Cardiac GLO-I activity (a), mRNA expression (b) and protein levels (c) in control (C) and diabetic rats (D). Cardiac GLO-I overexpression was confirmed in the diabetic GLO-1 transgenic rats (DG) by making use of immunohistochemistry (d) and determining GLO-I enzyme activity (e). Cardiac levels of MGO (f), GO (g), 3-deoxyglucosone (3-DG) (h), Nɛ-(1-carboxymethyl)lysine (CML) (i) and Nɛ-(1-carboxyethyl)lysine (CEL) (j) in the three groups were measured by UPLC-MSMS. *p < 0.05 compared with control group, **p < 0.01 compared with control group, ***p < 0.001 compared with control group, and ###p < 0.001 compared with diabetes group.