoxic pulmonary hypertension was made by method of intermittent isobaric hypoxia for 21 days.The mean pulmonary arterial pressure(mPAP) was measured by inserting a microcatheter into the pulmonary artery.The ratio of right ventricular wall and that of left ventricular wall and ventricular septum weight(R/L S) was measured as well.RESULTS: After exposed to hypoxia for 21 days,the mPAP,R/L S,PLA_2 and ET-1 activities in blood and lung homogenate increased significantly. The NO concentration decreased significantly.Pretreatment with PD attenuated these changes mentioned above.CONCLUSION: Pretreatment with PD effectively prevents the formation of chronic hypoxic pulmonary hypertension.Its mechanism may be related to the inhibition of PLA_2 and ET-1 and promotion of NO production.