Low level exposure to manganese from drinking water and cognition in school-age children.

Autor: Bouchard MF; CHU Sainte-Justine Research Centre, 3175 Chemin de la Côte-Sainte-Catherine, Montréal, Quebec, H3T 1C4, Canada; Department of Environmental and Occupational Health, School of Public Health, Université de Montreal, C.P. 6128 Succursale Centre-Ville, Montréal, Québec, H3C 3J7, Canada. Electronic address: maryse.bouchard@umontreal.ca., Surette C; Department of Chemistry and Biochemistry, Université de Moncton, PavillonRémi-Rossignol, 18, Avenue Antonine-Maillet, Moncton, New Brunswick, E1A 3E9, Canada. Electronic address: celine.surette@umoncton.ca., Cormier P; École de psychologie, Université de Moncton, Pavillon Léopold-Taillon, 18, Avenue Antonine-Maillet, Moncton, New Brunswick, E1A 3E9, Canada. Electronic address: pierre.cormier@umoncton.ca., Foucher D; Department of Chemistry and Biochemistry, Université de Moncton, PavillonRémi-Rossignol, 18, Avenue Antonine-Maillet, Moncton, New Brunswick, E1A 3E9, Canada. Electronic address: fouched@umoncton.ca.
Jazyk: angličtina
Zdroj: Neurotoxicology [Neurotoxicology] 2018 Jan; Vol. 64, pp. 110-117. Date of Electronic Publication: 2017 Jul 15.
DOI: 10.1016/j.neuro.2017.07.024
Abstrakt: Background: Manganese (Mn) is an element found in the environment and certain geographic areas have elevated concentrations in soil and water du to natural conditions or anthropic activities. A growing body of data suggests that exposure to manganese in drinking water could be neurotoxic.
Objective: Firstly, we aimed to examine the association between exposure to manganese from drinking water and cognition in children consuming well water. Secondly, we also aimed to examine the relation between cognition and manganese concentrations in children's hair, nail, and saliva.
Methods: A total 259 children from 189 households consuming well water were included in the present study (ages 5.9 to 13.7 years). We assessed children's cognition with the WISC-IV, and we used five indicators of manganese exposure: concentration in tap water, intake from the consumption of water divided by child's weight, manganese concentration in children's hair, toe nail, and saliva. We used General Estimating Equation analysis to assess the relation between manganese exposure indicators and IQ scores, adjusting for potential confounders, and taking into account family clusters.
Results: Drinking water manganese concentrations were generally low, with 48% of children consuming water <5μg/L, 25% >50μg/L, and 4% >400μg/L. Results differed by sex. In girls, higher manganese concentration in water, hair, and toe nail were associated with poorer Performance IQ scores but this was significant only for toe nail (for a 10-fold increase in manganese, β: -5.65, 95% CIs: -10.97, -0.32). Opposite associations were observed in boys, i.e., better Performance IQ scores with higher manganese concentration hair, toe nail, and water, the latter being significant (β: 2.66, 95% CIs: 0.44, 4.89). Verbal IQ scores did not seem to be associated with manganese exposure indicators.
Conclusions: Drinking water manganese levels were considerably lower than in previous studies reporting neurotoxic effects. There was no clear indication of an association between exposure to manganese and cognitive development in this sample of school-age children although the data suggest there might be sex-specific associations. Given the low levels of exposure and sex-specific associations, a larger sample size would have been required to increase the statistical power and better characterize the relations.
(Copyright © 2017 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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