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Thyroid hormones and thyroid disease in relation to perchlorate dose and residence near a superfund site

Abstract

Perchlorate is a widely occurring contaminant, which can competitively inhibit iodide uptake and thus thyroid hormone production. The health effects of chronic low dose perchlorate exposure are largely unknown. In a community-based study, we compared thyroid function and disease in women with differing likelihoods of prior and current perchlorate exposure. Residential blocks were randomly selected from areas: (1) with potential perchlorate exposure via drinking water; (2) with potential exposure to environmental contaminants; and (3) neighboring but without such exposures. Eligibility included having lived in the area for ≥6 months and aged 20–50 years during 1988–1996 (during documented drinking water well contamination). We interviewed 814 women and collected blood samples (assayed for thyroid stimulating hormone and free thyroxine) from 431 interviewed women. Daily urine samples were assayed for perchlorate and iodide for 178 premenopausal women with blood samples. We performed multivariable regression analyses comparing thyroid function and disease by residential area and by urinary perchlorate dose adjusted for urinary iodide levels. Residential location and current perchlorate dose were not associated with thyroid function or disease. No persistent effect of perchlorate on thyroid function or disease was found several years after contaminated wells were capped.

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Layal Chaker, Salman Razvi, … Robin P. Peeters

Abbreviations

cm:

centimeters

fT4:

free thyroxine

kg:

kilograms

mIU/l:

milli-international units/liter

ng/dl:

nanograms/deciliter

NHANES:

National Health and Nutrition Examination Survey

T3:

triiodothyronine

TCE:

trichloroethylene

TSH:

thyroid stimulating hormone

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Acknowledgements

This project was supported by Grant Numbers P42ES004699 and 5P30ES005707 from the National Institute of Environmental Health Sciences and contract 200-2007-M-19584 from the Centers for Disease Control and Prevention. The content is solely the responsibility of the authors and does not represent the official views of the National Institute of Environmental Health Sciences, the National Institutes of Health or the Centers for Disease Control and Prevention.

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Correspondence to Ellen B Gold.

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Gold, E., Blount, B., O'Neill Rasor, M. et al. Thyroid hormones and thyroid disease in relation to perchlorate dose and residence near a superfund site. J Expo Sci Environ Epidemiol 23, 399–408 (2013). https://doi.org/10.1038/jes.2012.90

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