Role of vitamin D in oxidative stress modulation in end‐stage renal disease patients: A double‐blind randomized clinical trial

Abstract

Introduction Oxidative stress is considered as important actor in uremia‐associated morbidity and mortality in hemodialysis (HD) patients. We aimed to evaluate the role of vitamin D supplementation on oxidative stress parameters in this group. Methods This double‐blind randomized clinical trial was conducted on HD patients who were randomly allocated into intervention (n = 40) or control groups (n = 38) for 10 weeks. Blood samples were taken before and at the end of the trial to measure serum 25‐hydroxyvitamin D (25(OH)D), malondialdehyde (MDA), glutathione peroxidase (GPx), catalase (CAT), and superoxide dismutase (SOD). Data were analyzed using SPSS, and P value <0.05 was considered to be statistically significant. Findings Out of the 78 patients with a mean age of 44.7 ± 13.0 years, 55.1% were men. At the commencement of the study, there was no difference with respect to serum 25(OH)D levels in our groups (P = 0.575), but during the study it was significantly elevated in the intervention group (18.1 ± 9.1 vs. 31.7 ± 12.9, P < 0.0001). Serum antioxidative enzymes activity (GPx, CAT, and SOD) had significantly increased after vitamin D supplementation in the intervention group (P < 0.05). Furthermore, MDA levels was significantly reduced only in the intervention group (31.7 ± 18.0 vs. 24.7 ± 7.7, P = 0.018). Discussion Regular consumption of vitamin D can increase the GPx, CAT, SOD, and reduce the MDA plasma levels in HD patients. Since no adverse effects of vitamin D supplementation was reported by the patients; hence, it can be prescribed for HD patients.

NUTRARET: Effect of 2-Year Nutraceutical Supplementation on Redox Status and Visual Function of Patients With Retinitis Pigmentosa: A Randomized, Double-Blind, Placebo-Controlled Trial

“…For instance, supplementation with saffron or ellagic acid, a polyphenol, improved systemic antioxidant response (TAC, SOD, and GPx activities) in patients with ulcerative colitis or with type 2 diabetes, respectively ( 88 , 89 ). Vitamin D or alpha lipoic acid supplementation increased antioxidant response (SOD and/or GPx, CAT activities) and reduced oxidative damage (MDA) in hemodialysis patients ( 90 , 91 ).…”