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Related Experiment Videos

The morphine effect on plasma ANF.

J Gutkowska, K Racz, R Garcia

    European Journal of Pharmacology
    |November 12, 1986
    PubMed
    Summary
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    Morphine significantly increases atrial natriuretic factor (ANF) in rats, an effect blocked by naloxone. This suggests morphine

    Area of Science:

    • Endocrinology
    • Pharmacology
    • Physiology

    Background:

    • Atrial natriuretic factor (ANF) is a hormone regulating fluid balance.
    • Morphine is known to affect fluid balance, but its mechanism is unclear.

    Purpose of the Study:

    • To investigate the effect of acute morphine administration on plasma immunoreactive ANF (IR-ANF) levels.
    • To determine the role of opioid receptors in mediating morphine's effect on IR-ANF.

    Main Methods:

    • Measuring plasma IR-ANF in conscious, non-hydrated rats following acute morphine treatment.
    • Assessing the impact of naloxone, an opioid antagonist, on morphine-induced IR-ANF changes.
    • Administering saline infusions to evaluate IR-ANF responses in naloxone-pretreated and control groups.

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    Main Results:

    • Morphine caused an eight-fold increase in plasma IR-ANF.
    • Naloxone completely abolished the morphine-induced IR-ANF elevation.
    • Naloxone significantly reduced basal IR-ANF levels, suggesting endogenous opioid involvement.

    Conclusions:

    • Morphine-induced increase in plasma IR-ANF may explain its diuretic effect in rats.
    • Endogenous opioids might play a role in regulating basal ANF secretion.