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Blood and hair manganese concentrations in pregnant women from the infants' environmental health study (ISA) in Costa Rica.

ABSTRACT: Manganese (Mn), an essential nutrient, is a neurotoxicant at high concentrations. We measured Mn concentrations in repeated blood and hair samples collected from 449 pregnant women living near banana plantations with extensive aerial spraying of Mn-containing fungicide mancozeb in Costa Rica, and examined environmental and lifestyle factors associated with these biomarkers. Mean blood Mn and geometric mean hair Mn concentrations were 24.4 ?g/L (8.9-56.3) and 1.8 ?g/g (0.05-53.3), respectively. Blood Mn concentrations were positively associated with gestational age at sampling (? = 0.2; 95% CI: 0.1 to 0.2), number of household members (? = 0.4; 95% CI: 0.1 to 0.6), and living in a house made of permeable and difficult-to-clean materials (? = 2.6; 95% CI: 1.3 to 4.0); and inversely related to smoking (? = -3.1; 95% CI: -5.8 to -0.3). Hair Mn concentrations were inversely associated with gestational age at sampling (% change = 0.8; 95% CI: -1.6 to 0.0); and positively associated with living within 50 m of a plantation (% change = 42.1; 95% CI: 14.2 to 76.9) and Mn concentrations in drinking water (% change = 17.5; 95% CI: 12.2 to 22.8). Our findings suggest that pregnant women living near banana plantations aerially sprayed with mancozeb may be environmentally exposed to Mn.

SUBMITTER: Mora AM

PROVIDER: S-EPMC3983325 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature

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Blood and hair manganese concentrations in pregnant women from the infants' environmental health study (ISA) in Costa Rica.

Mora Ana M AM van Wendel de Joode Berna B Mergler Donna D Córdoba Leonel L Cano Camilo C Quesada Rosario R Smith Donald R DR Menezes-Filho José A JA Lundh Thomas T Lindh Christian H CH Bradman Asa A Eskenazi Brenda B

Environmental science & technology 20140306 6

Manganese (Mn), an essential nutrient, is a neurotoxicant at high concentrations. We measured Mn concentrations in repeated blood and hair samples collected from 449 pregnant women living near banana plantations with extensive aerial spraying of Mn-containing fungicide mancozeb in Costa Rica, and examined environmental and lifestyle factors associated with these biomarkers. Mean blood Mn and geometric mean hair Mn concentrations were 24.4 μg/L (8.9-56.3) and 1.8 μg/g (0.05-53.3), respectively. B ...[more]

PMID: 24601641

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Project description:BackgroundAnimal studies have shown that both deficiency and excess manganese (Mn) may result in decreased fetal size and weight, but human studies have reported inconsistent results.MethodsWe examined the association of blood and hair Mn concentrations measured at different times during pregnancy with fetal growth among term births and length of gestation in a cohort of 380 mother-infant pairs living near banana plantations aerially sprayed with Mn-containing fungicides in Costa Rica. We used linear regression and generalized additive models to test for linear and nonlinear associationsResultsMean (± SD) blood Mn concentration was 24.4 ± 6.6 μg/L and geometric mean (geometric SD) hair Mn concentration was 1.8 (3.2) μg/g. Hair Mn concentrations during the second and third trimesters of gestation were positively related to infant chest circumference (β for 10-fold increase = 0.62 cm; 95% CI: 0.16, 1.08; and β = 0.55 cm; 95% CI: -0.16, 1.26, respectively). Similarly, average maternal hair Mn concentrations during pregnancy were associated with increased chest circumference (β for 10-fold increase = 1.19 cm; 95% CI: 0.43, 1.95) in infants whose mothers did not have gestational anemia, but not in infants of mothers who had gestational anemia (β = 0.39 cm; 95% CI: -0.32, 1.10; pINT=0.14). All these associations were linear. Blood Mn concentrations did not show consistent linear nor nonlinear relationships with any of the birth outcomesConclusionsMn plays an important role in fetal development, but the extent to which environmental exposures may cause adverse health effects to the developing fetus is not well understood. Among women living near banana plantations in Costa Rica, we did not observe linear or nonlinear associations of Mn concentrations with lowered birth weight or head circumference, as reported in previous studies. However, we did find positive linear associations between maternal hair Mn concentrations during pregnancy and infant chest circumference.

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Dataset Information

Blood and hair manganese concentrations in pregnant women from the infants' environmental health study (ISA) in Costa Rica.

Publications

Blood and hair manganese concentrations in pregnant women from the infants' environmental health study (ISA) in Costa Rica.

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