RS downregulates protein expression levels of caspase-9 and cyt c, and upregulates protein expression levels of UCP2 and PPAR-γ following OGD/R damage. Cardiomyocytes were divided into the following groups: Control, control + siPPAR-γ, OGD/R, OGD/R + siPPAR-γ, RS + OGD/R, RS + OGD/R + siPPAR-γ, ATR + RS + OGD/R, ATR + RS + OGD/R + siPPAR-γ. (A) Western blot analysis was used to detect the protein expression levels of caspase-9, cyt c, UCP2 and PPAR-γ in cardiomyocytes. (B) The protein expression levels were quantitatively analyzed according to the protein gray values. **P<0.01 and ***P<0.001 vs. the control group; #P<0.05 and ##P<0.01 vs. the OGD/R group; +P<0.05 and ++P<0.01 vs. the OGD/R + siPPAR-γ group; −−P<0.01 vs. the RS + OGD/R + siPPAR-γ group. OGD/R, oxygen-glucose deprivation/reperfusion; cyt c, cytochrome c; PPAR-γ, peroxisome proliferator-activated receptor-γ; UCP2, mitochondrial uncoupling protein 2; RS, rosuvastatin; ATR, atractyloside; si, small interfering RNA.