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Related Experiment Videos

Morphine presynaptically inhibits a ganglionic cholinergic synapse.

J C Bornstein, H L Fields

    Neuroscience Letters
    |November 1, 1979
    PubMed
    Summary
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    Morphine reduces synaptic transmission in the inferior mesenteric ganglion (IMG) by decreasing quantal content. Naloxone

    Area of Science:

    • Neuroscience
    • Pharmacology
    • Physiology

    Background:

    • The inferior mesenteric ganglion (IMG) plays a crucial role in regulating gastrointestinal functions.
    • Understanding the modulatory effects of opioids on autonomic ganglia is essential for pain management and understanding gut motility.
    • Opiate receptors are known to exist in the central nervous system, but their presence and function in peripheral autonomic ganglia require further elucidation.

    Purpose of the Study:

    • To investigate the effects of morphine on synaptic transmission within the inferior mesenteric ganglion (IMG).
    • To determine the specific mechanisms by which morphine influences neurotransmission in this peripheral ganglion.
    • To explore the potential presence and role of opiate receptors in the preganglionic nerve terminals of the IMG.

    Main Methods:

    Related Experiment Videos

    • Intracellular recording techniques were employed to study synaptic potentials in the IMG.
    • Dose-response relationships for morphine were established.
    • The effects of morphine were assessed in the presence and absence of naloxone, a known opiate antagonist.

    Main Results:

    • Morphine caused a reversible and dose-dependent reduction in the quantal content of synaptic potentials.
    • Morphine had minimal to no impact on quantal size or the intrinsic properties of IMG cells.
    • Naloxone effectively antagonized the effects of morphine, indicating a receptor-mediated action.

    Conclusions:

    • Morphine modulates synaptic transmission in the IMG by reducing neurotransmitter release (quantal content).
    • The findings strongly suggest the presence of specific preganglionic opiate receptors in the IMG.
    • This study provides evidence for a direct peripheral action of opioids on autonomic ganglia, impacting gut function.