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Morphine: dual effects on plasma catecholamines

G J Taborsky, J B Halter, D Porte

    Endocrinology
    |July 1, 1981
    PubMed
    Summary
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    Morphine

    Area of Science:

    • Pharmacology
    • Neuroscience
    • Endocrinology

    Background:

    • Plasma catecholamines, including epinephrine and norepinephrine, are critical stress response mediators.
    • Morphine's effects on catecholamine levels are complex and not fully understood.
    • Previous research indicates variable responses to opioid administration.

    Purpose of the Study:

    • To investigate the dose-dependent and condition-specific effects of morphine on plasma catecholamine levels in dogs.
    • To elucidate the mechanisms underlying morphine's influence on epinephrine and norepinephrine.
    • To differentiate between the analgesic and central nervous system effects of morphine on catecholamine release.

    Main Methods:

    • Administering different doses of morphine (30 mg s.c. vs. 15 mg i.v.) to conscious and anesthetized dogs.

    Related Experiment Videos

  • Utilizing laparotomy as a variable experimental condition in anesthetized dogs.
  • Measuring plasma concentrations of epinephrine and norepinephrine under various experimental conditions.

    • Main Results:

    • In conscious dogs, subcutaneous morphine (30 mg) significantly elevated plasma epinephrine but not norepinephrine.
    • In anesthetized, laparotomized dogs, intravenous morphine (15 mg) attenuated the rise in both plasma epinephrine and norepinephrine.
    • No significant changes in plasma catecholamines were observed with either morphine dose in non-laparotomized, anesthetized dogs.

    Conclusions:

    • Morphine's effect on plasma catecholamines is highly dependent on dosage and experimental context.
    • The catecholamine-lowering effect of morphine appears linked to its analgesic properties.
    • The catecholamine-elevating effect may result from the activation of specific central nervous system pathways, which are inhibited by barbiturate anesthesia.