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Biology of Reproduction, Vol 3, 201-204, Copyright © 1970 by Society for the Study of Reproduction

The Effect on Implantation of Culturing Delayed Rat Blastocysts in Medium Containing 17beta-Estradiol

J. T. WU 1, and R. K. MEYER 1

1 Department of Zoology, University of Wisconsin, Madison, Wisconsin 53706


The present experiments were designed to determine whether estrogen acts directly on the blastocyst during implantation. Delayed blastocysts, obtained from ovariectomized rats treated daily with progesterone, were cultured in vitro with or without 17beta-estradiol. They were either washed or not washed, and transferred to recipients that were ovariectomized 14 days earlier and given daily injections of progesterone. The blastocysts did not implant. However, if the recipients were primed with a dose of estrogen normally insufficient to induce implantation, the unwashed estrogen-treated blastocysts implanted, but the washed blastocysts and the estrogen-free controls did not.

These experiments failed to demonstrate a direct effect of estradiol on the ability of the blastocyst to implant in the uteri of ovariectomized rats treated with progesterone and a subminimal dose of estrone.

 Submitted on May 26, 1970




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