Background And Aims: Monocyte chemoattractant protein-1 (MCP-1) and cathepsin-D are progressively raised in type 2 diabetes mellitus (T2DM) with both non proliferative and proliferative retinal disease. This study aimed to evaluate the effect of antidiabetic medications on MCP-1 and cathepsin-D.
Methods: 60 patients of T2DM without retinopathy and 60 of diabetic retinopathy were enrolled to receive metformin (500 mg-1000 mg) combined with either glimepiride (1 mg-2 mg) or insulin. The effect of antidiabetic medications on serum MCP-1 and cathepsin-D was assessed.
Results: Mean MCP-1 (pg/ml) and cathepsin-D (ng/ml) levels were significantly lower in patients of T2DM with and without retinopathy treated with metformin + insulin (468.52 ± 272.84 vs 234.30 ± 180.58; p < 0.01 and 460.15 ± 128.52 vs 517.33 ± 213.49; p = 0.214) as compared to patients treated with metformin + glimepiride (1434.02 ± 105.27 vs 1256.27 ± 76.76; p < 0.01 and 1689.36 ± 752.57 vs 919.69 ± 675.05; p = < 0.01). No significant correlation of MCP-1 and cathepsin-D with HbA1c, fasting and post prandial blood glucose were found.
Conclusion: Patients treated with metformin and insulin combination had lower serum MCP-1 and cathepsin-D levels which suggests that this combination may be more effective in reducing the progression of diabetic retinopathy. (CTRI/2018/05/013601).
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