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Vitamin D and Immunity in Infants and Children

by Geneviève Mailhot 1,2,* and John H. White 3,4,*
1
Department of Nutrition, University of Montreal, Montreal, QC H3T 1A8, Canada
2
Centre Hospitalier Universitaire Sainte-Justine, Montreal, QC H3T 1C5, Canada
3
Department of Physiology, McGill University, Montreal, QC H3G 1Y6, Canada
4
Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada
*
Authors to whom correspondence should be addressed.
Nutrients 2020, 12(5), 1233; https://doi.org/10.3390/nu12051233
Received: 8 April 2020 / Revised: 24 April 2020 / Accepted: 25 April 2020 / Published: 27 April 2020
(This article belongs to the Special Issue Vitamin D on Immune Function)
The last couple of decades have seen an explosion in our interest and understanding of the role of vitamin D in the regulation of immunity. At the molecular level, the hormonal form of vitamin D signals through the nuclear vitamin D receptor (VDR), a ligand-regulated transcription factor. The VDR and vitamin D metabolic enzymes are expressed throughout the innate and adaptive arms of the immune system. The advent of genome-wide approaches to gene expression profiling have led to the identification of numerous VDR-regulated genes implicated in the regulation of innate and adaptive immunity. The molecular data infer that vitamin D signaling should boost innate immunity against pathogens of bacterial or viral origin. Vitamin D signaling also suppresses inflammatory immune responses that underlie autoimmunity and regulate allergic responses. These findings have been bolstered by clinical studies linking vitamin D deficiency to increased rates of infections, autoimmunity, and allergies. Our goals here are to provide an overview of the molecular basis for immune system regulation and to survey the clinical data from pediatric populations, using randomized placebo-controlled trials and meta-analyses where possible, linking vitamin D deficiency to increased rates of infections, autoimmune conditions, and allergies, and addressing the impact of supplementation on these conditions. View Full-Text
Keywords: vitamin D deficiency; pediatric populations; innate immunity; infectious diseases; autoimmunity; allergies vitamin D deficiency; pediatric populations; innate immunity; infectious diseases; autoimmunity; allergies
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Mailhot, G.; White, J.H. Vitamin D and Immunity in Infants and Children. Nutrients 2020, 12, 1233.

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