白藜芦醇苷对大鼠内毒素休克性肺损伤的保护作用

目的 :研究白藜芦醇苷 (PD)对内毒素休克大鼠肺损伤的保护作用。方法 :将大鼠随机分为单纯手术组、内毒素休克组、PD预防组和PD治疗组4组。利用静脉注射内毒素复制大鼠内毒素休克的动物模型。对各组大鼠平均动脉压 (MAP)的动态变化、肺系数、肺通透指数、肺泡灌洗液 (BALF)中蛋白含量、肺组织一氧化氮合酶 (NOS)含量等指标进行观测 ,并结合光镜下肺组织的病理变化 ,探讨PD对内毒素休克性肺损伤的保护作用。结果 :PD可不同程度地阻止内毒素引起的血压下降 ,明显降低内毒素导致的肺系数、肺通透指数、BALF中蛋白含量、NOS含量的增高 ,从而减轻内毒素导致肺组织病理损伤的程度 ,且PD预防组较PD治疗组的效果更好。结论 :PD对大鼠内毒素休克性肺损伤具有保护作用 ,且预防性用药效果更佳。

Protective Effects of Polydatin on Acute Lung Injury Following Endotoxic Shock in Rats

OBJECTIVE:To investigate the protective effect of Polydatin on acute lung injury following endotoxic shock in rats.METHODS:Using a rat endotoxic shock model,animals were randomly divided into4groups∶sham operation group,enˉdotoxic shock group,Polydatin treatment group and Polydatin pretreatment group.MAPs(mean artery pressures)were meaˉsured at given time points.At the end of the experiment,the serum,the lung tissue,and the bronchoalveolar lavage fluid(BALF)were collected.The levels of lung coefficient,lung penetrating index(LPI),the protein concentration of BALF and the content of NOS in the lung tissue were measured.Furthermore,the histologic changes of the lung were observed under light microˉscope.RESULTS:In addition to prohibiting the dropping of MAP,Polydatin could mitigate the acute lung injury induced by endotoxin which increased the levels of lung coefficient,LPI,the protein concentration of BALF and the content of NOS in lung tissue.Enough morphological evidence could be found in pathological sections.Especially,the protective effects were more obˉvious in Polydatin pretreatment group.CONCLUSION:Polydatin has prophylactic and therapeutical effects on acute lung injury following endotoxic shock and the prophylactic effect is more marked than the therapeutic one.