Pretreatment with RS decreases caspase-9 and cyt c mRNA expression, and increases UCP2 and PPAR-γ mRNA expression 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. Reverse transcription-quantitative polymerase chain reaction was performed to analyze the mRNA expression levels of (A) caspase-9, (B) cyt c, (C) UCP2 and (D) PPAR-γ in cardiomyocytes. *P<0.05 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<0.05 and −−P<0.01 vs. the RS + OGD/R + siPPAR-γ group. OGD/R, oxygen-glucose deprivation/reperfusion; cyt c, cytochrome c; RS, rosuvastatin; ATR, atractyloside; si, small interfering RNA; PPAR-γ, peroxisome proliferator-activated receptor-γ; UCP2, mitochondrial uncoupling protein 2.