Biochemical efficacy of vitamin D in ameliorating endocrine and metabolic disorders in diabetic rats

Context: Due to the biochemical role of vitamin D (Vit D) in the endocrine system, especially its potential anti-inflammatory and immune-modulating properties, there is an increased interest in its potential role in the prevention and control of diabetes mellitus. Objective: This study evaluated the potential therapeutic efficacy of Vit D in averting the detrimental effects of both types of diabetes mellitus. Materials and methods: A total of 50 male Wistar rats were allotted into five groups: a placebo group; a nongenetic model of type 1 diabetes in rats (T1D), injected with a single dose of streptozotocin (STZ; 65 mg/kg, ip); a nongenetic model of type 2 diabetes in rats (T2D), given a short-term high-fat diet followed by a single low dose of STZ (35 mg/kg, ip); fourth and fifth groups that were gastrogavaged with Vit D (10 IU/kg) three days after the induction of T1D and T2D, respectively, which was continued daily throughout the experiment. Results: Vit D (10 IU/kg/60 days) significantly (p<50.05) decreased fasting plasma glucose, ketoacidosis (decreased non-esterified fatty acid and b-hydroxyl butyric acid), pro-inflammatory interleukin-6, HbA1c in T1D and T2D and insulin resistance index by 33% in T2D. Interestingly, Vit D significantly (p<50.05) increased fasting plasma insulin by 144% in T1D, plasma Ca level, insulin sensitivity index, and beta-cell function index in T1D and T2D. Discussion and conclusion: Vit D ameliorated the deleterious biochemical impact of diabetes mellitus, likely by increasing insulin secretion and sensitivity, ameliorating the beta-cell function, and decreasing the number of pro-inflammatory cytokines and insulin resistance.