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Related Experiment Videos

Anorexia elicited by different catecholamines in rats.

M Russek1, C Vega, J Barrera

  • 1National School of Biological Sciences, IPN, Mexico City.

Appetite
|October 1, 1987
PubMed
Summary
This summary is machine-generated.

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Adrenaline and other catecholamines reduce food intake by acting on liver receptors. Adrenaline

Area of Science:

  • Neuroscience
  • Endocrinology
  • Physiology

Background:

  • Adrenaline (A) is known to cause significant appetite suppression.
  • This effect may involve adrenergic receptors located on liver cells (hepatocytes).

Purpose of the Study:

  • To investigate whether alpha- and/or beta-adrenergic mechanisms mediate the anorexic effects of adrenaline.
  • To compare the anorexigenic potencies of adrenaline, noradrenaline (NA), and isoproterenol (I) under various feeding and light/dark cycle conditions.

Main Methods:

  • Intraperitoneal injections of adrenaline, noradrenaline, and isoproterenol were administered to rats.
  • Experiments were conducted under four conditions: ad libitum feeding during the dark period, a 24h-feeding/24h-fasting schedule during dark and light periods, and after a 24h fast.

Related Experiment Videos

  • The anorexigenic effects were quantified by measuring food intake.

    • Main Results:

    • All three catecholamines reduced food intake, with adrenaline showing a slightly stronger effect.
    • The anorexic effects were more pronounced during the dark period compared to the light period.
    • Relative potencies varied: Adrenaline > Isoproterenol > Noradrenaline in the dark (II), and Adrenaline > Isoproterenol = Noradrenaline in the light (III) and after fasting (IV).
    • Alpha and beta adrenergic effects appeared additive, but adrenaline was more potent than a combination of noradrenaline and isoproterenol, suggesting a distinct mechanism.

    Conclusions:

    • Adrenaline's potent anorexic effect is mediated by hepatic adrenergic receptors.
    • While alpha and beta mechanisms contribute, adrenaline likely acts through a distinct, non-alpha/beta adrenergic pathway on these receptors.
    • Feeding schedules and light/dark cycles influence catecholamine-induced appetite suppression.