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• W1966287514 abstract "The possible adverse effects of the so-called environmental estrogens have raised considerable concern. Developmental, endocrine and reproductive disorders in wildlife animals have been linked to high exposure to persistent environmental chemicals with estrogen-like activity (xenoestrogens); yet, the potential impact of environmental estrogens on human health is currently under debate also due to lack of data. A battery of in vitro assays exist for identifying compounds with estrogenic activity, but only a few models are available to assess estrogenic potency in a multiparametric analysis. We have recently established the endometrial adenocarcinoma cell line RUCA-I; it enables us to compare estrogenic effects both in vitro and in vivo as these cells are estrogen responsive in vitro and grow estrogen sensitive tumors if inoculated in syngeneic animals in vivo. Here we report in vitro data concerning (a) the relative binding affinity of the selected synthetic chemicals Bisphenol A, nonylphenol, p-tert-octylphenol, and o,p-DDT to the estrogen receptor of RUCA-I cells and (b) the relative potency of these compounds in inducing increased production of complement C3, an endogenous estrogen-responsive gene. Competitive Scatchard analysis revealed that xenoestrogens bound with an at least 1000-fold lower affinity to the estrogen receptor of RUCA-I cells than estradiol itself, thereby exhibiting the following affinity ranking, estradiol>>>nonylphenol>bisphenol A approximately p-tert-octylphenol>o,p-DDT. Despite these low binding affinities, bisphenol A, nonylphenol and p-tert-octylphenol increased production of complement C3 in a dose dependent manner. Compared with estradiol, only 100-fold higher concentrations were needed for all the compounds to achieve similar levels of induction, except o,p-DDT which was by far less potent. Northern blot analyses demonstrated that the increased production of complement C3 was mediated by an increased transcription. In summary, cultured RUCA-I cells represent a valuable endometrial derived model system to assess the relative potencies and the molecular mode of action of environmental estrogens in vitro. Our results further show that no intimate correlation exists between the relative binding affinity and the biological response of these compounds. Therefore, data obtained from single-parametric analyses may result in misleading conclusions. On the other hand, the presented in vitro data will provide us with tools to study the activity of xenoestrogens in vivo and thus carry risk assessment one step further." @default.
• W1966287514 created "2016-06-24" @default.
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• W1966287514 date "2000-10-01" @default.
• W1966287514 modified "2023-09-27" @default.
• W1966287514 title "Relative binding affinity does not predict biological response to xenoestrogens in rat endometrial adenocarcinoma cells" @default.
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• W1966287514 doi "https://doi.org/10.1016/s0960-0760(00)00092-3" @default.
• W1966287514 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11086226" @default.
• W1966287514 hasPublicationYear "2000" @default.
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