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Evidence that a decrease in opioid tone may evoke preovulatory luteinizing hormone release in the rat.

L G Allen, S P Kalra

    Endocrinology
    |June 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    Naloxone (NAL) treatment can advance the luteinizing hormone (LH) surge in rats. Blocking opioid inhibition with NAL before the critical period on proestrus induces premature LH release, supporting the opioid tone hypothesis.

    Area of Science:

    • Neuroendocrinology
    • Reproductive Biology
    • Pharmacology

    Background:

    • The preovulatory luteinizing hormone (LH) surge is a critical event in the female reproductive cycle.
    • Endogenous opioids are known to inhibit LH secretion.
    • Naloxone (NAL), an opioid antagonist, has been investigated for its effects on reproductive hormone release.

    Purpose of the Study:

    • To investigate the effects of prolonged naloxone (NAL) treatment on LH release prior to the natural proestrus surge.
    • To determine if blocking opioid inhibition can advance the timing of the preovulatory LH surge.
    • To explore the role of inhibitory opioid tone in the regulation of the LH surge.

    Main Methods:

    • Continuous intravenous infusion of naloxone (NAL) at different times before and during the critical period on proestrus in rats.

    Related Experiment Videos

  • Monitoring of LH secretion at 5-minute intervals.
  • Subcutaneous implantation of NAL pellets to assess sustained blockade of opioid receptors.

    • Main Results:

    • Continuous NAL infusion initiated at 1000 h resulted in variable LH responses, with some rats showing a delayed but significant surge.
    • Initiating NAL infusion at 1200 h or implanting NAL pellets at 0930 h provoked premature LH surges with magnitudes comparable to normal preovulatory surges.
    • These findings suggest that sustained opioid receptor blockade can advance the LH surge.

    Conclusions:

    • A sustained blockade of inhibitory opioid tone using naloxone can elicit the LH surge before the critical period on proestrus.
    • These results support the hypothesis that the neural mechanisms controlling the preovulatory LH surge involve a transient decrease in inhibitory opioid activity.
    • The findings provide insights into the neuroendocrine regulation of ovulation and the role of opioids in reproductive timing.