APE1/Ref-1表达在小鼠放射性肺损伤形成中的变化特点

目的 观察小鼠放射性肺损伤过程中DNA损伤修复关键酶脱嘌呤/脱嘧啶核酸内切酶/氧化还原因子(apurinic/aprimidinic endonuclease/redox factor-1,APE1/Ref-1)表达的动态变化,初步探讨APE1/Ref-1在放射性肺损伤发生、发展中的作用.方法 雌性昆明小鼠30只,随机分为照射组18只和对照组12只.照射组用8MV直线加速器给予小鼠全胸20Gy单次照射,对照组佯装照射.在照射后1、3、7、14、28、56d共6个时相点,分批活杀小鼠(照射组3只,对照组2只),观察其全肺大体形态改变,取右肺组织,光镜下观察组织形态学变化,免疫组化SP法检测APE1/Ref-1;取左肺组织,Western blot方法检测APE1/Ref-1蛋白表达.结果 正常小鼠肺组织上皮细胞和内皮细胞中APE1/Ref-1呈胞核表达为主,而在小鼠放射性肺损伤不同阶段肺组织上皮细胞和内皮细胞中APE1/Ref-1表达特征有所改变,呈核浆共同表达和胞浆表达为主;并且APE1/Ref-1表达呈现先增高后降低的趋势,照射后1d开始升高,3d达高峰,且明显高于对照组,此后随着小鼠放射性肺损伤发展逐渐降低,28d降至对照组水平,56d明显低于对照组.结论 电离辐射可以刺激APE1/Ref-1蛋白的表达并使其表达发生由核内转向浆内和先增高后降低的特征改变,表明APE1/Ref-1可能在放射性肺损伤修复过程中起着重要作用.

APE1/Ref-1 expression in development of radiation pulmonary injury of mouse

Objective To explore the relationship between APE1/Ref-1 and radiation pulmonary injuries by observing the dynamic changes in APE1/Ref-1 expression during the course of development of radiation pulmonary injuries in mouse.Methods Thirty adult female Kunming mice were randomly assigned into 6 groups.In every group 3 mice were irradiated with a single dose of 20 Gy to their whole lung with an 8 MV linear accelerator and 2 mice were received sham irradiation.After radiation,animals were sacrificed on 1,3,7,14,...