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Related Experiment Videos

Opioid activity released from cat spinal cord by sciatic nerve stimulation.

F Nyberg, T L Yaksh, L Terenius

    Life Sciences
    |January 1, 1983
    PubMed
    Summary

    Sciatic nerve stimulation releases multiple endorphins in the spinal cord, including enkephalins and dynorphins. These findings indicate the activation of distinct spinal cord endorphin systems by somatic input.

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    Area of Science:

    • Neuroscience
    • Neurochemistry
    • Spinal Cord Physiology

    Background:

    • Endorphins are endogenous opioid peptides involved in pain modulation.
    • The specific endorphin systems activated by somatic stimulation in the spinal cord remain incompletely understood.

    Purpose of the Study:

    • To investigate the release and identity of endorphins from the cat spinal cord during sciatic nerve stimulation.
    • To determine if enkephalin and dynorphin systems are activated by peripheral nerve stimulation.

    Main Methods:

    • Spinal superfusion in anesthetized cats.
    • Fractionation of superfusates using Sephadex G-10 chromatography, electrophoresis, and High-Performance Liquid Chromatography (HPLC).
    • Endorphin activity measurement via radioreceptor and radioimmunoassays, including enzymatic digestion studies.

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    Main Results:

    • Sciatic nerve stimulation induced the release of at least three distinct endorphins.
    • One released endorphin co-migrated with [Met]enkephalin-Lys6, confirmed by HPLC and radioimmunoassay.
    • Enzymatic digestion suggested enkephalin sequences in all three stimulated components.
    • Dynorphin concentrations were elevated during nerve stimulation.

    Conclusions:

    • Somatic stimulation activates at least two distinct spinal cord endorphin systems: enkephalin and dynorphin.
    • These findings highlight the functional presence and activation of multiple endogenous opioid pathways in the spinal cord.