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Related Experiment Videos

Dermorphin stimulates prolactin secretion in the rat.

D Giudici, R D'Urso, P Falaschi

    Neuroendocrinology
    |September 1, 1984
    PubMed
    Summary

    Dermorphin, an opioid peptide from amphibian skin, stimulates prolactin (Prl) release in male rats. This effect is dose-dependent and blocked by the opioid antagonist naloxone, indicating a specific opioid receptor interaction.

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    Area of Science:

    • Endocrinology
    • Neuroscience
    • Pharmacology

    Background:

    • Prolactin (Prl) is a key hormone regulating reproduction and other physiological processes.
    • Opioid peptides are known to influence hormone secretion, but their specific effects on Prl require further investigation.
    • Dermorphin, a potent opioid peptide from amphibian skin, has potential neuroendocrine effects.

    Purpose of the Study:

    • To investigate the effect of dermorphin on prolactin release in vivo and in vitro.
    • To determine the dose-dependency and receptor specificity of dermorphin's action on prolactin secretion.
    • To explore the role of opioid receptors in mediating dermorphin-induced prolactin release.

    Main Methods:

    • Subcutaneous and intraventricular administration of dermorphin to male rats.

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  • Administration of the opioid antagonist naloxone to assess receptor involvement.
  • Measurement of serum prolactin levels at various time points post-administration.
  • Experiments conducted on both normal and orchidectomized rats.

    • Main Results:

    • Subcutaneous dermorphin induced a dose-related increase in serum prolactin levels.
    • Intraventricular dermorphin stimulated prolactin release, with effects varying by dose and time.
    • Naloxone completely blocked dermorphin-induced prolactin elevation, confirming opioid receptor mediation.
    • Orchidectomized rats showed a delayed prolactin response to intraventricular dermorphin.

    Conclusions:

    • Dermorphin stimulates prolactin release through opioid receptors.
    • The effect of dermorphin on prolactin is dose-dependent and influenced by the route of administration.
    • Opioid signaling pathways play a significant role in regulating prolactin secretion.