Effect of Spd, AG, Spd-AG and H2O2 in single and combined treatments on C2C12 myoblast viability. (A) C2C12 myoblasts were treated with different Spd concentrations (1–100 μM) for 24 h; (B) C2C12 myoblasts were treated with H2O2 0.3 mM, Spd 10 μM and AG 1mM in various combinations for 24 h. Cell viability was assessed by the trypan blue exclusion assay. Results are expressed as the number of cells (×1000). Data presented are the mean ± SEM of three experiments, each performed in triplicate. One-way ANOVA was performed, followed by Bonferroni’s multiple comparison tests for panels A and B, respectively. * p < 0.05; **** p < 0.0001.