Figure 5

Time- and concentration-dependent release of IL-6 (A) and IL-8 (B). Human bronchial epithelial BEAS-2B cells were exposed to increasing concentrations of DEPs (0-400 μg/ml) for 2, 4, 6 or 24 h. Cytokine concentrations were determined by ELISA. Histograms represent means ± SEM of separate experiments (n = 3). * p < 0.05; exposed vs. unexposed cells at each time point.