Figure 1.

Effect of LPS on the cell viability and survival rate of alveolar type II epithelial cells. After A549 cells were incubated with various concentrations of LPS (0.5, 1.0, 1.5, and 2.0 mg/l) for 24 h, their cell viability was measured using CCK-8. The survival rate was then measured by the MTT assay. The data from three independent experiments are presented as the mean ± SEM. *P < 0.05, **P < 0.01 versus the control group. P < 0.05, the LPS (1.5 mg/l) group versus the LPS (1.5 mg/l) group and the LPS (2.0 mg/l) group. P > 0.05, the LPS (1.5 mg/l) group versus the LPS (2.0 mg/l) group.