Add time:07/22/2019 Source:sciencedirect.com
Anordiol (cas 1045-29-0), the dihydroxylated metabolite of anordrin, is an antiestrogen with estrogenic activity that is known to inhibit fertility. The following study was conducted to determine the mechanism of this antifertility effect. Anordiol was administered orally to rats, prior to implantation, on Day 2 of pregnancy. Control animals were treated with the vehicle only. The effectiveness of the agent in terminating pregnancy was determined on Day 14 of pregnancy. Anordiol was 100% effective in abolishing pregnancy at a dose of 0.6 mg/Kg. Administration of smaller doses resulted in a decreased number of implanting embryos, in a dose-dependent manner. An additional dose of anordiol on Day 3 of pregnancy yielded similar results. To determine whether pregnancy impairment by anordiol is exerted via the embryo or via the uterus, reciprocal embryo transfers were performed. Day 5 blastocysts were transferred into the uteri of pseudopregnant rats. In one set of experiments, the donor rats were treated with anordiol, and in the second set the recipient rats were treated. The results indicate that the effects of anordiol administration are exerted via the embryo as well as the uterus.
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