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Related Experiment Videos

Ovulation in rats is delayed by a substituted triazole.

M C Middleton, C M Milne, S Moreland

    Toxicology and Applied Pharmacology
    |April 1, 1986
    PubMed
    Summary

    The triazole R151885 delays ovulation in rats by temporarily suppressing the luteinizing hormone (LH) surge. This effect is reversible and occurs without significant toxicity, impacting estradiol levels and pituitary priming.

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    Area of Science:

    • Endocrinology
    • Reproductive Biology
    • Pharmacology

    Background:

    • The estrous cycle is a complex hormonal process regulating reproduction in female mammals.
    • Ovulation is triggered by a surge in luteinizing hormone (LH).
    • Understanding agents that modulate the estrous cycle is crucial for reproductive health research.

    Purpose of the Study:

    • To investigate the effects of the substituted triazole R151885 on the rat estrous cycle and ovulation.
    • To determine the hormonal mechanisms underlying R151885's action.
    • To assess the toxicity and reversibility of R151885's effects.

    Main Methods:

    • Administration of R151885 (5 or 25 mg/kg) orally to rats on diestrus-2.
    • Monitoring of estrous cycle progression and ovulation timing.

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  • Measurement of plasma hormone concentrations (progesterone, FSH, LH, estradiol).
  • Assessment of uterine response to estradiol in ovariectomized rats.

    • Main Results:

    • R151885 delayed ovulation by 24-48 hours in a dose-dependent manner.
    • No significant toxicity was observed at the tested doses.
    • R151885 delayed preovulatory peaks of progesterone, FSH, and LH, and reduced estradiol levels.
    • R151885 antagonized estradiol's action on the uterus.

    Conclusions:

    • R151885 temporarily suppresses the preovulatory LH surge, delaying ovulation.
    • Reduced estradiol levels and partial antagonism of estradiol action contribute to the suppressed LH surge.
    • The effects of R151885 on the hormonal control system are reversible.