Fig. 2

Inhibition by CA of UPM-induced intracellular ROS generation. Effect of exposure to UPM (10 μg/mL) for 0 to 12 h on (a) NCI-H441 cells. Effect of exposure to UPM (10 μg/mL) for 12 h after pretreatment with CA (0.5, 1, 5, and 10 μM) for 24 h on NCI-H441 cells (b). Data are means ± SD of three experiments with triplicate samples and different letters indicate significant differences at p < 0.05 by Tukey’s multiple comparisons test