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Fasting associated with decrease in hypothalamic beta-endorphin.

S R Gambert, T L Garthwaite, C H Pontzer

    Science (New York, N.Y.)
    |December 12, 1980
    PubMed
    Summary
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    Fasting rats showed lower hypothalamic beta-endorphin levels but unchanged adrenocorticotropin. This suggests endogenous opiates play a role in the body's adaptation to fasting.

    Area of Science:

    • Neuroendocrinology
    • Physiology

    Background:

    • The body adapts to fasting through complex hormonal and neural mechanisms.
    • Endogenous opiates, like beta-endorphin, are involved in stress and metabolic regulation.

    Purpose of the Study:

    • To investigate the effects of fasting on beta-endorphin and adrenocorticotropin levels in rat hypothalamus and pituitary.
    • To explore the potential role of endogenous opiates in the physiological response to fasting.

    Main Methods:

    • Rats were subjected to a fasting period of 2 to 3 days.
    • Hypothalamic and pituitary levels of beta-endorphin and adrenocorticotropin were measured.

    Main Results:

    • Fasting led to a significant decline in hypothalamic beta-endorphin content.

    Related Experiment Videos

  • No significant changes were observed in pituitary beta-endorphin or adrenocorticotropin levels in either the hypothalamus or pituitary.
  • Pituitary and hypothalamic adrenocorticotropin content remained stable during the fasting period.

    • Conclusions:

    • The study indicates that hypothalamic beta-endorphin is sensitive to short-term fasting in rats.
    • These findings suggest that endogenous opiates may be involved in the physiological adaptation to fasting.
    • Further research is warranted to elucidate the precise mechanisms linking fasting, beta-endorphin, and metabolic adaptation.