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Osteoporosis International

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Open Access 01-03-2015 | Original Article

Predictors of 25(OH)D half-life and plasma 25(OH)D concentration in The Gambia and the UK

Authors: K. S. Jones, S. Assar, D. Vanderschueren, R. Bouillon, A. Prentice, I. Schoenmakers

Published in: Osteoporosis International | Issue 3/2015

Abstract

Summary

Predictors of 25(OH)D₃ half-life were factors associated with vitamin D metabolism, but were different between people in The Gambia and the UK. Country was the strongest predictor of plasma 25(OH)D concentration, probably as a marker of UVB exposure. 25(OH)D₃ half-life may be applied as a tool to investigate vitamin D expenditure.

Introduction

The aim of this study was to investigate predictors of 25(OH)D₃ half-life and plasma 25(OH)D concentration.

Methods

Plasma half-life of an oral tracer dose of deuterated-25(OH)D₃ was measured in healthy men aged 24–39 years, resident in The Gambia, West Africa (n = 18) and in the UK during the winter (n = 18), countries that differ in calcium intake and vitamin D status. Plasma and urinary markers of vitamin D, calcium, phosphate and bone metabolism, nutrient intakes and anthropometry were measured.

Results

Normally distributed data are presented as mean (SD) and non-normal data as geometric mean (95 % CI). Gambian compared to UK men had higher plasma concentrations of 25(OH)D (69 (13) vs. 29 (11) nmol/L; P < 0.0001); 1,25(OH)₂D (181 (165, 197) vs. 120 (109, 132) pmol/L; P < 0.01); and parathyroid hormone (PTH) (50 (42, 60) vs. 33 (27, 39); P < 0.0001). There was no difference in 25(OH)D₃ half-life (14.7 (3.5) days vs. 15.6 (2.5) days) between countries (P = 0.2). In multivariate analyses, 25(OH)D, 1,25(OH)₂D, vitamin D binding protein and albumin-adjusted calcium (Ca_alb) explained 79 % of variance in 25(OH)D₃ half-life in Gambians, but no significant predictors were found in UK participants. For the countries combined, Ca_alb, PTH and plasma phosphate explained 39 % of half-life variability. 1,25(OH)₂D, weight, PTH and country explained 81 % of variability in 25(OH)D concentration; however, country alone explained 74 %.

Conclusion

Factors known to affect 25(OH)D metabolism predict 25(OH)D₃ half-life, but these differed between countries. Country predicted 25(OH)D, probably as a proxy measure for UVB exposure and vitamin D supply. This study supports the use of 25(OH)D half-life to investigate vitamin D metabolism.

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Title: Predictors of 25(OH)D half-life and plasma 25(OH)D concentration in The Gambia and the UK
Authors: K. S. Jones
S. Assar
D. Vanderschueren
R. Bouillon
A. Prentice
I. Schoenmakers
Publication date: 01-03-2015
Publisher: Springer London
Published in: Osteoporosis International / Issue 3/2015
Print ISSN: 0937-941X
Electronic ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-014-2905-0

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Predictors of 25(OH)D half-life and plasma 25(OH)D concentration in The Gambia and the UK

Abstract

Summary

Introduction

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Summary

Introduction

Methods

Results

Conclusion

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