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Induction of implantation in the rat by intraparametrial injection of actinomycin D.

Systemic administration of various doses of actinomycin D to ovariectomized pregnant rats treated with progesterone (P), was unable to induce implantation of 'delayed' blastocysts in a significant number of animals. However, under the same conditions, topical injection of this drug into the parametrium entailed the occurrence of implantation sites into the homolateral uterine horn in 71% of rats. It is concluded that actinomycin D precipitates implantation by acting directly on uterine cells. Intraparametrial injections of α-amanitin or cycloheximide did not elicit significant rates of implantation.