Effect of nitrones on the activities of phase II enzymes and intracellular GSH in H2O2-treated BAEC. BAEC were preincubated with different concentrations of nitrone (0–50 µM) and then challenged with 100 µM H2O2 for 24 h. After treatment cell extracts were prepared and assayed for (A) HO-1, (B) NQO1, (C) GR (D) GPx and (E) GSH, respectively. Results are represented as mean ± SEM, *p < 0.05 vs. control (untreated cells), and #p < 0.05 vs. H2O2-treated cells, where n = 3.