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Assessment of human estrogen receptor agonistic/antagonistic effects of veterinary drugs used for livestock and farmed fish by OECD in vitro stably transfected transcriptional activation assays.
The presence of veterinary drug residues in foods and the environment could potentially cause adverse effects on humans and wildlife. Several veterinary drugs were reported to exhibit endocrine disrupting effects via binding affinities to sexual hormone receptors such as estrogen and androgen receptors. Therefore, we confirmed the human estrogen receptor (ER) agonistic/antagonistic effects of 135 chemicals that were used as veterinary drugs in Korea by the official Organization for Economic Cooperation and Development (OECD) in vitro ER transcriptional activation (TA) assay using the VM7Luc4E2 cell line. In the case of ER agonist screening, 7 veterinary drugs (cefuroxime, cymiazole, trenbolone, zeranol, phoxim, altrenogest and nandrolone) were determined to be ER agonists. In addition, only zeranol was found to exhibit weak ER antagonistic activity. These 7 veterinary drugs, which were determined as ER agonists and/or antagonists by an OECD in vitro assay, were also found to have binding affinity to ERs. These results indicate that various veterinary drugs possess potential (anti-)estrogenic effects. However, further study is needed to determine the precise endocrine-disrupting effects of these compounds.
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