[Effect of dapagliflozin on gene expression of glucose transporter 2 and glucose transporter 4 in kidney of type 2 diabetic rats].

To investigate the effects of dapagliflozin on the gene expressions of glucose transporter 2 (GLUT2) and glucose transporter 4 (GLUT4) in type 2 diabetic rats. High fat diet and 40 mg/kg streptozotocin (STZ) were used to establish the rat model of type 2 diabetes mellitus. When the fasting blood glucose (FBG) content was more than or equal to 16.7 mmol/L, the model was established successfully. After successful modeling, the rats were randomly divided into model group (group B, normal saline), dapagliflozin low-dose group (Group C, 0.75 mg/kg), dapagliflozin middle dose group (Group D, 1.5 mg/kg) and dapagliflozin high-dose group (Group E, 3.0 mg/kg), with 6 rats in each group. Six healthy SD rats were selected as normal control group (group A, normal saline). Each group was administrated by gavage once a day for 7 weeks. The body weight, serum FBG, hemoglobin A1c (HbA1c), blood urea nitrogen (BUN) and serum creatinine (Scr) were measured after 7 weeks. The levels of malondialdehyde (MDA), superoxide dismutase (SOD) and glutathione peroxidase (GSH-PX) in serum and kidney were measured by enzyme-linked immunosorbent assay (ELISA). HE staining was used to observe the pathological changes of kidney. The protein expressions of GLUT2 and GLUT4 were detected by Western blot. RT-qPCR was used to detect the relative expressions of GLUT2 and GLUT4 mRNA in kidney tissue. Compared with group A, the body weight, SOD, GSH-Px levels of rats in each group were significantly decreased (＜0.05), while the levels of FBG, HbA1c, BUN, SCR and MDA were significantly increased (＜0.05), renal pathological damage was serious, the relative expressions of GLUT2, GLUT4 mRNA and protein in renal tissue were significantly decreased (＜0.05). Compared with group B, the body weight, SOD, GSH-Px levels and the mRNA relative expressions of GLUT2 and GLUT4 in group C, group D and group E were significantly increased (＜0.05), while the levels of FBG, HbA1c, BUN, SCR and MDA were significantly decreased (＜0.05). The renal pathological damage in group D and group E was significantly alleviated, and the expressions of GLUT2 and GLUT4 protein in renal tissue were significantly increased (all ＜0.05). Dapagliflozin can alleviate the condition of type 2 diabetic rats and up regulate the expression of GLUT2 and GLUT4 genes in kidney.