Effects of treatments with Doxo alone and in combination with radicicol on MnSOD (A) gene and (B) protein expression of the H9c2 cells. Doxo (1 µM) was administered for 3 and 6 h, and where indicated, radicicol (1 µM) was administered 30 min prior to Doxo. (A) MnSOD mRNA levels were evaluated in the H9c2 cells by RT-qPCR, with the data normalized to the HPRT1 gene, The data are presented as the means ± SD for at least 3 independent experiments, which each performed in triplicate. (B) Superoxide dismutase (MnSOD) levels in the cytosol revealed by flow cytometry of the H9c2 cells. Data are the means ± SEM for the percentages of MnSOD-positive cells, from at least 3 independent experiments, each performed in duplicate. *P<0.05 vs. control; (one-way ANOVA and multiple comparisons by Bonferroni's test). Doxo, doxorubicin; Rad, radicicol.