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Modulation of extracellular calcium and its functional implications.

C Nicholson

    Federation Proceedings
    |April 1, 1980
    PubMed
    Summary

    Extracellular calcium ([Ca2+]0) decreases during neuronal activity, especially during spreading depression and anoxia. These calcium changes impact neuronal excitability and synaptic transmission, offering insights into nervous system function.

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    Area of Science:

    • Neuroscience
    • Neurophysiology

    Background:

    • Extracellular calcium ([Ca2+]0) influences axonal excitability and synaptic transmission.
    • Calcium ions (Ca2+) are integral to dendritic action potentials, suggesting [Ca2+]0 affects dendritic function.

    Purpose of the Study:

    • To investigate the impact of extracellular calcium changes on neuronal function.
    • To quantify [Ca2+]0 variations during neuronal activity, spreading depression, and anoxia.

    Main Methods:

    • Utilized Ca2+-specific ion-selective microelectrodes to measure [Ca2+]0 in stimulated neuronal ensembles.
    • Analyzed diffusion characteristics of Ca2+ in the extracellular space.

    Main Results:

    • Observed significant decreases in [Ca2+]0 in stimulated neuronal ensembles, amplified during spreading depression and anoxia.
    • Attributed [Ca2+]0 decreases to Ca2+ influx into cells during activity.
    • Compiled numerical estimates indicating lowered neuronal excitability thresholds and reduced synaptic transmission due to decreased [Ca2+]0.

    Conclusions:

    • Changes in [Ca2+]0 significantly modulate neuronal excitability and synaptic transmission under specific conditions.
    • Variations in [Ca2+]0 serve as a valuable indicator of Ca2+-mediated processes within the nervous system.

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