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• W1964722703 abstract "RU486 is a partial progesterone and estrogen receptor antagonist, functioning to actively silence progesterone receptor gene-associated transcription. For this reason, it has been used as both a contraceptive and an abortive agent. In the present study, cellular and gene specific effects of RU486 were investigated in a rat model of early pregnancy, including key phases of the window of receptivity and early implantation. As these stages are hormonally regulated by progesterone and estrogens, the focus here was to elucidate the mechanism of action of a single dose of RU486, used as a postcoital contraceptive, to successfully prevent implantation of a viable blastocyst. Immunofluorescent techniques were used to examine the change in protein levels of PR in RU486-treated endometria at days 4.5, 5.5 and 6.5 of pregnancy. Changes in the Pgr gene expression level as a consequence of RU486 administration was evaluated using quantitative real-time reverse transcription polymerase chain reaction. The progesterone receptor gene and protein expression was ubiquitously decreased throughout pregnancy as a direct consequence of RU486 administration. The overall effects of postcoital RU486 administration during early pregnancy indicate highly effective inhibition of progesterone and estrogen effects on the endometrium, mediated by their receptors. More specifically, the expression and localization of the progesterone receptor mirrors that described in ovariectomized animal models, suggesting a hormonally under-stimulated endometrium. Clearly from the present study, the precise priming of the endometrium by progesterone, in preparation for blastocyst implantation, is severely impaired by RU486, thus predisposing the uterus to pregnancy failure." @default.
• W1964722703 created "2016-06-24" @default.
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• W1964722703 creator A5082838076 @default.
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• W1964722703 date "2014-09-01" @default.
• W1964722703 modified "2023-09-27" @default.
• W1964722703 title "Postcoital administration of RU486 induces a hormonally under-stimulated rat endometrium" @default.
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• W1964722703 doi "https://doi.org/10.1016/j.repbio.2014.04.005" @default.
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