Prenatal bisphenol a exposure and dysregulation of infant hypothalamic-pituitary-adrenal axis function: findings from the APrON cohort study

• Published in: Environmental health Vol. 16; no. 1; p. 47
• Main Authors: Giesbrecht, Gerald F, Ejaredar, Maede, Liu, Jiaying, Thomas, Jenna, Letourneau, Nicole, Campbell, Tavis, Martin, Jonathan W, Dewey, Deborah
• Format: Journal Article
• Language: English
• Published: England BioMed Central 19.05.2017; BMC
• Subjects: Adult; Alberta - epidemiology; Animal models; Anxiety; Babies; Benzhydryl Compounds - adverse effects; Benzhydryl Compounds - urine; Bisphenol A; Blood; Brain research; Breastfeeding & lactation; Childbirth & labor; Children; Cohort analysis; Cohort Studies; Consistency; Cortisol; Creatinine; Disruption; Endocrine Disruptors - adverse effects; Endocrine Disruptors - urine; Endocrine system; Environmental health; Environmental Pollutants - adverse effects; Environmental Pollutants - urine; Exposure; Female; Females; Fetal exposure; Fetuses; Gender aspects; Hormones; Humans; Hydrocortisone - analysis; Hypothalamic-pituitary-adrenal axis; Hypothalamo-Hypophyseal System - drug effects; Hypothalamus; Hypotheses; Infant stress reactivity; Infants; Male; Males; Maternal Exposure - adverse effects; Neuroendocrine system; Neurosciences; Nutrition; Offspring; Organic chemicals; Pediatrics; Phenols - adverse effects; Phenols - urine; Pituitary; Pituitary-Adrenal System - drug effects; Pregnancy; Prenatal experience; Prenatal Exposure Delayed Effects; Rodents; Saliva; Saliva - chemistry; Sex; Sex Characteristics; Sex differences; Sexual behavior; Sexual dimorphism; Stress, Psychological; Studies; Urine; Womens health; Young Adult; Hypothalamic-pituitary-adrenal axis; Infant stress reactivity; Cortisol; Bisphenol-A; Fetal exposure
• ISSN: 1476-069X; 1476-069X
• DOI: 10.1186/s12940-017-0259-8

Animal models show that prenatal bisphenol A (BPA) exposure leads to sexually dimorphic disruption of the neuroendocrine system in offspring, including the hypothalamic-pituitary-adrenal (HPA) neuroendocrine system, but human data are lacking. In humans, prenatal BPA exposure is associated with sex-specific behavioural problems in children, and HPA axis dysregulation may be a biological mechanism. The objective of the current study was to examine sex differences in associations between prenatal maternal urinary BPA concentration and HPA axis function in 3 month old infants. Mother-infant pairs (n = 132) were part of the Alberta Pregnancy Outcomes and Nutrition study, a longitudinal birth cohort recruited (2010-2012) during pregnancy. Maternal spot urine samples collected during the 2nd trimester were analyzed for total BPA and creatinine. Infant saliva samples collected prior to and after a blood draw were analyzed for cortisol. Linear growth curve models were used to characterize changes in infant cortisol as a function of prenatal BPA exposure. Higher maternal BPA was associated with increases in baseline cortisol among females (β = 0.13 log μg/dL; 95% CI: 0.01, 0.26), but decreases among males (β = -0.22 log μg/dL; 95% CI: -0.39, -0.05). In contrast, higher BPA was associated with increased reactivity in males (β = .30 log μg/dL; 95% CI: 0.04, 0.56) but decreased reactivity in females (β = -0.15 log μg/dL; 95% CI: -0.35, 0.05). Models adjusting for creatinine yielded similar results. Prenatal BPA exposure is associated with sex-specific changes in infant HPA axis function. The biological plausibility of these findings is supported by their consistency with evidence in rodent models. Furthermore, these data support the hypotheses that sexually dimorphic changes in children's behaviour following prenatal BPA exposure are mediated by sexually dimorphic changes in HPA axis function.