牛磺酸对大鼠肢体缺血/再灌注后肺组织损伤的保护作用

THE PROTECTIVE EFFECT OF TAURINE ON LUNG INJURY FOLLOWING LIMBS ISCHEMIA/REPERFUSION OF RATS

目的 :观察大鼠肢体缺血再灌注 (LIR)后肺组织形态学的变化及牛磺酸对其影响。方法 :Wistar大鼠随机分为 3组 ,对照组 (control)、缺血 /再灌注组 (LIR)、牛磺酸 +缺血 /再灌注组 (Tau +LIR) ,各组动物通过大体、光镜和透射电镜观察肺组织形态学变化 ,并测定肺系数和肺通透指数及肺组织活性氧和MDA含量。结果 :大鼠LIR后肺组织出现以肺泡毛细血管膜通透性增加为特征的组织细胞损伤 ,光镜下显示毛细血管扩张充血、血管周围间隙增大、肺泡腔中有大量蛋白渗出物 ,电镜下可见肺泡上皮细胞之间、毛细血管内皮之间的紧密连接松解 ;肺系数和肺通透指数升高 ;肺组织活性氧及MDA含量增加。提前给予外源性牛磺酸可使肺组织损伤变化减轻。结论 :牛磺酸对大鼠LIR后肺损伤有保护作用 ,其保护机理之一与其抗氧化 。

Aim:On the model of limb ischemia/reperfusion (LIR), the effects of taurine on pulmonary morphological changes in rats were observed. Methods: Wistar rats were divided into three groups(n=8): control group, ischemia/reperfusion group (IR) and taurine+IR (Tau+IR). Then macroscopic inspection and optical and transmission electron microscopies(TEM) were performed to assess the morphological changes of the lung tissues and their lung index (LI) and lung permeability index (LPI) and reactive oxygen species (ROS), malondialdehyde(MDA) were measured as well. Results: The morphological changes of lung tissue after LIR were characterized by an increase of permeability of the alveolio-capillary membrane and infiltration of inflammatory cells. Under optical microscopy, there were congestion and swelling in pulmonary microvessels with broadened the spaces around the blood vessels. Under TEM, a number of tight-junctional regions between adjacent alveolar epithelial cells and between pulmonary microvessels endothelium were 'open'. The LI, LPI,MDA and ROS increased. The specimens of Taurine +IR group revealed slight to moderate degrees of damages in the lung tissues. Conclusion: Taurine protects lung from LIR in rats and the protective action on tight-junctional regions between cells and anti-oxygen is one of the protective mechanisms of taurine.