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Transient development and function of rabbit corpora lutea after hypophysectomy.

K C Yuh, C H Bill, P L Keyes

    The American Journal of Physiology
    |December 1, 1984
    PubMed
    Summary
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    Pituitary hormones are not essential for early corpus luteum development in rabbits. Estradiol is crucial for maintaining corpus luteum function and structure after day 4 of pseudopregnancy.

    Area of Science:

    • Reproductive Endocrinology
    • Mammalian Reproduction
    • Hormonal Regulation

    Background:

    • The corpus luteum is vital for maintaining pregnancy.
    • Pituitary hormones are traditionally considered essential for corpus luteum function.
    • The specific role of estradiol in early corpus luteum development requires further elucidation.

    Purpose of the Study:

    • To investigate the necessity of the pituitary gland for early corpus luteum development in rabbits.
    • To determine the role of 17 beta-estradiol in sustaining corpus luteum function and structure.

    Main Methods:

    • Rabbits underwent hypophysectomy (pituitary removal) on day 1 post-mating.
    • Serum progesterone levels were monitored.
    • Luteal tissue was analyzed for weight, estrogen receptor, and luteinizing hormone (LH) receptor concentrations.

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  • Estradiol was administered via Silastic capsules to assess its rescue effect.

    • Main Results:

    • Hypophysectomized rabbits maintained normal progesterone for 2 days, with similar luteal weight and receptor concentrations on day 4 compared to controls.
    • Progesterone, luteal weight, and receptors declined significantly by day 6 in hypophysectomized rabbits without estradiol.
    • Estradiol administration successfully maintained progesterone, luteal weight, and receptor levels on day 6.

    Conclusions:

    • The pituitary gland is not required for the initial 3-4 days of corpus luteum development and function post-ovulation.
    • Estradiol becomes essential by day 4 to maintain the structural and functional integrity of the corpus luteum in rabbits.
    • These findings highlight a critical role for estradiol in luteal maintenance independent of pituitary support after the initial phase.