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Related Experiment Videos

Prolactin release by vasoactive intestinal polypeptide in rats

Y Kato, Y Iwasaki, J Iwasaki

    Endocrinology
    |August 1, 1978
    PubMed
    Summary

    Synthetic vasoactive intestinal polypeptide (VIP) increases prolactin (PRL) in rats, partly via opiate receptors. VIP also blocks dopamine

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    Area of Science:

    • Neuroendocrinology
    • Hormone Regulation
    • Neuropharmacology

    Background:

    • Vasoactive intestinal polypeptide (VIP) is a neuropeptide with diverse physiological roles.
    • Prolactin (PRL) secretion is tightly regulated by central and peripheral mechanisms.
    • The interplay between VIP, opioid receptors, and dopaminergic pathways in PRL regulation requires further elucidation.

    Purpose of the Study:

    • To investigate the role of VIP in regulating prolactin (PRL) secretion in rats.
    • To determine the involvement of opiate and dopaminergic systems in VIP-induced PRL release.

    Main Methods:

    • Administration of synthetic VIP intraventricularly and intravenously in urethane-anesthetized rats.
    • Assessment of plasma PRL levels following VIP administration and co-administration with receptor antagonists/agonists (naloxone, L-dopa).
    • In vitro studies using cultured pituitary cells to evaluate VIP's effect on dopamine-induced PRL inhibition.

    Main Results:

    • Synthetic VIP caused a significant, dose-related increase in plasma PRL levels.
    • Naloxone, an opiate receptor antagonist, significantly blunted the PRL response to VIP.
    • L-dopa suppressed VIP-induced PRL increases, while other tested agents had no effect.
    • In vitro, VIP attenuated dopamine's inhibitory effect on PRL release from pituitary cells.

    Conclusions:

    • VIP stimulates rat PRL secretion, at least partially through central opiate receptor activation.
    • VIP may also stimulate PRL by inhibiting the dopaminergic control at the pituitary level.
    • These findings highlight a complex neuroendocrine interaction involving VIP, opioids, and dopamine in PRL regulation.

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