Longitudinal trajectory of vitamin D status from birth to early childhood in the development of food sensitization

Liu, X.; Arguelles, L.; Zhou, Y.; Wang, G.; Chen, Q.; Tsai, H. J.; Hong, X.; Liu, R.; Price, H. E.; Pearson, C.; Apollon, S.; Cruz, N.; Schleimer, R.; Langman, C. B.; Pongracic, J. A.; Wang, X.

Pediatr Res. 2013 Jun 26; 74(3):321-6

Abstract

BACKGROUND: Increasing evidence supports the immunomodulatory effect of vitamin D on allergic diseases. The combined role of prenatal and postnatal vitamin D status in the development of food sensitization (FS) and food allergy remains understudied. METHODS: Plasma 25-hydroxyvitamin D (25(OH)D) levels of 460 children in the Boston Birth Cohort (BBC) were measured at birth and early childhood, and the subjects were genotyped for rs2243250 (C-590T) in the IL4 gene. We defined FS as specific IgE levels of >/=0.35 kUA/l to any of eight common food allergens; we defined persistently low vitamin D status as cord blood 25(OH)D <11 ng/ml and postnatal 25(OH)D <30 ng/ml. RESULTS: We observed a moderate correlation between cord blood 25(OH)D at birth and venous blood 25(OH)D measured at 2-3 y (r = 0.63), but a weak correlation at <1 y (r = 0.28). There was no association between low vitamin D status and FS at any single time point alone. However, in combination, persistence of low vitamin D status at birth and in early childhood increased the risk of FS (odds ratio (OR) = 2.03, 95% confidence interval (CI): 1.02-4.04), particularly among children carrying the C allele of rs2243250 (OR = 3.23, 95% CI: 1.37-7.60). CONCLUSION: Prenatal and early postnatal vitamin D levels, along with individual genetic susceptibility, should be considered in assessing the role of vitamin D in the development of FS and food allergy.

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