Résumé
Objective To investigate the effect of low-dose arsenious acid solution (As(III)) combined with total particulate matter (TPM) from cigarette smoke on cellular oxidative stress in human lung cancer cell line A549 cells. Methods A549 cells were divided into four groups: negative control group (0.75% DMSO), low dose As(III) group (0.88% μg/mL, 75% DMSO), cigarette smoke TPM group (75 μg/mL), and combined exposure group (75 μg/mL TPM, 0.88 μg/mL As (III)). After 24 hours' exposure, the superoxide dismutase (SOD) level in cell culture medium and intracellular 8-hydroxy-2-deoxyguanosine (8-OHdG) content were detected by ELISA, and intracellular reactive oxygen species (ROS) level was detected by fluorescent probe DCFH-DA. 2×2 factorial design was used to evaluate the interaction. Results Compared with the control group, the level of SOD in the combined exposure group was significantly increased (P<0.05). In addition, the ROS content in the combined exposure group and TPM alone group was significantly increased (P<0.05). The levels of 8-OHdG in the combined exposure group and low-dose As(III) treated group were significantly higher than those in the control group(P<0.05). The results of the factorial analysis showed that low-dose As(III) and TPM had interaction on SOD levels, ROS and 8-OHdG contents in A549 cells. The effects on SOD and ROS were synergistic, while the effect on 8-OHdG was antagonistic. Conclusion Low-dose arsenious acid solution As(III) and TPM in cigarette smoke have interaction on oxidative stress in A549 cells.