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- W2803157964 abstract "Sulfonation is a major pathway of estrogen biotransformation with a role in regulating estrogen homeostasis in humans and sheep. Previous in vitro studies found that triclosan is an especially potent competitive inhibitor of ovine placental estrogen sulfotransferase, with Kic of <0.1 nM. As the placenta is the main organ responsible for estrogen synthesis in pregnancy in both women and sheep, and the liver is another site of estrogen biotransformation, this study examined the effects of triclosan exposure of pregnant ewes on placental and hepatic sulfotransferase activity. Triclosan, 0.1 mg/kg/day, or saline vehicle was administered to late gestation fetal sheep for two days either by direct infusion into the fetal circulation or infusion into the maternal blood. On the third day, fetal liver and placenta were harvested and analyzed for triclosan and for cytosolic estradiol sulfotransferase activity. Placenta contained higher concentrations of triclosan than liver in each individual sheep in both treatment groups. There was a negative correlation between triclosan tissue concentration (pmol/g tissue) and cytosolic sulfotransferase activity (pmol/min/mg protein) towards estradiol. These findings demonstrated that in the sheep exposed to very low concentrations of triclosan, this substance is taken up into placenta and reduces estrogen sulfonation." @default.
- W2803157964 created "2018-06-01" @default.
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- W2803157964 date "2018-09-01" @default.
- W2803157964 modified "2023-09-28" @default.
- W2803157964 title "Administration of low dose triclosan to pregnant ewes results in placental uptake and reduced estradiol sulfotransferase activity in fetal liver and placenta" @default.
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- W2803157964 doi "https://doi.org/10.1016/j.toxlet.2018.05.014" @default.
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