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Am J Physiol Regul Integr Comp Physiol. 2018 Jan 1;314(1):R22-R33. doi: 10.1152/ajpregu.00549.2016. Epub 2017 Oct 4.

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

Author information

1
Robinson Research Institute, University of Adelaide , Adelaide, South Australia , Australia.
2
Adelaide Medical School, University of Adelaide , Adelaide, South Australia , Australia.
3
The Ritchie Centre, Hudson Institute of Medical Research , Clayton, Victoria , Australia.
4
Department of Physiology, Monash University , Melbourne, Victoria , Australia.
5
School of Population Health, University of Adelaide , Adelaide, South Australia , Australia.
6
Perelman School of Medicine, University of Pennsylvania , Philadelphia, Pennsylvania.
7
Lewis-Sigler Institute for Integrative Genomics and Department of Chemistry, Princeton University , Princeton, New Jersey.
8
School of Animal and Veterinary Sciences, University of Adelaide , Adelaide, South Australia , Australia.
9
Mater Research Institute-University of Queensland and Translational Research Institute, South Brisbane, Queensland, Australia.

Abstract

Perinatal exposures are associated with altered risks of childhood allergy. Human studies and our previous work suggest that 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. Therefore, we examined whether late-gestation maternal dietary methyl donor and cofactor 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 cofactor 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 the responses of CON and PR sheep. Cutaneous hypersensitivity responses to house dust mites did not differ between treatments. In singleton progeny, upper dermal mast cell density was greater in PR + Methyl than in 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.

KEYWORDS:

animal models; fetal growth; folic acid; intrauterine growth restriction; mast cells; methyl donors

PMID:
28978515
PMCID:
PMC5866368
DOI:
10.1152/ajpregu.00549.2016
[Indexed for MEDLINE]
Free PMC Article

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