Pathological myocardial remodelling is the initiation of pressure overload-induced heart failure, and its involvement in the associated molecular mechanisms remains to be fully elucidated. The aim of this study was to investigate whether Sirtuin3 (SIRT3) can affect pathological myocardial remodeling by regulating cellular cuproptosis and its potential mechanisms. In this study, we found that pressure overload induced pathologic myocardial remodeling in which cardiomyocytes showed a distinct cuproptosis signature accompanied by downregulation of SIRT3 expression. In vitro experiments demonstrated that copper ions reduced SIRT3 expression by 40 % (p