Tehran University of Medical Sciences Acta Biochimica Iranica 0001-5261 1 4 2023 12 20 183 188 Amirhossein Sangdari Department of Clinical Biochemistry, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran Amir Karbalaee-Hasani Department of Clinical Biochemistry, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran Mojtaba Fathi Department of Biochemistry and Genetics, Qazvin University of Medical Sciences, Qazvin, Iran. Hadi Khodabandehloo Department of Clinical Biochemistry, School of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran 2024 01 01 Objectives: Advanced glycation end products (AGEs) play an important role in the development and progression of diabetic complications. The receptor for AGE (RAGE) is the ligand-binding site of AGE that initiates and accelerates the atherosclerotic process. Plasminogen activator inhibitor-1 (PAI-1) is a prothrombotic factor that has been proposed as a biological marker for prognostic assessment, monitoring of microvascular and macrovascular complications in diabetes. The purpose of this study is to investigate the effects of aminoguanidine on RAGE and PAI-1 expression levels in the liver of streptozotocin-induced diabetic rats. Methods: Diabetes was induced in rats by intraperitoneal injection of streptozocin (STZ, 50 mg/kg). On day 3, diabetic rats were administered 50, 100, and 200 mg/kg/day of aminoguanidine. The expression of PAI-1 and RAGE in the liver tissue was evaluated using real-time PCR. Results: PAI-1 and RAGE gene expression levels were higher in the liver of the diabetic rats compared to the control group. Aminoguanidine at 50, 100, and 200 mg/kg decreased PAI-1 and RAGE gene expression in the liver (p<0.001 at all doses). However, these genes were downregulated only at a dose of 200 mg/kg in healthy rats (p<0.0001). In addition, hepatic AGE protein levels were significantly decreased following treatment of the diabetic rats with aminoguanidine (p<0.001). There was also a significant correlation between AGE protein concentration and the expression of PAI-1 and RAGE. Conclusion: In summary, the data of the present study suggest that aminoguanidine reduced the expression of PAI-1 and RAGE in the liver of the diabetic rats. https://abi.tums.ac.ir/index.php/abi/article/view/68 https://abi.tums.ac.ir/index.php/abi/article/download/68/33