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Related Experiment Videos

Electric footshock-induced changes in behavior and opioid receptor function.

T Nabeshima, K Matsuno, H Kamei

    Pharmacology, Biochemistry, and Behavior
    |November 1, 1985
    PubMed
    Summary

    Electric shock (ES) triggers analgesia and motor suppression by releasing opioid peptides. These effects, mediated by delta opioid receptors, were blocked by naloxone and dependent on synaptic membrane preparation.

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    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Electric shock (ES) is known to induce behavioral and biochemical changes.
    • Opioid peptides play a crucial role in modulating pain and motor functions.

    Purpose of the Study:

    • To investigate the role of opioid peptides in ES-induced analgesia and motor suppression.
    • To elucidate the involvement of delta opioid receptors in these ES-induced effects.

    Main Methods:

    • Rats were subjected to a specific electric shock (ES) schedule.
    • Behavioral changes (analgesia, motor suppression) and opioid receptor binding capacities were assessed.
    • Naloxone pretreatment was used to block ES-induced effects.
    • Synaptic membrane preparation and [3H]-D-ala2,L-met5-enkephalinamide ([3H]-DAMEA) binding assays were performed.

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    Main Results:

    • ES induced significant analgesia, motor suppression, and altered opioid receptor binding.
    • Naloxone pretreatment blocked these ES-induced behavioral and biochemical changes.
    • Preincubation of synaptic membranes was necessary for observing ES-induced functional changes, suggesting a role in receptor binding or peptide release.
    • ES application led to a decrease in [3H]-DAMEA specific binding, indicating the release and binding of endogenous delta-type opioid peptides.

    Conclusions:

    • ES-induced behavioral and biochemical changes are mediated by the release of opioid peptides.
    • ES-induced analgesia is likely mediated by high-affinity delta opioid receptors.