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Related Experiment Videos

Endogenous opiates modulate pulsatile luteinizing hormone release in humans.

J F Ropert, M E Quigley, S S Yen

    The Journal of Clinical Endocrinology and Metabolism
    |March 1, 1981
    PubMed
    Summary

    Endogenous opioid peptides inhibit luteinizing hormone (LH) secretion during the menstrual cycle. Blocking opioid receptors with naloxone increased LH pulse frequency and amplitude, suggesting opioid involvement in neuroendocrine control.

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    Area of Science:

    • Neuroendocrinology
    • Reproductive Endocrinology
    • Opioid Peptide Signaling

    Background:

    • Endogenous opioid peptides are implicated in neuroendocrine regulation.
    • The luteal phase of the menstrual cycle is characterized by specific patterns of LH secretion.

    Purpose of the Study:

    • To investigate the role of endogenous opioid peptides in controlling luteinizing hormone (LH) pulse frequency and amplitude.
    • To determine if opioid receptor blockade alters LH secretion patterns during the luteal phase.

    Main Methods:

    • Sequential infusion of saline and naloxone (opioid receptor antagonist) in six normal cycling women.
    • Infusions were conducted over 6-hour intervals during the luteal phase.
    • LH and FSH levels were monitored to assess pulse frequency and amplitude.

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    Main Results:

    • Naloxone infusion significantly increased both the frequency and amplitude of LH pulses (P < 0.01).
    • A significant increment in FSH levels was observed concurrently with increased LH.
    • These findings indicate a modulatory effect of opioid activity on gonadotropin secretion.

    Conclusions:

    • Endogenous opiates, likely via inhibition of hypothalamic Luteinizing Releasing Factor (LRF), contribute to the low frequency of episodic LH secretion in the luteal phase.
    • Opioid peptides play a crucial role in the neuroendocrine regulation of the menstrual cycle.
    • Targeting opioid pathways may offer insights into reproductive endocrine disorders.