scholarly journals The effect of vitamin D supplementation on plasma non-oxidised PTH in a randomised clinical trial

2019 ◽  
Vol 8 (5) ◽  
pp. 518-527 ◽  
Author(s):  
Stan Ursem ◽  
Vito Francic ◽  
Martin Keppel ◽  
Verena Schwetz ◽  
Christian Trummer ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Clinical Trial ◽  
Vitamin D ◽  
Lipid Metabolism ◽  
Randomised Clinical Trial ◽  
Vitamin D Supplementation ◽  
Hormonal Status ◽  
Hypertensive Patients ◽  
And Oxidative Stress

Objective PTH can be oxidised in vivo, rendering it biologically inactive. Non-oxidised PTH (n-oxPTH) may therefore give a better image of the hormonal status of the patient. While vitamin D supplementation decreases total PTH (tPTH) concentration, the effect on n-oxPTH concentration is unexplored. We investigated the effect of vitamin D on n-oxPTH concentration in comparison to tPTH and compared the correlations between parameters of calcium, bone and lipid metabolism with n-oxPTH and tPTH. Methods N-oxPTH was measured in 108 vitamin D-insufficient (25(OH)D <75 nmol/L) hypertensive patients, treated with vitamin D (2800 IE daily) or placebo for 8 weeks in the Styrian Vitamin D Hypertension Trial (NCT02136771). We calculated the treatment effect and performed correlation analyses of n-oxPTH and tPTH with parameters of calcium, bone and lipid metabolism and oxidative stress. Results After treatment, compared to placebo, 25(OH)D concentrations increased, tPTH decreased by 9% (P < 0.001), n-oxPTH by 7% (P = 0.025) and the ratio of n-oxPTH/tPTH increased (P = 0.027). Changes in phosphate and HDL concentration correlated with changes in n-oxPTH, but not tPTH. Conclusions tPTH and n-oxPTH decrease upon vitamin D supplementation. Our study suggests that vitamin D supplementation reduces the oxidation of PTH, as we observed a small but significant increase in the non-oxidised proportion of PTH upon treatment. In addition, we found that changes in phosphate and HDL concentration showed a relationship with changes in n-oxPTH, but not tPTH. This may be explained by the biological activity of n-oxPTH. Further research should be carried out to establish the clinical relevance of n-oxPTH.

Clinical Trial on the Effects of Vitamin D Supplementation on Metabolic Profiles in Diabetic Hemodialysis

2017 ◽  
Vol 50 (01) ◽  
pp. 50-55 ◽  
Author(s):  
Mohammad Tamadon ◽  
Alireza Soleimani ◽  
Fariba Keneshlou ◽  
Malihe Mojarrad ◽  
Fereshteh Bahmani ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Clinical Trial ◽  
Vitamin D ◽  
Serum Insulin ◽  
Vitamin D Supplementation ◽  
Controlled Clinical Trial ◽  
Double Blind ◽  
Insulin Metabolism ◽  
Hs Crp ◽  
And Oxidative Stress

AbstractThe current study was conducted to assess the effects of vitamin D supplementation on insulin metabolism, lipid fractions, biomarkers of inflammation, and oxidative stress in diabetic hemodialysis (HD) patients. This randomized double-blind placebo-controlled clinical trial was carried out among 60 diabetic HD patients. Subjects were randomly allocated into two groups to intake either oral vitamin D3 supplements at a dosage of 50 000 IU (n=30) or placebo (n=30) every 2 weeks for 12 weeks. After 12 weeks of intervention, subjects who received vitamin D supplements compared with the placebo had significantly decreased serum insulin concentrations (–3.4±3.7 vs. +2.0±4.2 μIU/ml, p<0.001), homeostasis model of assessment-estimated insulin resistance (HOMA-IR) (–1.2±1.8 vs. +0.9±2.3, p<0.001), and improved quantitative insulin sensitivity check index (QUICKI) (+0.02±0.03 vs. –0.01±0.02, p<0.001). In addition, compared with the placebo, vitamin D supplementation led to significant reductions in serum high-sensitivity C-reactive protein (hs-CRP) (–1.4±2.5 vs. +1.4±4.8 mg/l, p=0.007), plasma malondialdehyde (MDA) (–0.1±0.2 vs. +0.1±0.2 μmol/l, p=0.009) and a significant increase in plasma total antioxidant capacity (TAC) concentrations (+33.8±56.7 vs. –2.0±74.5 mmol/l, p=0.04). We did not see any significant effect of vitamin D supplementation on lipid profiles and other biomarkers of inflammation and oxidative stress compared with the placebo. Overall, we found that vitamin D supplementation had beneficial effects on serum insulin, HOMA-IR, QUICKI, serum hs-CRP, plasma MDA, and TAC levels among diabetic HD patients for 12 weeks. Clinical registration: http://www.irct.ir: IRCT201611155623N92.

scholarly journals Effect of Vitamin D Supplementation on Faecal Microbiota: A Randomised Clinical Trial

Nutrients ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2888 ◽  
Author(s):  
Negar Naderpoor ◽  
Aya Mousa ◽  
Luisa Fernanda Gomez Arango ◽  
Helen L. Barrett ◽  
Marloes Dekker Nitert ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Vitamin D ◽  
Gut Microbiota ◽  
Randomised Clinical Trial ◽  
Vitamin D Supplementation ◽  
Faecal Microbiota ◽  
Lower Abundance ◽  
Α Diversity ◽  
Significant Difference

In animal studies, vitamin D supplementation has been shown to improve gut microbiota and intestinal inflammation. However, limited evidence exists on the effect of vitamin D supplementation on the human gut microbiota. We examined the effect of vitamin D supplementation on faecal microbiota in 26 vitamin D-deficient (25-hydroxyvitamin D (25(OH)D) ≤50 nmol/L), overweight or obese (BMI ≥25 kg/m2) otherwise healthy adults. Our study was ancillary to a community based double-blind randomised clinical trial, conducted between 2014 and 2016. The participants provided stool samples at baseline and after 100,000 international units (IU) loading dose of cholecalciferol followed by 4000 IU daily or matching placebo for 16 weeks. Faecal microbiota was analysed using 16S rRNA sequencing; V6–8 region. There was no significant difference in microbiome α-diversity between vitamin D and placebo groups at baseline and follow-up (all p > 0.05). In addition, no clustering was found based on vitamin D supplementation at follow-up (p = 0.3). However, there was a significant association between community composition and vitamin D supplementation at the genus level (p = 0.04). The vitamin D group had a higher abundance of genus Lachnospira, and lower abundance of genus Blautia (linear discriminate analysis >3.0). Moreover, individuals with 25(OH)D >75 nmol/L had a higher abundance of genus Coprococcus and lower abundance of genus Ruminococcus compared to those with 25(OH)D <50 nmol/L. Our findings suggest that vitamin D supplementation has some distinct effects on faecal microbiota. Future studies need to explore whether these effects would translate into improved clinical outcomes.

scholarly journals Effect of Vitamin D supplementation on vascular functions and oxidative stress in type 2 diabetic patients with Vitamin D deficiency

2017 ◽  
Vol 21 (4) ◽  
pp. 555 ◽  
Author(s):  
Sandhiya Selvarajan ◽  
Nishanthi Anandabaskar ◽  
StevenAibor Dkhar ◽  
SadishKumar Kamalanathan ◽  
Kadhiravan Tamilarasu ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Vitamin D ◽  
Vitamin D Deficiency ◽  
Vitamin D Supplementation ◽  
Diabetic Patients ◽  
Type 2 Diabetic Patients ◽  
And Oxidative Stress ◽  
Type 2 Diabetic
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