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Nonselective ionic channels in Aplysia neurones.

D Chesnoy-Marchais, M G Evans

    The Journal of Membrane Biology
    |January 1, 1986
    PubMed
    Summary

    Ionic channels in Aplysia neurons exhibit unique selectivity, showing higher permeability to chloride than cesium ions. These channels also display varying conductance states and anion permeability, offering insights into neuronal ion transport.

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    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Biophysics

    Background:

    • Understanding ion channel selectivity is crucial for elucidating neuronal function.
    • Previous research has identified various ion channels in Aplysia neurons, but their precise properties remain under investigation.

    Purpose of the Study:

    • To characterize the ionic selectivity and conductance properties of channels in Aplysia neurons.
    • To investigate the influence of different external solutions on channel behavior.

    Main Methods:

    • Single-channel recordings from outside-out patches of Aplysia neurons in potassium-free solutions.
    • Reversal potential measurements and voltage ramp analysis to determine ion permeability and conductance.
    • Ionic substitutions using various cations (Cs+) and anions (Cl-, NO3-, isethionate, SO42-, methanesulfonate).

    Main Results:

    • Identified ionic channels with significant permeability to chloride over cesium (PCl/PCs = 4).
    • Observed altered cation-anion discrimination in the presence of external NaCl compared to mannitol.
    • Demonstrated higher permeability to nitrate than chloride, and appreciable permeability to isethionate, sulfate, and methanesulfonate.
    • Measured elementary conductance of approximately 100 pS in 600 mM symmetrical chloride.
    • Detected multiple conductance states (2-3) within the same membrane patch, with distinct reversal potentials.

    Conclusions:

    • Aplysia neuronal membrane harbors ionic channels with complex and surprising selectivity properties.
    • These channels exhibit differential permeability to various anions and cations, suggesting a role in neuronal excitability.
    • The presence of multiple conductance states indicates dynamic channel behavior that warrants further investigation.

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