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Ovarian hyperstimulation in rats

E S Lindenbaum, P Bar Sela, J Itzkovitz

    European Journal of Obstetrics, Gynecology, and Reproductive Biology
    |September 1, 1980
    PubMed
    Summary
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    Researchers induced mild ovarian hyperstimulation in rats using gonadotropins. Despite cellular changes, prolactin levels remained unchanged, indicating the rat model is unsuitable for studying human hyperstimulation syndrome.

    Area of Science:

    • Reproductive Endocrinology
    • Ovarian Physiology
    • Hormonal Regulation

    Background:

    • Ovarian hyperstimulation syndrome (OHSS) is a potential complication of assisted reproductive technologies.
    • Understanding the pathogenesis of OHSS is crucial for improving patient safety.

    Purpose of the Study:

    • To investigate the induction of mild ovarian hyperstimulation in rats.
    • To assess the effect of gonadotropin induction on prolactin levels.
    • To evaluate the suitability of the rat model for studying human OHSS.

    Main Methods:

    • Female rats were treated with human menopausal gonadotropin (HMG) followed by human chorionic gonadotropin (HCG).
    • Ovarian response was assessed via weight changes and histological examination.
    • Hypophyseal prolactin cell activity was examined using electron microscopy.

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  • Serum prolactin levels were measured using radioimmunoassay.

    • Main Results:

    • All treated rats exhibited ovarian hyperstimulation (3-4 times normal size) with increased corpora lutea, follicular cysts, and hemorrhagic cysts.
    • Mild edematous changes were noted in the lungs; other visceral organs were unaffected.
    • Electron microscopy suggested increased prolactin cell activity, but serum prolactin levels did not differ between groups.
    • Higher gonadotropin doses did not alter findings; only mild OHSS (Grade 2) was achieved.

    Conclusions:

    • The rat model successfully developed mild OHSS but did not show altered serum prolactin levels.
    • The rat experimental model is not comparable to human OHSS and cannot be used to study its pathogenesis.
    • Further research is needed to identify suitable animal models for OHSS pathogenesis studies.