TY - JOUR
T1 - Prenatal lead exposure and childhood lung function
T2 - Influence of maternal cortisol and child sex
AU - Rosa, Maria José
AU - Tamayo-Ortiz, Marcela
AU - Mercado Garcia, Adriana
AU - Rivera Rivera, Nadya Y.
AU - Bush, Douglas
AU - Lee, Alison G.
AU - Solano-González, Maritsa
AU - Amarasiriwardena, Chitra
AU - Téllez-Rojo, Martha Maria
AU - Wright, Robert O.
AU - Wright, Rosalind J.
N1 - Publisher Copyright:
© 2021 The Authors
PY - 2022/4/1
Y1 - 2022/4/1
N2 - Introduction: Maternal hypothalamic-pituitary-adrenal (HPA) axis disruption in pregnancy may contribute to the programming of childhood respiratory disease and may modify the effect of chemical toxins, like lead (Pb), on lung development. Child sex may further modify these effects. We sought to prospectively examine associations between maternal HPA axis disruption, prenatal Pb and childhood lung function and explore potential effect modification by maternal cortisol and child sex on the association between prenatal Pb and lung function outcomes. Materials and methods: Analyses included 222 mothers and children enrolled in a longitudinal birth cohort study in Mexico City. Maternal diurnal salivary cortisol was assessed in pregnancy; cortisol awakening response (CAR) and diurnal slope were calculated. Blood Pb was measured during the second trimester of pregnancy. Post-bronchodilator lung function was tested at ages 8–11 years. Associations were modeled using generalized linear models with interaction terms, adjusting for covariates. Results: A higher (flatter) diurnal slope was associated with lower FEV1/FVC ratio (β: 0.433, 95%CI [-0.766, −0.101]). We did not find any main effect associations between prenatal Pb and lung function outcomes. We report an interaction between Pb and cortisol in relation to FEV1/FVC and FEF25–75% (pinteraction<0.05 for all). Higher prenatal Pb was associated with reduced FEV1/FVC only in children whose mothers had a high CAR. Higher prenatal Pb was also associated with reduced FEV1/FVC and FEF25–75% in mothers with a flatter diurnal slope. A 3-way interaction between prenatal Pb, CAR and sex on FEV1/FVC, indicated that boys born to women with high CAR and higher prenatal Pb levels had lower FEV1/FVC ratios (pinteraction = 0.067). Conclusions: Associations between prenatal Pb and childhood lung function were modified by disrupted maternal cortisol in pregnancy and child sex. These findings underscore the need to consider complex interactions to fully elucidate effects of prenatal Pb exposure on childhood lung function.
AB - Introduction: Maternal hypothalamic-pituitary-adrenal (HPA) axis disruption in pregnancy may contribute to the programming of childhood respiratory disease and may modify the effect of chemical toxins, like lead (Pb), on lung development. Child sex may further modify these effects. We sought to prospectively examine associations between maternal HPA axis disruption, prenatal Pb and childhood lung function and explore potential effect modification by maternal cortisol and child sex on the association between prenatal Pb and lung function outcomes. Materials and methods: Analyses included 222 mothers and children enrolled in a longitudinal birth cohort study in Mexico City. Maternal diurnal salivary cortisol was assessed in pregnancy; cortisol awakening response (CAR) and diurnal slope were calculated. Blood Pb was measured during the second trimester of pregnancy. Post-bronchodilator lung function was tested at ages 8–11 years. Associations were modeled using generalized linear models with interaction terms, adjusting for covariates. Results: A higher (flatter) diurnal slope was associated with lower FEV1/FVC ratio (β: 0.433, 95%CI [-0.766, −0.101]). We did not find any main effect associations between prenatal Pb and lung function outcomes. We report an interaction between Pb and cortisol in relation to FEV1/FVC and FEF25–75% (pinteraction<0.05 for all). Higher prenatal Pb was associated with reduced FEV1/FVC only in children whose mothers had a high CAR. Higher prenatal Pb was also associated with reduced FEV1/FVC and FEF25–75% in mothers with a flatter diurnal slope. A 3-way interaction between prenatal Pb, CAR and sex on FEV1/FVC, indicated that boys born to women with high CAR and higher prenatal Pb levels had lower FEV1/FVC ratios (pinteraction = 0.067). Conclusions: Associations between prenatal Pb and childhood lung function were modified by disrupted maternal cortisol in pregnancy and child sex. These findings underscore the need to consider complex interactions to fully elucidate effects of prenatal Pb exposure on childhood lung function.
KW - Cortisol
KW - Lead
KW - Pediatric lung function
KW - Prenatal
UR - http://www.scopus.com/inward/record.url?scp=85120800578&partnerID=8YFLogxK
U2 - 10.1016/j.envres.2021.112447
DO - 10.1016/j.envres.2021.112447
M3 - Article
C2 - 34875261
AN - SCOPUS:85120800578
SN - 0013-9351
VL - 205
JO - Environmental Research
JF - Environmental Research
M1 - 112447
ER -