体外代谢活化对香烟烟雾诱导的细胞氧化损伤的影响

Effect of Metabolism Activation on the Oxidative Cell Damage Induced by Cigarette Smoking

目的探讨香烟烟雾对A549细胞的氧化损伤作用以及体外代谢活化对细胞氧化损伤效应的影响。方法香烟烟雾染毒A549细胞,在加与不加S9的条件下测定细胞活性氧(ROS)含量,检测细胞染色体、DNA损伤及抗氧化酶活性。结果随着香烟烟雾浓度的增加,加与不加S9细胞的ROS含量、DNA损伤、染色体损伤均增加,SOD和GSH-Px活性均降低。相同染毒剂量下,加S9细胞ROS含量高于不加S9细胞;加S9细胞微核率、拖尾率、LTail、OTM值均大于不加S9细胞;加S9细胞抗氧化酶活性的降低趋势较不加S9细胞更为显著。结论香烟烟雾对A549细胞具有氧化损伤作用,体外代谢活化可以增加细胞的氧化应激,从而加剧香烟烟雾对细胞的遗传毒性。

Objective To explore the effect of metabolic activation on the oxidative cell damage induced by mainstream smoke （MS）. Methods A549 cells were treated with different concentrations of MS for 2 hours in the presence and absence of S9 mix. ROS levels were determined. DNA and chromosome damages were detected. The activities of SOD and GSH-Px were measured. Results With different concentrations of MS treatment, the contents of ROS in the cells with S9 mix were significantly higher than those without S9 mix（P〈0.05）. More serious chromosome and DNA damages in the cells with S9 mix were observed than those without S9 mix. The micronucleus rate, comet rate, L Tail and OTM in the cells with S9 mix were significantly higher than those without S9 mix （P〈0.05）. With increased dose of MS, the activities of SOD and GSH-Px decreased in both cells with and without S9 mix. But the tendency of decrease in the cells with S9 mix was more obvious than those without S9 mix （P〈0.05）. Conclusion MS induces oxidative damage in A549 cells and the metabolic activations could increase the oxidative stress and potentiate the cellular genotoxicity.