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Phasic ion channel blockade. A kinetic model and parameter estimation procedure.

C F Starmer, A O Grant

    Molecular Pharmacology
    |October 1, 1985
    PubMed
    Summary
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    This study introduces "guarded receptors" like ion channels, whose drug access is transient. A new model characterizes ion channel blockade, aiding the development of drugs like local anesthetics.

    Area of Science:

    • Pharmacology
    • Biophysics
    • Computational Biology

    Background:

    • Excitable membranes exhibit frequency-dependent drug incorporation into ion channels with stimulation.
    • Ligand access to traditional receptors is continuous, unlike gated ion channels.

    Purpose of the Study:

    • To define and model "guarded receptors" with transient ligand access.
    • To develop a quantitative strategy for characterizing ion channel blockers.

    Main Methods:

    • Developed a first-order ligand-receptor binding model for ion channel blockade.
    • Derived steady-state channel blockade for guarded receptors under repetitive stimulation.
    • Proposed data analysis tools for characterizing ion channel-blocking agents.

    Main Results:

    Related Experiment Videos

    • Ion channel blockade follows an exponential time course dependent on multiple factors.
    • The model characterizes blockade via a single diffusion path under phasic stimulation.
    • Steady-state properties of guarded receptors approach continuous access models with increased receptor access time.

    Conclusions:

    • The derived analysis tools simplify the description of ion channel blocker properties.
    • The model has general applicability for periodically accessible receptors.
    • This work aids in understanding and developing drugs like local anesthetics and antiarrhythmics.