Placental Transfer of a Hydroxylated Polychlorinated Biphenyl and Effects on Fetal and Maternal Thyroid Hormone Homeostasis in the Rat

作者：Ilonka A.T.M. Meerts · 发表于：Toxicological Sciences · 年份：2002 · DOI：10.1093/toxsci/68.2.361 · 被引用次数：263 · 研究领域：Toxic Organic Pollutants Impact、Per- and polyfluoroalkyl substances research、Effects and risks of endocrine disrupting chemicals

Earlier studies at our laboratory indicated that several hydroxylated polychlorinated biphenyls (OH-PCBs) detected in human blood could specifically inhibit thyroxine (T(4)) transport by competitive binding to the thyroid hormone transport protein transthyretin (TTR) in vitro. In the present study we investigated the effects of prenatal exposure to 5 mg/kg body weight of [14C]-labeled or unlabeled 4-OH-2,3,3',4',5-pentachlorobiphenyl (4-OH-CB107), one of the major metabolites of PCBs detected in human blood, from gestation days (GD) 10 to 16 on thyroid hormone status and metabolism in pregnant rats and their fetuses at GD 17 and GD 20. 4-OH-CB107 is a metabolite of both 2,3,3',4,4'-pentachlorobiphenyl (CB-105) and 2,3',4,4',5-pentachlorobiphenyl (CB-118). We were able to show the accumulation of 4-OH-CB107 in the fetal compartment. The fetal/maternal ratios at GD 20 in liver, cerebellum, and plasma were 11.0, 2.6, and 1.2, respectively. The 14C-4-OH-CB107-derived radioactivity in plasma was bound to TTR in both dams and fetuses. Fetal plasma TT(4) and FT(4) levels were significantly decreased at GD 17 and GD 20 (89% and 41% respectively at GD 20). Fetal thyroid stimulating hormone levels were increased by 124% at GD 20. The T(4) concentrations in fetal forebrain homogenates at GD20 were reduced by 35%, but no effects could be detected on brain T(3) concentrations. The deiodination of T(4) to T(3) was significantly increased in fetal forebrain homogenates at GD 17, and unalter...