巯基丙酰甘氨酸对严重烫伤延迟复苏大鼠氧自由基作用的观察

An observation of the effects of Tiopronin on oxygen free radicals in severely scalded rats receiving delayed fluid resuscitation

目的 观察严重烫伤大鼠延迟复苏后氧自由基的损伤及巯基丙酰甘氨酸 (硫普罗宁 )的保护作用。 方法 制作大鼠 30 %Ⅲ度烫伤模型 ,分为延迟复苏组、巯基丙酰甘氨酸治疗组 ,应用电子自旋共振仪 (ESR)检测技术和传统间接检测手段 ,观察伤后 2 4、4 8h血浆及烧伤水肿液中超氧化物歧化酶 (SOD)、丙二醛 (MDA)变化 ,同时观察心、肝、肾、小肠的病理形态变化 ,检测血生化指标。设不烫伤大鼠为正常对照组。 结果 延迟复苏组大鼠较正常对照组血浆SOD含量下降 ,血浆及水肿液MDA明显升高 ,各脏器病理形态及血生化指标明显改变。巯基丙酰甘氨酸治疗组大鼠较延迟复苏组SOD增高 (P <0 .0 1) ,血液及痂下水肿液MDA含量下降 (P <0 .0 5 ) ,脏器病理形态及血生化指标有所改善。 结论 严重烫伤大鼠延迟复苏后存在氧化应激损伤 。

Objective To observe the harmful effects of oxygen free radicals and the protective roles of Tiopronin in severely scalded rats after delayed fluid resuscitation. Methods Rats inflicted with 30% Ⅲ degree scald on the back were employed as the model. They were divided into delayed resuscitation (D) and Tiopronin treatment (T) groups. The changes in superoxide dismutase (SOD) and malonyldialdehyde (MDA) in plasma and subeschar fluid were determined at 24 to 48 postburn hours (PBHs) by means of electron spin resonance (ESR) technique and other routine methods. And the pathomorphological changes in the heart, liver, kidneys and small intestine, and changes in the blood biochemical indices were simultaneously determined. Normal rats were taken as control group (N). Results The plasma SOD level was was lower than that in N group, while the MDA content in plasma and subeschar fluid in D group was much higher than that in N group. Changes in all the blood biochemical and internal organ pathomorphology were more obvious in the D group. on the other hand, the rat plasma SOD level in T group increased obviously ( P<0.01) while the MDA contents was decreased in T group (P<0.05) when compared with those rats of D group. In addition, the internal organ pathomorphology and blood biochemical indices were improved evidently in T group. Conclusion Oxidative stress injury was evoked in severely scalded rats after delayed fluid resuscitation, and it could be protected to some extent by Tiopronin. [