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Disruption of estrogen-sensitive, estrogen receptor (ER)-dependent events during porcine uterine development between birth (postnatal day=PND 0) and PND 14 affects patterns of uterine morphoregulatory gene expression in the neonate with lasting consequences for reproductive success. Uterine capacity for conceptus support is reduced in pregnant adult gilts exposed to estradiol valerate (EV) for 14 days from birth. Objectives here were to determine effects of EV exposure from birth through PND 13 on neonatal uterine and adult endometrial markers of growth, patterning, and remodeling. Targets included the relaxin receptor (RXFP1), estrogen receptor-alpha (ESR1) and vascular endothelial growth factor (VEGFA), morphoregulatory markers HOXA10 and WNT7A, and the matrix metalloproteinases (MMP)2 and MMP9. Gilts were treated daily with EV (50 microg/kg body weight per day, i.m.) or corn oil vehicle from birth through PND 13. Uteri were obtained from neonates on PND 14 and from adults on pregnancy day 12 (PxD 12). In neonates, EV exposure from birth increased uterine RXFP1 gene expression, and both ESR1 and VEGFA proteins. At PxD 12, endometrial RXFP1 mRNA remained elevated, while ESR1 protein was reduced. Early EV treatment decreased neonatal uterine WNT7A, but increased HOXA10 expression. WNT7A expression was reduced in EV-treated adults. Transient EV exposure increased MMP9 transcripts at PND 14, whereas both latent and active MMP9 activity was increased due to early EV treatment in adults on PxD 12. Results support the hypothesis that transient, estrogen-induced disruption of porcine uterine development from birth alters early programming events that lead to functional consequences in the adult.

reproduction

Transient estrogen exposure from birth affects uterine expression of developmental markers in neonatal gilts with lasting consequences in pregnant adults