P1037EFFECT OF VITAMIN D SUPPLEMENTATION ON PROTEINURIA, LIPID STATUS, GLICOREGULATION, C-REACTIVE PROTEIN, VEGF-A, TGF-BETA1 AND NEPHRIN IN PATIENTS WITH TYPE 2 DIABETES MELLITUS

Abstract

Abstract Background and Aims: Vitamin D insufficiency/deficiency is often present in patients with Type-2 diabetes mellitus and could present a risk factor for rapid progression of diabetic nephropathy and higher incidence of cardiovascular events. The aim of this study was to examine the influence of vitamin D supplementation on glucoregulation, inflammation, cholesterol, triglycerides, albuminuria and biomarkers of renal injury – nephrin, VEGF-A and TGF- β1 in patients with Type-2 diabetes mellitus and vitamin D insufficiency/deficiency. Method: We included 90 patients with Type-2 diabetes mellitus and vitamin D insufficiency/deficiency in this prospective, cohort study. Patients are divided in 3 equal groups: 30 patients with normal albuminuria, 30 with microalbuminuria and 30 with macroalbuminuria. Therapy included 6 months of supplementation with cholecalciferol drops: first 2 months with 20000 IU twice weekly, than if vitamin D level remained below normal range, we procedeed with same dose next 4 months. If the level of vitamin D normalized, we proceeded with 5000 IU twice weekly. At the beginning and at the end of the study we measured levels of albumin, hemoglobin, serum iron, urea, creatinine, fasting blood glucose, hemoglobin A1c, calcium, phosphorus, total cholesterol, triglycerides, C-reactive protein, intact parathyroid hormone, and urine analysis: 24-hour urine protein, albumin/creatinine ratio and creatinine clearance. Biomarkers are measured in serum and urine. Levels of calcium, phosphorus and vitamin D are also checked 2 months after beginning of therapy due to possible correction of cholecalciferol dose. Results are analysed according to the vitamin D level at the beginning and at the end of the study. Results: The lowest level of vitamin D, before therapy, is found in patients with macroalbuminuria, while at the end of the study we found significantly higher level of vitamin D in all three groups. After 6 months of therapy we found significant decrease of 24-hour urine protein, total cholesterol, triglycerides, hemoglobin A1c and VEGF-A in urine, in all three groups, and C-reactive protein in patients with normal albuminuria and microalbuminuria, nephrin in urine in patients with microalbuminuria and TGF- β1 in urine in patients with macroalbuminuria. Conclusion: vitamin D supplementation with high-dose cholecalciferol in patients with Type-2 diabetes mellitus (with or without albuminuria) decreases C-reactive protein, hemoglobin A1c, total cholesterol, triglycerides in serum, and albumin/creatinine ratio, 24-hour urine protein, VEGF-A, TGF- β1 and nephrin in urine.