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Neuroglia: biophysical properties and physiologic function.

M C Trachtenberg, D A Pollen

    Science (New York, N.Y.)
    |February 27, 1970
    PubMed
    Summary
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    Neocortical glial cells have a rapid membrane time constant, enabling them to effectively buffer extracellular potassium during neural activity. This function is crucial for maintaining synaptic integrity and neuronal function.

    Area of Science:

    • Neuroscience
    • Cellular Biology
    • Biophysics

    Background:

    • Neocortical glial cells play a vital role in brain function.
    • Understanding their electrical properties is key to comprehending neural network dynamics.

    Purpose of the Study:

    • To characterize the membrane time constant and specific resistance of neocortical glial cells.
    • To elucidate the functional implications of these properties for potassium ion buffering.

    Main Methods:

    • Electrophysiological recordings were used to measure glial cell membrane properties.
    • Analysis focused on membrane time constant and specific resistance.

    Main Results:

    • The membrane time constant of neocortical glial cells was found to be approximately 385 microseconds.

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  • Glial membrane specific resistance is low, ranging from 200 to 500 ohm centimeters squared.
  • These values are significantly different from those of Betz cells.

    • Conclusions:

    • Neocortical glial cells possess electrical properties that make them highly effective at buffering extracellular potassium.
    • Their rapid response time and low resistance facilitate the buffering of potassium increases at synaptic sites.
    • This buffering action is essential for preventing excessive potassium spread and maintaining stable neuronal signaling.