DPP4 and metabolic dysfunction-associated steatotic liver disease: Moreover, DPP4 demethylation increases DPP4 expression early in life.172 Resveratrol (trans-3,5,4′-trihydroxystilbene), an inhibitor of glucose transporter 9 (GLUT9), regulates the methylation levels of NF-E2-related factor 2 (Nrf2) gene promoter to affect the development of NAFLD.