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Luteal function in hypophysectomized rhesus monkeys

R H Asch, M Abou-Samra, G D Braunstein

    The Journal of Clinical Endocrinology and Metabolism
    |July 1, 1982
    PubMed
    Summary
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    The corpus luteum in rhesus monkeys can maintain function for about 10 days, even after pituitary removal. This suggests luteal independence from pituitary hormones like luteinizing hormone (LH).

    Area of Science:

    • Reproductive Endocrinology
    • Primate Physiology

    Background:

    • Corpus luteum (CL) maintenance is crucial for primate reproductive success.
    • The pituitary gland's role in regulating CL function requires further elucidation.

    Purpose of the Study:

    • To investigate the maintenance of corpus luteum function in rhesus monkeys following hypophysectomy.
    • To determine the dependency of the CL on pituitary hormones, specifically luteinizing hormone (LH).

    Main Methods:

    • A transfrontal microsurgical approach was employed for total hypophysectomy in rhesus monkeys.
    • Corpus luteum function was assessed in hypophysectomized and sham-operated animals.
    • Hormone levels (PRL, LH) were monitored via serum analysis.
    • Ovulation was induced using gonadotropins (hMG, hCG, hLH) in hypophysectomized subjects.

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    Main Results:

    • Complete hypophysectomy did not impair luteal function when performed one day post-ovulation.
    • Serum prolactin (PRL) became undetectable, and luteinizing hormone (LH) levels were minimal post-hypophysectomy.
    • Induced ovulation in hypophysectomized monkeys resulted in normal luteal function for approximately 10 days.

    Conclusions:

    • The primate corpus luteum, once formed, can function independently of the pituitary gland.
    • Circulating LH is not essential for the initial 10-day maintenance of corpus luteum function in rhesus monkeys.