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Related Experiment Videos

Peptide YY (PYY), a potent orexigenic agent.

J E Morley, A S Levine, M Grace

    Brain Research
    |August 19, 1985
    PubMed
    Summary

    Peptide YY (PYY) strongly stimulates feeding and drinking, acting as a potent orexigenic substance. Chronic PYY administration leads to significant food intake without developing tolerance, suggesting a role in eating disorders.

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    Area of Science:

    • Neuroendocrinology
    • Appetite Regulation
    • Gastrointestinal Physiology

    Background:

    • Neuropeptide Y (NPY) is known to stimulate feeding.
    • Peptide YY (PYY) is a related peptide hormone involved in gastrointestinal functions.
    • The orexigenic (appetite-stimulating) effects of PYY require further elucidation.

    Purpose of the Study:

    • To compare the potency of central Peptide YY (PYY) and Neuropeptide Y (NPY) in stimulating feeding and drinking.
    • To investigate the effects of chronic PYY administration on food intake and the development of tolerance.
    • To assess the potential role of PYY in the pathophysiology of bulimic syndromes.

    Main Methods:

    • Central administration of Peptide YY (PYY) and Neuropeptide Y (NPY) in a controlled experimental setting.
    • Chronic administration of PYY every 6 hours for 48 hours.
    • Measurement of food ingestion and assessment for tolerance development.

    Main Results:

    • Central administration of PYY demonstrated more potent feeding and drinking enhancement than NPY.
    • Chronic PYY administration resulted in massive food ingestion.
    • No tolerance to the orexigenic effects of PYY was observed during the study period.

    Conclusions:

    • Peptide YY (PYY) is identified as one of the most potent orexigenic substances discovered to date.
    • The lack of tolerance suggests sustained PYY activity can lead to significant food intake.
    • PYY may be implicated in the pathogenesis of eating disorders, including bulimic syndromes.

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