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The effect of vitamin D on renin-angiotensin system activation and blood pressure: a randomized control trial.

Abstract：

OBJECTIVE:Disruption of vitamin D signaling in rodents causes activation of the rennin-angiotensin system (RAS) and development of hypertension. Observational studies in humans found lower circulating 25-hydroxyvitamin D [25(OH)D] is associated with increased RAS activity and blood pressure (BP). We performed the first randomized control trial to investigate the effects of vitamin D supplementation on the RAS in humans. METHODS:Vitamin D deficient, [25(OH)D ≤20 ng/ml), overweight individuals without hypertension were randomized into a double-blind, placebo-controlled trial of 8-weeks treatment with ergocalciferol or placebo. Kidney-specific RAS activity, measured using renal plasma flow response to captopril in high sodium balance, was assessed at baseline and 8 weeks, as was systemic RAS activity and 24-h ambulatory BP. RESULTS:In total, 84 participants completed the study. Mean 25[OH]D levels increased from 14.7 to 30.3 ng/ml in the ergocalciferol group, P value < 0.0001, and from 14.3 to 17.4 ng/ml in the placebo group, P value = 0.3. The renal plasma flow response to captopril was 33.9 ± 56.1 ml/min per 1.73 m at baseline and 35.7 ± 47.7 ml/min per 1.73 m at 8 weeks in the ergocalciferol group (P value = 0.83); and was 37.3 ± 46.9 ml/min per 1.73 m at baseline and 35.9 ± 26.2 ml/min per 1.73 m at 8 weeks in the placebo group (P value = 0.78). Ergocalciferol had no effect on PRA, AngII, or 24-h BP measurements. CONCLUSIONS:This trial found no benefit from correcting vitamin D deficiency on RAS activity or BP after 8 weeks. These findings are not consistent with the hypothesis that vitamin D is a modifiable target for lowering BP in vitamin D deficient individuals.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

McMullan CJ,Borgi L,Curhan GC,Fisher N,Forman JP

doi

10.1097/HJH.0000000000001220

subject

Has Abstract

pub_date

2017-04-01 00:00:00

pages

822-829

issue

4

eissn

0263-6352

issn

1473-5598

journal_volume

35

pub_type

杂志文章,随机对照试验

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