Figure 1.

Effects of various concentrations of CDDO on cell viability in H₂O₂-exposed PC-12 cells. Cells were treated with H₂O₂ (500 μM) and different concentrations of CDDO (5, 10, 15, 20, 25, and 30 μg/mL) for 24 h. Cell viability was assessed using the MTT assay. The first bar (Con) represents control cells without treatment, while the second bar (Con + H₂O₂) represents cells treated with H₂O₂ alone. Bars indicate the mean cell viability percentage relative to the untreated control; error bars represent SEM. Statistical significance compared to the H₂O₂-alone-treated group is indicated by ** (p < 0.01) and *** (p < 0.001). (n = 6).