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Related Experiment Videos

Rhythmic membrane potential changes in hamster parasympathetic neurons.

T Suzuki, K Kusano

    Journal of the Autonomic Nervous System
    |July 1, 1983
    PubMed
    Summary

    Hamster submandibular neurons exhibit two rhythmic membrane potentials: slow oscillations (SOMP) and caffeine-induced hyperpolarizing potentials (C-HPs). These potentials are primarily driven by calcium-activated potassium conductance, influenced by mitochondrial activity.

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    Area of Science:

    • Neuroscience
    • Cell Physiology
    • Ion Channels

    Background:

    • Hamster submandibular neurons display complex rhythmic membrane potential activities.
    • Understanding these potentials is crucial for elucidating neuronal signaling mechanisms.

    Purpose of the Study:

    • To analyze two distinct rhythmic membrane potentials: slow oscillations of membrane potential (SOMP) and spontaneous or caffeine-induced rhythmic hyperpolarizing potentials (C-HPs).
    • To investigate the ionic mechanisms underlying SOMPs and C-HPs in hamster submandibular neurons.

    Main Methods:

    • Electrophysiological recordings of membrane potential in hamster submandibular neurons.
    • Pharmacological manipulation using potassium and calcium channel blockers, mitochondrial inhibitors, and a Na+-pump inhibitor.
    • Ionic concentration adjustments (K+ and Ca2+) in the extracellular saline.

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    Main Results:

    • SOMPs occurred spontaneously with a mean interval of 6 min and amplitude of 12 mV, influenced by median membrane potential and extracellular K+ and Ca2+ concentrations.
    • C-HPs were significantly affected by Ba2+ (K+-conductance blocker) and abolished by Ca2+-conductance blockers, mitochondrial inhibitors, ruthenium red, and quinine.
    • Intracellular Ca2+ injection induced transient hyperpolarization under specific membrane potential conditions.

    Conclusions:

    • Both SOMPs and C-HPs are proposed to be generated by an increase in Ca2+-activated K+ conductance (GK).
    • Mitochondrial calcium regulatory activity appears to control this Ca2+-activated GK.