Objectives Bisphenol A (BPA) is used in the electrical, mechanical, medical, and food industries. Previous studies have suggested that BPA is an endocrine disruptor. Regulation of BPA has led to increased use of bisphenol F (BPF) and bisphenol S (BPS). However, few studies have investigated the associations of BPF and BPS with thyroid dysfunction in children. Our study investigated the associations of prenatal BPA and early childhood BPA, BPF, and BPS exposure with thyroid function in 6-year-old children.
Methods Prenatal BPA concentrations were measured during the second trimester of pregnancy in an established prospective birth cohort. We measured urinary BPA, BPF, and BPS concentrations and thyroid hormone levels (thyroid-stimulating hormone, total T3, and free T4) in 6-year-old children (n=574). We examined the associations between urinary bisphenol concentrations and percentage change of thyroid hormone concentrations using multivariate linear regression. We also compared thyroid hormone levels by dividing the cohort according to BPA, BPF, and BPS concentrations.
Results The associations between prenatal BPA and total T3 levels were statistically significant in all models, except for girls when using a crude model. The associations between urinary BPA and BPS concentrations and levels of all thyroid hormones were not statistically significant. However, we observed that lower free T4 levels (-1.94%; 95% confidence interval, -3.82 to -0.03) were associated with higher urinary BPF concentrations in girls only.
Conclusions Our findings identified significant associations between prenatal BPA exposure and total T3 levels in all children and between BPF exposure and free T4 levels in girls only.
Summary
Korean summary
비스페놀 A의 건강위해성에 대한 역학적 근거들이 축적되어 비스페놀 A 대신 BPF와 BPS와 같은 대체물질이 사용되고 있다. 본 논문에서는 어머니의 산전 비스페놀 A 노출과 6세 어린이의 비스페놀 A, 비스페놀 F, 비스페놀 S 노출 정도에 따라 어린이의 갑상선호르몬 농도에 어떠한 영향을 미치는가 보고자 하였다. 어머니의 산전 비스페놀 A 노출은 어린이의 total T3 농도에 유의하게 영향을 미쳤으며, 특히 여자아이에게서 비스페놀 F 노출이 한 단위 증가할수록 free T4 농도가 유의하게 감소하는 것을 관찰하였다. 본 논문의 의의는 비스페놀 F, S가 어린이의 갑상선기능에 어떠한 영향을 미치는지 역학적 근거를 제시하였다는 점이나, 인과적 연관성을 위해서는 시간적 선후관계를 고려한 더 많은 연구가 필요하다.
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