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  • Title: Pregnant mare's serum gonadotropin. IV. Induction of premature labor by pregnant mare's serum gonadotropin and its prevention by using clomiphene or indomethacin.
    Author: Basu R, Chatterjee A.
    Journal: Fertil Steril; 1978 Jun; 29(6):640-2. PubMed ID: 658475.
    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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