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Physiology of paraneurons.

T Kanno

    Archivum Histologicum Japonicum = Nihon Soshikigaku Kiroku
    |January 1, 1977
    PubMed
    Summary

    This review explains paraneuron function, detailing their three-phase secretory process: secretion, transmission, and reversion. Paraneurons exhibit distinct behaviors during active secretion and transmission phases, involving stimulus reception, excitation conduction, and substance extrusion.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Endocrinology

    Background:

    • Paraneurons are cells with neuron-like and endocrine functions.
    • Their secretory processes share similarities with neurons and neurosecretory cells.
    • Understanding paraneuron function is crucial for comprehending intercellular communication.

    Purpose of the Study:

    • To elucidate the functional characteristics of paraneurons.
    • To detail the three main phases of paraneuron secretion: secretion, transmission, and reversion.
    • To explore the molecular mechanisms underlying stimulus-extrusion coupling in paraneurons.

    Main Methods:

    • Review of existing literature on paraneuron physiology.
    • Analysis of secretory processes, including steady and activated states.
    • Examination of membrane events during stimulus reception, excitation conduction, and substance extrusion.

    Main Results:

    • Paraneurons exhibit distinct behaviors in active secretion and transmission phases.
    • Stimulus-extrusion coupling involves stimulus reception, excitation conduction, and secretory substance extrusion.
    • Ionic fluxes (Na+, Ca++) and membrane potential changes are critical for activation.
    • Eccytosis is proposed as the mechanism for secretory granule extrusion.
    • Paracrine secretion, involving local action of substances like somatostatin and insulin, is a key transmission mode.

    Conclusions:

    • Paraneuron function is characterized by a distinct three-phase secretory cycle.
    • Specific membrane regions are involved in stimulus reception, excitation conduction, and substance extrusion.
    • Ionic dynamics and membrane events orchestrate the secretory response.
    • Paracrine signaling is a significant mode of communication mediated by paraneurons.

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