Figure 4: Resveratrol pretreatment prolonged the phosphorylation of Akt and ERK, but not JNK and p38, in H2O2-treated MAC-T cells. (a) MAC-T cells were preincubated with or without resveratrol (50 μM) for 2 h and then treated with H2O2 (500 μM) for the indicated time points (0, 15, 30, 45, 60, and 90 min). (b) MAC-T cells were pretreated with vehicle or various concentrations of resveratrol for 2 h and then treated with H2O2 (500 μM) for 90 min. Phosphorylated Akt, ERK1/2, JNK1/2, and p38 were analyzed by Western blot analysis and quantified. Representative Western blots are shown. β-tubulin was used as a loading control. Quantified data are expressed in arbitrary units as mean ± SD of three experiments. means significantly different from untreated cells. means significantly different from H2O2-treated cells.