Title: Decreased anti-inflammatory responses to vitamin D in neonatal neutrophils.

Authors: Hirsch, Daniel; Archer, Faith E; Joshi-Kale, Meera; Vetrano, Anna M; Weinberger, Barry

Published In Mediators Inflamm, (2011)

Abstract: Neutrophil activity is prolonged in newborns, suggesting decreased exposure and/or responses to immunosuppressive modulators, such as 1,25-hydroxyvitamin D(3) (1,25-vit D(3)). We hypothesized that 1,25-vit D(3) suppresses neutrophil activation and that this response is impaired in newborns. Consistent with this, 1,25-vit D(3) decreased LPS-induced expression of macrophage inflammatory protein-1ýý and VEGF in adult, but not neonatal, neutrophils. Expression of vitamin D receptor (VDR) and 25-hydroxyvitamin D(3)-1ýý-hydroxylase was reduced in neonatal, relative to adult neutrophils. Moreover, 1,25-vit D(3) induced VDR gene expression in activated adult, but not neonatal, neutrophils. 1,25-vit D(3) also suppressed expression of cyclooxygenase-2 and induced expression of 5-lipoxygenase in LPS-exposed adult neutrophils, while neonatal cells were not affected. 1,25-vit D(3) had no effect on respiratory burst in either adult or neonatal cells. Anti-inflammatory activity of vitamin D is impaired in neonatal neutrophils, and this may be due to decreased expression of VDR and 1ýý-hydroxylase. Insensitivity to 1,25-vit D(3) may contribute to chronic inflammation in neonates.

PubMed ID: 22219556

MeSH Terms: No MeSH terms associated with this publication