Fig. 2
From: Role of PM2.5 in the development and progression of COPD and its mechanisms
Effects of PM2.5 on the cytokines release of IL-6 and IL-8 in HBEs. HBEs were, respectively, incubated with CSE (25 μg/ml) or 25 μg/ml to 200 μg/ml PM2.5 for 24 h to examine the levels of pro-inflammatory cytokines by ELISA. a IL-6, b IL-8. HBEs were co-stimulated with CSE and different concentrations of PM2.5 for 24 h to examine the levels of proinflammatory cytokines by ELISA. c IL-6, d IL-8.The results are mean ± SD of three independent experiments. *P < 0.05, ** P < 0.01, *** P < 0.001 vs control group; #P < 0.05, ## P < 0.01, ### P < 0.001 vs CSE group