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Related Experiment Videos

Gamma-melanotropin and brain function.

J M van Ree, B Bohus, K M Csontos

    Ciba Foundation Symposium
    |January 1, 1981
    PubMed
    Summary
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    Nature·2010

    Gamma-melanocyte-stimulating hormone (gamma-MSH) exhibits distinct behavioral effects opposite to ACTH-like peptides, potentially acting as an opiate antagonist. It attenuates beta-endorphin effects and reduces heroin self-administration.

    Area of Science:

    • Neuroendocrinology
    • Behavioral Neuroscience
    • Pharmacology

    Background:

    • Pro-opiocortin (ACTH/MSH) peptides share structural similarities with gamma-melanocyte-stimulating hormone (gamma-MSH).
    • ACTH/MSH-related neuropeptides influence various behavioral processes.
    • The behavioral profile of gamma-MSH remains largely unexplored in comparison to related peptides.

    Purpose of the Study:

    • To investigate the behavioral effects of gamma-MSH.
    • To compare the behavioral actions of gamma-MSH with ACTH/MSH-type peptides and opiate modulators.
    • To explore the potential interaction of gamma-MSH with the endogenous opioid system.

    Main Methods:

    • Behavioral testing in rats, focusing on avoidance behavior and grooming.
    • Administration of gamma-MSH and related peptides into specific brain regions (periaqueductal gray).

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  • In vitro assays examining receptor binding (naloxone displacement) and effects on isolated muscle preparations (guinea-pig ileum, rat rectum).

    • Main Results:

    • Gamma-MSH demonstrated opposing effects to ACTH-like peptides on avoidance behavior.
    • Gamma-MSH attenuated ACTH(1-24)-induced excessive grooming and elicited opiate withdrawal-like symptoms.
    • Gamma-MSH counteracted several beta-endorphin effects, including antinociception and hypothermia, and reduced heroin self-administration acquisition.

    Conclusions:

    • Gamma-MSH exhibits a unique behavioral profile distinct from ACTH/MSH peptides, resembling opiate antagonists.
    • Gamma-MSH may functionally antagonize beta-endorphin effects, possibly via specific gamma-MSH receptors.
    • These findings suggest a role for gamma-MSH in modulating opioid-related behaviors and physiological responses.