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Related Experiment Videos

Spinal opiates affect sexual behaviour in rats.

Z Wiesenfeld-Hallin, P Södersten

    Nature
    |May 17, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Spinal opiates, not those in the brain, influence sexual behavior. This study shows that morphine inhibits sexual receptivity in female rats, while naloxone enhances it, demonstrating the role of spinal opioid receptors.

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    Area of Science:

    • Neuroscience
    • Reproductive Biology
    • Pharmacology

    Background:

    • Enkephalin cells in the spinal cord's substantia gelatinosa process pain.
    • Spinal opiates may influence reproductive sensory stimuli perception.
    • Cervical probing in rats induces analgesia and stimulates sexual behavior, partly via spinal opiates.

    Purpose of the Study:

    • To investigate the role of spinal opiates in regulating sexual behavior.
    • To determine if spinal opioid receptor mechanisms influence reproductive behaviors.

    Main Methods:

    • Intrathecal administration of morphine (opiate agonist) or naloxone (opiate antagonist) in ovariectomized rats pretreated with hormones.
    • Behavioral observation of sexual receptivity in females and mating behavior (intromissions before ejaculation) in males.

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  • Comparison with intraperitoneal injections to assess spinal vs. systemic effects.

    • Main Results:

    • Intrathecal morphine inhibited sexual receptivity in female rats, while naloxone enhanced it.
    • Intrathecal morphine increased intromissions before ejaculation in male rats; naloxone decreased them.
    • Morphine or naloxone administered intraperitoneally had no observed behavioral effects.

    Conclusions:

    • Sexual behavior is influenced by spinal opiates, not solely brain opiates.
    • Spinal opioid receptors play a significant role in modulating reproductive behaviors in rats.