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Winter cholecalciferol supplementation at 55°N has little effect on markers of innate immune defense in healthy children aged 4–8 years: a secondary analysis from a randomized controlled trial

  • Hanne Hauger
  • Christian Ritz
  • Charlotte Mortensen
  • Christian Mølgaard
  • Stine Broeng Metzdorff
  • Hanne Frøkiær
  • Camilla Trab Damsgaard
Original Contribution

Abstract

Purpose

We explored the effect of winter cholecalciferol (vitamin D3) supplementation on innate immune markers in healthy Danish children (55°N).

Methods

In the double-blind, placebo-controlled trial, ODIN Junior, 119 healthy, white, 4–8 year-olds were randomized to 0 (placebo), 10 or 20 µg/day of vitamin D3 for 20 weeks (October–March). Cheek mucosal swabs, blood samples, and questionnaires on acute respiratory infections the previous month were collected at baseline and endpoint. Innate immune markers were measured as secondary outcomes including in vivo oral mucosal gene expression of calprotectin (S100A9), lipocalin-2 (LCN2), beta-defensin-4 (DEFB4), interleukin-8 (IL-8), viperin (RSAD2), and the cathelicidin-antimicrobial-peptide (CAMP); ex vivo whole-blood lipopolysaccharide (LPS)-induced cathelicidin, IL-8, and IL-6; and plasma cathelicidin, together with serum 25-hydroxyvitamin D [25(OH)D].

Results

Serum 25(OH)D was 56.7 ± 12.3 nmol/L at baseline and 31.1 ± 7.5, 61.8 ± 10.6, and 75.8 ± 11.5 nmol/L at endpoint after placebo, 10 and 20 µg/day of vitamin D3 (P < 0.0001), respectively. A decreased oral mucosal S100A9 expression with placebo [− 18 (95% CI − 1; − 32)%] was marginally avoided with 20 µg/day [6 (− 13; 28)%] (P = 0.06). Likewise, a decreased LPS-induced IL-8 with placebo [− 438 (95% CI − 693; − 184) ng/L] was marginally avoided with 20 µg/day [− 109 (− 374; 157) ng/L] (P = 0.07). All other immune markers and respiratory infection episodes were unaffected by vitamin D3 supplementation (all P > 0.11).

Conclusions

Winter vitamin D3 supplementation of 10 µg/day did not affect innate immune markers, whereas 20 µg/day tended to maintain the capacity to produce a few markers in healthy children.

Keywords

Randomized controlled trial Vitamin D Children Innate immune function Antimicrobial peptides Cytokines 

Abbreviations

ACTB

Beta-actin

CAMP

Cathelicidin-antimicrobial-peptide

Cq

Quantification cycle

CRP

C-reactive protein

CYP27B1

Cytochrome P450 family 27 subfamily B member 1 (1α-hydroxylase)

DEFB4

Beta-defensin-4

HPRT1

Hypoxanthine phosphoribosyltransferase 1

IL-6

Interleukin-6

IL-8

Interleukin-8

LCN2

Lipocalin-2

ODIN

Food-based solutions for optimal vitamin D nutrition and health through the life cycle

RSAD2

Radical S-adenosyl methionine domain-containing protein 2 (viperin)

S100A9

S100 calcium-binding protein A9 (calprotectin LH1 subunit)

VDR

Vitamin D receptor

Vitamin D3

Cholecalciferol

1,25(OH)2D

1,25-dihydroxyvitamin D

25(OH)D

25-hydroxyvitamin D

Notes

Acknowledgements

The authors’ responsibilities were as follows—HH, C Mølgaard, HF, and CTD designed the research; HH, C Mortensen, C Mølgaard, SBM, HF, and CTD conducted the research; HH performed the statistical analyses and drafted the manuscript; CR provided statistical guidance; HF and CTD assisted in the manuscript preparation; all authors: read and approved the final manuscript. We thank all the participating children and their parents.

Funding

This project was funded by Lundbeckfonden (R180-2014-3481), by Brødrene Hartmann’s Fund (A26842), and by the European Commission (FP7/2007–2013) under Grant Agreement 613977 for the ODIN Integrated Project (Food-based solutions for optimal vitamin D nutrition and health through the life cycle http://www.odin-vitd.eu/). Minisun vitamin D and placebo tablets were provided by OY Verman Ab.

Compliance with ethical standards

Ethical approval

The study was approved by The Committees on Biomedical Research Ethics for the Capital Region of Denmark (H-3-2014-022) and conducted in accordance with the Declaration of Helsinki [46]. Written informed consent was obtained from all legal guardians of the participating children.

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

394_2018_1671_MOESM1_ESM.docx (44 kb)
Supplementary material 1 (DOCX 44 KB)
394_2018_1671_MOESM2_ESM.docx (50 kb)
Supplementary material 2 (DOCX 50 KB)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Nutrition, Exercise and SportsUniversity of CopenhagenFrederiksberg CDenmark
  2. 2.Department of Veterinary and Animal SciencesUniversity of CopenhagenFrederiksberg CDenmark

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