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"Metabolic" action potentials in Acetabularia

D Gradmann

    The Journal of Membrane Biology
    |October 20, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Transient depolarizations in Acetabularia, identified as action potentials, are not caused by passive channels. Instead, an active electrogenic pump pathway, involving specific elements and capacity, controls these cellular events.

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    Area of Science:

    • Cellular electrophysiology
    • Plant cell biology

    Background:

    • Transient depolarizations in Acetabularia exhibit action potential characteristics.
    • Understanding the ionic mechanisms underlying these potentials is crucial.

    Purpose of the Study:

    • To investigate the mechanisms of action potentials in Acetabularia.
    • To analyze the role of membrane components in action potential generation.

    Main Methods:

    • Conductance measurements
    • Voltage clamp experiments
    • Analysis based on an analog membrane circuit model

    Main Results:

    • Action potentials do not result from passive diffusion channel permeability changes.
    • A model involving an electrogenic pump (EP), nonlinear elements (P1, P2), and capacity (CP) was proposed.

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  • The carrier system (P1) nonlinearity is constant, influencing time course, while P2 and CP likely control the action potential.

    • Conclusions:

    • Acetabularia action potentials are actively generated by an electrogenic pump.
    • Metabolic entities reflected by P2 and CP are suggested to regulate these action potentials.