H9c2 cells were transfected with Sirt1 siRNA (sc-108043) or control siRNA with Sirt1 siRNA Transfection Reagent (Santa Cruz) when cells proliferated to 50% to 60% confluence, according to manufacturer's instructions. Similarly, H9c2 cells were transfected with Sirt3 siRNA or control siRNA with Lipofectamine 2000 (Invitrogen). The sense sequences of Sirt3 siRNA was as follows: 5′-UUC UCC GAA CGU GUC ACG UTT-3′ (Genepharma, Shanghai, China) (10 (link)).