YU Ling, DUAN Cheng-hui, YANG Yang, et al.
Objective: Exploring the effects of glucagon-like peptide-1 receptor agonist (GLP-1RA) on hepatic tissue lesions and oxidative stress damage in rats with type 2 diabetes mellitus (T2DM) complicated by non-alcoholic fatty liver disease (NAFLD). Methods: Six SD rats were maintained under normal conditions as the control group. A T2DM combined with NAFLD model was established by feeding SD rats a high-fat diet and administering streptozotocin. After successful modeling, the rats were randomly divided into the model group and the GLP-1RA group, with six rats in each group. The control and model groups received intraperitoneal injections of saline, while the GLP-1RA group received intraperitoneal injections of GLP-1RA for treatment. After four weeks, general conditions of the rats were observed, and their body weight, liver wet weight, liver index, and biochemical markers were measured[blood glucose (GLU), glycated serum protein (GSP), total cholesterol (TC), triglycerides (TG), and alanine aminotransferase (ALT)] levels were detected. HE and Oil Red O staining were respectively applied to measure the pathological morphology and steatosis of liver tissue. Reagent kits were applied to detect the levels of oxidative stress indicators [superoxide dismutase (SOD) and malondialdehyde (MDA)] in rat liver tissue. Results: Compared with the control group, the model group showed obvious pathological damage and steatosis in the liver tissue of rats, the body weight, liver wet weight, liver index, GLU, GSP, TC, TG and ALT levels, NFALD activity score, and liver tissue MDA level obviously increased (P<0.05), the SOD level in liver tissue obviously decreased (P<0.05). Compared with the model group, the GLP-1RA group showed a reduction in liver tissue pathological damage and steatosis in rats, the body weight, liver wet weight, liver index, GLU, GSP, TC, TG and ALT levels, NFALD activity score, and liver tissue MDA level decreased (P<0.05), the SOD level in liver tissue increased (P<0.05). Conclusion: GLP-1RA can improve glucose and lipid metabolism, antagonize oxidative stress, reduce intracellular lipid deposition in liver cells, alleviate liver tissue lesions and oxidative stress damage in T2DM combined with NAFLD rats, protect liver function, and delay the progression of NAFLD.