Late gestation maternal dietary methyl donor and cofactor supplementation in sheep partially reverses protection against allergic sensitization by IUGR.

TitleLate gestation maternal dietary methyl donor and cofactor supplementation in sheep partially reverses protection against allergic sensitization by IUGR.
Publication TypeJournal Article
Year of Publication2017
AuthorsWooldridge, AL, Bischof, RJ, Liu, H, Heinemann, GK, Hunter, DS, Giles, LC, Simmons, RA, Lien, Y-C, Lu, W, Rabinowitz, JD, Kind, KL, Owens, JA, Clifton, VL, Gatford, KL
JournalAm J Physiol Regul Integr Comp Physiol
Paginationajpregu.00549.2016
Date Published2017 Oct 04
ISSN1522-1490
Abstract

Perinatal exposures are associated with altered risks of childhood allergy. Human studies and our previous work suggest restricted growth in utero (IUGR) is protective against allergic disease. The mechanisms are not clearly defined but reduced fetal abundance and altered metabolism of methyl donors are hypothesized as possible underlying mechanisms. We therefore examined whether late gestation maternal dietary methyl donor and co-factor supplementation of the placentally-restricted (PR) sheep pregnancy would reverse allergic protection in progeny. Allergic outcomes were compared between progeny from control pregnancies (CON, n=49), from PR pregnancies without intervention (PR, n=28), and from PR pregnancies where the dam was fed a methyl donor plus co-factor supplement from day 120 of pregnancy until delivery (PR+METHYL, n=25). Both PR and PR+METHYL progeny were smaller than CON; supplementation did not alter birth size. PR was protective against cutaneous hypersensitivity responses to ovalbumin (OVA, P < 0.01 in singletons). Cutaneous hypersensitivity responses to OVA in PR+METHYL progeny were intermediate to and not different from responses of CON and PR sheep. Cutaneous hypersensitivity responses to house dust mite did not differ between treatments. In singleton progeny, upper dermal mast cell density was greater in PR+METHYL than PR or CON (each P < 0.05). The differences in the cutaneous allergic response were not explained by treatment effects on circulating immune cells or antibodies. Our results suggest that mechanisms underlying in utero programming of allergic susceptibility by IUGR and methyl donor availability may differ, and imply that late gestation methyl donor supplementation may increase allergy risk.

DOI10.1152/ajpregu.00549.2016
Alternate JournalAm. J. Physiol. Regul. Integr. Comp. Physiol.
PubMed ID28978515