Pregnant Mare's Serum Gonadotropin. IV. Induction of Premature Labor by Pregnant Mare's Serum Gonadotropin and its Prevention by using Clomiphene or Indomethacin**Supported by a grant from the Indian Council of Medical Research; Grant M76.18 from The Population Council, New York; and grants from ... (original) (raw)

Fertility and Sterility, 1978

Abstract

The administration of pregnant mare's serum gonadotropin (PMSG), 30 IU on day 18 of pregnancy, resulted in premature labor in rats. However, this abortifacient efficacy of PMSG was not demonstrable when a simultaneous injection of progesterone, clomiphene, or indomethacin was scheduled, thus suggesting that the action of PMSG is medicated by the estrogen-stimulated release of prostaglandin. The termination of pseudopregnancy in bilaterally hysterectomized rats by PMSG and its reversal by indomethacin revealed that the inhibition of luteal function by PMSG does not require the presence of a uterus.

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