Figure 2.

Pre-treatment with 10 µM PUN for 24 h reduces UV-A-induced increase of reactive oxygen species (ROS) levels in ARPE-19 cells. Values are expressed as a percentage relative to the control (no pre-treatment, no radiations) and are presented as mean ± SEM of data from three separate experiments; each experiment was performed in duplicate. One-way ANOVA analysis followed by post hoc Newman–Keuls was carried out. *** = p < 0.001 vs. control; ^§§§ = p < 0.001 vs. UV-A alone at the same experimental time.