AimsMetabolic dysfunction-associated steatotic liver disease (MASLD), previously termed nonalcoholic fatty liver disease (NAFLD), has become a great public healthcare burden and is closely associated with type 2 diabetes (T2D) and insulin resistance. However, there is no specific treatment for MASLD. Recent clinical findings have indicated a possible beneficial effect of sodium-glucose cotransporter 2 (SGLT2) on MASLD. This study aimed to investigate the effects of dapagliflozin (Dapa) on MASLD in T2D mice.MethodsFour-week-old ob/ob mice were fed with a high-fat diet (HFD) for 8 weeks and then randomly divided into two groups supplemented with Dapa or vehicle for another 12 weeks. C57BL/6J mice fed with a standard chow diet (CD) were used as the control group. Metabolic outcomes, liver pathology, lipidomics and insulin signaling were assessed.ResultsWe showed that Dapa reduced body weight and ameliorated hyperglycemia and fatty liver in obese diabetic ob/ob mice. Compared with vehicle, dapa improved the NAFLD activity score mainly by attenuating fat deposition. Importantly, Dapa decreased the expression levels of mRNAs and proteins related to fatty acid synthesis and increased the expression levels of beta-oxidation-related factors. We also found that Dapa treatment improved insulin signaling by increasing PI3K and Akt phosphorylation.ConclusionsDapa protects mice from diet-induced weight gain and improves hepatic lipotoxicity and insulin resistance in diabetic MASLD mice. Our results revealed that Dapa has a therapeutic effect on MASLD and could be a potential drug candidate for the treatment of MASLD.