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Environmental Health

, 13:106

Children-s Environmental Health

Abstract

BackgroundEndocrine disrupting chemicals EDCs present in the environment may disrupt thyroid hormones, which in early life are essential for brain development. Observational studies regarding this topic are still limited, however as the presence of chemicals in the environment is ubiquitous, further research is warranted. The objective of the current study was to assess the association between exposure markers of various EDCs and thyroxine T4 levels in newborns in a mother-child cohort in the Netherlands.

MethodsExposure to dichlorodiphenyldichloroethylene DDE, three di-2-ethylhexyl phthalate DEHP metabolites, hexachlorobenzene HCB, polychlorinated biphenyl PCB-153, perfluorooctanesulfonic acid PFOS, and perfluorooctanoic acid PFOA was determined in cord plasma or breast milk, and information on T4 levels in heel prick blood spots was obtained through the neonatal screening programme in the Netherlands. Linear regression models were composed to determine associations between each of the compounds and T4, which were stratified for gender and adjusted for a priori defined covariates.

ResultsMean T4 level was 86.9 nmol-L n = 83. Girls in the highest quartile of DDE and PFOA exposure showed an increased T4 level compared to the lowest quartile with both crude and fully adjusted models DDE > 107.50 ng-L, +24.8 nmol-L, 95% CI 0.79, 48.75; PFOA > 1200 ng-L, +38.6 nmol-L, 95% CI 13.34, 63.83. In boys a lower T4 level was seen in the second quartile of exposure for both PFOS and PFOA, however after fully adjusting the models these associations were attenuated. No effects were observed for the other compounds.

ConclusionDDE and perfluorinated alkyl acids may be associated with T4 in a sex-specific manner. These results should however be interpreted with caution, due to the relatively small study population. More research is warranted, as studies on the role of environmental contaminants in this area are still limited.

KeywordsEndocrine disruptors Fetal basis of adult disease Thyroxine Prenatal exposure AbbreviationsBMIBody mass index

DDEDichlorodiphenyldichloroethylene

DEHPDi-2-ethylhexyl phthalate

EDCsEndocrine disrupting chemicals

fT4Free thyroxine

HCBHexachlorobenzene

LOQLimit of quantification

MECPPMono2-ethyl-5-carboxypentylphthalate

MEHHPMono2-ethyl-5-hydroxyhexylphthalate

MEHPMono2-ethylhexylphthalate

MEOHPMono2-ethyl-5-oxohexylphthalate

PBDEPolybrominated diphenylether

PCB-153Polychlorinated biphenyl-153

PFAAsPerfluorinated alkyl acids

PFOAPerfluorooctanoic acid

PFOSPerfluorooctanesulfonic acid

T33,5,3′-triiodothyronine

T4Thyroxine

THThyroid hormones

TSHThyroid stimulating hormone.

Electronic supplementary materialThe online version of this article doi:10.1186-1476-069X-13-106 contains supplementary material, which is available to authorized users.

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Author: Marijke de Cock - Michiel R de Boer - Marja Lamoree - Juliette Legler - Margot van de Bor

Source: https://link.springer.com/







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