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The association between prenatal perfluoroalkyl substance exposure and symptoms of attention-deficit/hyperactivity disorder in 8-year-old children and the mediating role of thyroid hormones in the Hokkaido study

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Title: The association between prenatal perfluoroalkyl substance exposure and symptoms of attention-deficit/hyperactivity disorder in 8-year-old children and the mediating role of thyroid hormones in the Hokkaido study
Authors: Itoh, Sachiko Browse this author →KAKEN DB
Yamazaki, Keiko Browse this author →KAKEN DB
Suyama, Satoshi Browse this author
Ikeda-Araki, Atsuko Browse this author →KAKEN DB
Miyashita, Chihiro Browse this author →KAKEN DB
Bamai, Yu Ait Browse this author →KAKEN DB
Kobayashi, Sumitaka Browse this author →KAKEN DB
Masuda, Hideyuki Browse this author →KAKEN DB
Yamaguchi, Takeshi Browse this author →KAKEN DB
Goudarzi, Houman Browse this author →KAKEN DB
Okada, Emiko Browse this author →KAKEN DB
Kashino, Ikuko Browse this author →KAKEN DB
Saito, Takuya Browse this author →KAKEN DB
Kishi, Reiko Browse this author →KAKEN DB
Keywords: Perfluoroalkyl substances
Neurodevelopment
Thyroid hormone
Mediation analysis
Birth cohort
Issue Date: 2022
Publisher: Elsevier
Journal Title: Environment international
Volume: 159
Start Page: 107026
Publisher DOI: 10.1016/j.envint.2021.107026
Abstract: Background: Disruption of thyroid hormone (TH) levels during pregnancy contributes to attention deficit hyperactivity disorder (ADHD). Exposure to perfluoroalkyl substances (PFAS) during gestation may affect levels of maternal and neonatal TH; however, little is known about the effect of PFAS on ADHD mediated by TH. Objectives: We investigated the impact of maternal PFAS exposure on children's ADHD symptoms with the mediating effect of TH. Methods: In a prospective birth cohort (the Hokkaido study), we included 770 mother-child pairs recruited between 2002 and 2005 for whom both prenatal maternal and cord blood samples were available. Eleven PFAS were measured in maternal serum obtained at 28-32 weeks of gestation using ultra-performance liquid chromatography coupled with triple quadrupole tandem mass spectrometry. TH and thyroid antibody, including thyroid-stimulating hormone (TSH), free triiodothyronine (FT3), free thyroxine (FT4), thyroid peroxidase antibody (TPOAb), and thyroglobulin antibody (TgAb) were measured in maternal blood during early pregnancy (median 11 gestational weeks) and in cord blood at birth. ADHD symptoms in the children at 8 years of age were rated by their parents using the ADHD-Rating Scale (ADHD-RS). The cut-off value was set at the 80th percentile for each sex. Results: Significant inverse associations were found between some PFAS in maternal serum and ADHD symptoms among first-born children. Assuming causality, we found only one significant association: maternal FT4 mediated 17.6% of the estimated effect of perfluoroundecanoic acid exposure on hyperactivity-impulsivity among firstborn children. Discussion: Higher PFAS levels in maternal serum during pregnancy were associated with lower risks of ADHD symptoms at 8 years of age. The association was stronger among first-born children in relation to hyperactivity-impulsivity than with regard to inattention. There was little mediating role of TH during pregnancy in the association between maternal exposure to PFAS and reduced ADHD symptoms at 8 years of age.
Type: article
URI: http://hdl.handle.net/2115/83948
Appears in Collections:環境健康科学研究教育センター (Center for Environmental and Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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