Deborah J Watkins1, Karen E Peterson1, Kelly K Ferguson1, Adriana Mercado-García1, Marcela Tamayo y Ortiz1, Alejandra Cantoral1, John D Meeker1, Martha Maria Téllez-Rojo1. 1. Department of Environmental Health Sciences (D.J.W., K.K.F., J.D.M.), School of Public Health, University of Michigan, Ann Arbor, Michigan 48109; Department of Nutritional Sciences (K.E.P.), School of Public Health, University of Michigan, Ann Arbor, Michigan 48109; Center for Human Growth and Development (K.E.P.), University of Michigan, Ann Arbor, Michigan 48109; Department of Nutrition (K.E.P.), Harvard T.H. Chan School of Public Health, Boston, Massachusetts 02115; and Center for Nutrition and Health Research (A.M.-G., M.T.y.O., A.C., M.M.T.-R.), National Institute of Public Health, Cuernavaca, Morelos 62508 Mexico.
Abstract
CONTEXT: Exposure to endocrine-disrupting chemicals during development may play a role in the increasing prevalence of metabolic syndrome and type 2 diabetes among children and adolescents by interfering with metabolic homeostasis. OBJECTIVE: To explore associations between in utero and peripubertal urinary phthalate metabolite and bisphenol A (BPA) concentrations and markers of peripubertal metabolic homeostasis. DESIGN: Early Life Exposure in Mexico to Environmental Toxicants (ELEMENT): a longitudinal cohort study of pregnant women in Mexico City and their offspring. SETTING: Public maternity hospitals in Mexico City. PATIENTS OR OTHER PARTICIPANTS: Women recruited during pregnancy; offspring recruited for follow-up at age 8-14 years (n = 250). INTERVENTIONS: None. MAIN OUTCOME MEASURES: Fasting serum c-peptide, IGF-1, leptin, and glucose concentrations among children at follow-up; calculated measures of insulin secretion and insulin resistance. RESULTS: Phthalate metabolites and BPA were associated with metabolism biomarkers at age 8-14 years in patterns that varied by sex, pubertal status, and exposure timing. For example, in utero monoethyl phthalate was associated with lower insulin secretion among pubertal boys (P = .02) and higher leptin among girls (P = .04). In utero di-2-ethylhexyl phthlate was associated with higher IGF-1 among pubertal girls; peripubertal di-2-ethylhexyl phthlate was associated with higher IGF-1, insulin secretion, and resistance among prepubertal girls. In contrast, peripubertal dibutyl phthalate, monobenzyl phthalate, and mono-3-carboxypropyl phthalate were associated with lower IGF-1 among pubertal boys. Peripubertal BPA was associated with higher leptin in boys (P = .01). CONCLUSIONS: Considering the long-term health effects related to metabolic syndrome, additional research on exposure and metabolic outcomes across developmental periods and early adulthood is needed.
CONTEXT: Exposure to endocrine-disrupting chemicals during development may play a role in the increasing prevalence of metabolic syndrome and type 2 diabetes among children and adolescents by interfering with metabolic homeostasis. OBJECTIVE: To explore associations between in utero and peripubertal urinary phthalate metabolite and bisphenol A (BPA) concentrations and markers of peripubertal metabolic homeostasis. DESIGN: Early Life Exposure in Mexico to Environmental Toxicants (ELEMENT): a longitudinal cohort study of pregnant women in Mexico City and their offspring. SETTING: Public maternity hospitals in Mexico City. PATIENTS OR OTHER PARTICIPANTS: Women recruited during pregnancy; offspring recruited for follow-up at age 8-14 years (n = 250). INTERVENTIONS: None. MAIN OUTCOME MEASURES: Fasting serum c-peptide, IGF-1, leptin, and glucose concentrations among children at follow-up; calculated measures of insulin secretion and insulin resistance. RESULTS:Phthalate metabolites and BPA were associated with metabolism biomarkers at age 8-14 years in patterns that varied by sex, pubertal status, and exposure timing. For example, in utero monoethyl phthalate was associated with lower insulin secretion among pubertal boys (P = .02) and higher leptin among girls (P = .04). In utero di-2-ethylhexyl phthlate was associated with higher IGF-1 among pubertal girls; peripubertal di-2-ethylhexyl phthlate was associated with higher IGF-1, insulin secretion, and resistance among prepubertal girls. In contrast, peripubertal dibutyl phthalate, monobenzyl phthalate, and mono-3-carboxypropyl phthalate were associated with lower IGF-1 among pubertal boys. Peripubertal BPA was associated with higher leptin in boys (P = .01). CONCLUSIONS: Considering the long-term health effects related to metabolic syndrome, additional research on exposure and metabolic outcomes across developmental periods and early adulthood is needed.
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