Abstract:
BACKGROUND:Associations between vitamin D status and childhood asthma are increasingly reported, but direct causation and mechanisms underlying an effect remain unknown. We investigated the effect of early-life vitamin D deficiency on the development of murine neonatal allergic airways disease (AAD). METHODS:In utero and early-life vitamin D deficiency was achieved using a vitamin D-deficient diet for female mice during the third trimester of pregnancy and lactation. Offspring were weaned onto a vitamin D-deficient or vitamin D-replete diet, and exposure to intranasal house dust mite (HDM) or saline was commenced from day 3 of life for up to 6 weeks, when airway hyper-responsiveness (AHR), airway inflammation and remodelling were assessed. RESULTS:Neonatal mice that had in utero and early-life vitamin D deficiency had significantly increased pulmonary CD3(+) CD4(+) T1ST2(+) cells and reduced CD4(+) IL-10(+) cells. This effect was enhanced following HDM exposure. AHR in HDM-exposed mice was unaffected by vitamin D status. Introduction of vitamin D into the diet at weaning resulted in a significant reduction in serum IgE levels, reduced pulmonary eosinophilia and peri-bronchiolar collagen deposition. CONCLUSION:Peri-natal vitamin D deficiency alone has immunomodulatory effects including Th2 skewing and reduced IL-10-secreting T regulatory cells, exaggerated with additional allergen exposure. Vitamin D deficiency in early life does not affect AHR, but contributes to disease severity with worse eosinophilic inflammation and airway remodelling. Importantly, supplementation with vitamin D improves both of these pathological abnormalities.
journal_name
Allergyjournal_title
Allergyauthors
Vasiliou JE,Lui S,Walker SA,Chohan V,Xystrakis E,Bush A,Hawrylowicz CM,Saglani S,Lloyd CMdoi
10.1111/all.12465subject
Has Abstractpub_date
2014-10-01 00:00:00pages
1380-9issue
10eissn
0105-4538issn
1398-9995journal_volume
69pub_type
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