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The half-life of 25(OH)D after UVB exposure depends on gender and vitamin D receptor polymorphism but mainly on the start level

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Abstract

The 25-hydroxy vitamin D (25(OH)D) production caused by UVB exposure is usually underestimated as the concurrent degradation of 25(OH)D is not considered. Therefore, the decrease in 25(OH)D was investigated during a 7-week period in winter when ambient UVB is negligible. Twenty-two healthy Danish individuals (113 samples) participated and had a mean and steady maximal 25(OH)D start level of 132 nmol l−1 (range of 68–216 nmol l−1) due to long-term UVB treatment prior to this study. In this group with high 25(OH)D start levels, the decrease in 25(OH)D was best described by an exponential model. This suggests a quantitatively larger elimination of 25(OH)D at high 25(OH)D start levels. A linear model (logarithm of 25(OH)D) including personal start levels as intercepts and a slope influenced by gender and the vitamin D receptor gene polymorphism rs2228570 explained 87.8% of the observed variation. The mean half-life was 89 days with a difference in half-life of 120 days between a male with rs2228570 genotype GG (59 days) and a female with rs2228570 genotype AA/AG (179 days). Thus, these two parameters explained a large part of the observed inter-individual variation of 25(OH)D. Furthermore, the decrease was analysed in two groups with medium and low 25(OH)D start levels resulting in longer half-lives of 149 days and 199 days, respectively. The longer half-lives at lower 25(OH)D levels may be caused by storage mobilisation, changed catabolism or increased intestinal absorption.

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Authors and Affiliations

  1. Department of Dermatology, Copenhagen University Hospital, Bispebjerg Hospital, Bispebjerg Bakke 23, 2400, Copenhagen NV, Denmark

    Pameli Datta, Peter A. Philipsen, Peter Olsen, Morten K. Bogh & Hans C. Wulf

  2. Section of Forensic Genetics, Department of Forensic Medicine, Faculty of Health and Medical Sciences, University of Copenhagen, Frederik V’s Vej 11, 2100, Copenhagen, Denmark

    Peter Johansen & Niels Morling

  3. Department of Clinical Immunology and Biochemistry, Lillebaelt Hospital, Kabbeltoft 25, 7100, Vejle, Denmark

    Anne V. Schmedes

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Datta, P., Philipsen, P.A., Olsen, P. et al. The half-life of 25(OH)D after UVB exposure depends on gender and vitamin D receptor polymorphism but mainly on the start level. Photochem Photobiol Sci 16, 985–995 (2017). https://doi.org/10.1039/c6pp00258g

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