Placental microplastics contamination and its impact on thyroid function in newborns

作者：Xuan Zhang, Li Li, Yue Zhang, Bing‐Ying Liu, Xiaoyan Wang, Lei Sun · 发表于：Ecotoxicology and Environmental Safety · 年份：2025 · DOI：10.1016/j.ecoenv.2025.119056 · 被引用次数：10 · 研究领域：Microplastics and Plastic Pollution、Effects and risks of endocrine disrupting chemicals

Microplastics (MPs), which have been identified in human tissues such as the placenta, may pose potential risks to newborn health by interfering with thyroid function, a critical regulator of growth and development. This study investigates the association between placental microplastic levels and thyroid hormone profiles in newborns. We investigated the effect of placental microplastic exposure on fetal thyroid hormone levels in a cohort of 1250 mother-child pairs enrolled between 2022 and 2024. Umbilical cord blood thyroid hormone concentrations (free thyroxine [T4], free triiodothyronine [T3], and thyroid-stimulating hormone [TSH]) were measured, and placental microplastics (PVC, PP, and PBS) were quantified. Multivariable regression models (MLR), quantile g-computation (g-comp) and Bayesian Kernel Machine Regression (BKMR) were used to assess the effects of microplastics on thyroid hormone levels, adjusted for relevant covariates. Adjusted MLR models confirmed that individual microplastic types, including PVC, PP, and PBS, were significantly associated with reductions in T4 levels (β = -1.40, -0.74, and -0.85, respectively) and TSH levels (β = -1.27, -2.87, and -1.94, respectively), as well as decreases in the T4/T3 ratio (β = -5.60, and -2.68 for PVC and PP, respectively). PP exposure was the only microplastic type associated with an increase in T3 levels (β = 0.05; 95 % CI: 0.01, 0.10; p = 0.03). G-comp analysis showed that each quartile increases in exposure corresponde...