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Single ionic channels observed in tissue-cultured muscle.

D J Nelson, F Sachs

    Nature
    |December 20, 1979
    PubMed
    Summary

    Researchers used the extracellular patch clamp technique on chick skeletal muscle cells. They found no evidence of discontinuous behavior in channel conductance or gating kinetics across a temperature range of 17 to 37 degrees C.

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    Area of Science:

    • * Neuroscience
    • * Cellular Physiology
    • * Biophysics

    Background:

    • * The extracellular patch clamp technique is crucial for studying ion channel function.
    • * Previous studies suggested a two-state model for nicotinic endplate channels in skeletal muscle.

    Purpose of the Study:

    • * To apply the extracellular patch clamp technique to tissue-cultured chick skeletal muscle cells.
    • * To investigate the temperature dependence of single nicotinic channel conductance and gating kinetics.

    Main Methods:

    • * Extracellular patch clamp recordings from single channels.
    • * Utilized tissue-cultured chick skeletal muscle cells.
    • * Analyzed temperature effects on channel conductance and gating between 17 and 37°C.

    Main Results:

    • * Successfully recorded single-channel responses from chick skeletal muscle.
    • * Observed no discontinuous behavior in channel conductance.
    • * Gating kinetics showed no evidence of discontinuous behavior within the tested temperature range.

    Conclusions:

    • * The extracellular patch clamp technique is effective for studying skeletal muscle ion channels.
    • * Nicotinic channel behavior in chick skeletal muscle does not exhibit discontinuous temperature-dependent gating within the physiological range.

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