Abstract
Introduction Diabetic retinopathy (DR) is a microvascular ailment that can arise from the long-term effects of diabetes mellitus. It can potentially cause retinal damage that could endanger vision and cause blindness. The worsening of DR is mainly linked to poor glycemic control, uncontrolled hypertension, and dyslipidemia. There is a need for alternative and clinically significant novel molecules involved in the pathogenesis of DR because the diagnostic and prognostic markers have reached a limit. Materials and method This study included sex and age-matched diabetic patients with proliferative stage (N = 70), non-proliferative stage (N = 80), and control (N = 80, without the sign of DR). These patients were recruited from outpatients in the Department of Ophthalmology, Sri Ramachandra Institute of Higher Education and Research, Chennai, India. A random blood sample was collected from each study participant, and the serum was separated after centrifugation and stored at -80 °C for batch analysis. The biomarkers vascular endothelial growth factor (VEGF-A) and angiopoietin-like protein-2 (ANGPTL2) were measured using a sandwich enzyme-linked immunosorbent assay (ELISA) technique, and the laboratory parameters such as fasting blood sugar (FBS), lipid profile, blood urea nitrogen (BUN), creatine, and glycated hemoglobin (HbA1C) were also assessed. Results We observed statistically significant differences in the duration of diabetes, FBS, total cholesterol (TC), triglyceride level (TGL), BUN, and creatine (p<0.05), and the mean age of study participants was 52.95±8.20 years in the control group, 53.85±10.20 years in the proliferative diabetic retinopathy (PDR) group, and 55.02±7.65 in the non-proliferative diabetic retinopathy (NPDR) group. Furthermore, ANGPTL2 levels were statistically significant according to the severity of the disease (p<0.001*), and they were also linked (p<0.05) with established markers such as VEGF-A. Conclusion Thus, our research implies that the up-regulated markers might be linked to the disease's advancement and could serve as a prognostic indicator or therapeutic target for DR.