【摘要】 目的观察低氧预适应(HP)对移植大鼠肝细胞线粒体超微结构的影响。方法采用改良的自体肝移植模型模拟肝移植过程,将72只SD大鼠随机分为正常对照(NC)、自体移植(AT)和低氧预适应(HP)3个组,每组24只。HP为术前用8氮氧混合气体处理90min,分别于术后1、6、24h处死大鼠取肝脏标本,透射电镜观察肝细胞及线粒体的形态学改变,并用图像分析系统定量评判线粒体超微结构的改变程度。结果透射电镜下见AT组线粒体肿胀明显,膜模糊不清,部分膜破裂,线粒体嵴疏松溶解,有空泡形成;而HP组线粒体结构基本正常,仅有轻度肿胀,线粒体排列整齐,膜基本完整,线粒体嵴密集,未见空泡形成;定量分析线粒体的面积、周长及直径均和AT组有显著性差异(P<0.05),HP组线粒体损伤程度较AT组有明显改善。结论线粒体超微结构的改变是移植后肝细胞损伤的早期变化,HP可改善这一变化以减轻肝细胞损伤。更多还原

【Abstract】 Objective To observe the effects of hypoxia preconditioning on the mitochondria ultrastructure of hepatocyte during liver transplantation in rats.Methods A modified orthopotic liver autotransplantation model was used to simulate liver transplantatation.Seventy two Sprague-Dawley rats were randomly divided into the following three groups:the normal control(group NC),the autotransplantation group(group AT),and the hypoxia preconditioning group(group HP),with twenty four rats in each group.Group HP were given an 8% oxygen atmosphere for 90 minutes before the operation.At 1,6,and 24 hours after the operation,the rats were killed and the following tests were conducted:1.The morphology of mitochondria was observed under transmission electron microscopy(TEM);2.Mitochondria were quantitatively analyzed by a MiVnt image analysis system.ResultsHepatic cells in group AT showed typical injury signs under TEM,the appearance of hepatocytes and mitochondria in group HP were much better than the group AT,and the areas,perimeters and diameters of mitochondria in group HP were much smaller than those in group AT by a significantly amount(P<0.05).Conclusion Changes of mitochondria ultrastructure were the early events in hepatocellular damage,which could be relieved by HP.更多还原