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Biophysics of mechanoreception.

F Sachs

    Membrane Biochemistry
    |January 1, 1986
    PubMed
    Summary

    This study reveals that ion channels in various cells are sensitive to membrane tension. A quantitative model explains how channel gating is influenced by mechanical forces, suggesting a general mechanism for cellular mechanotransduction.

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    Area of Science:

    • Cellular Biophysics
    • Mechanobiology
    • Molecular Physiology

    Background:

    • Ion channels sensitive to membrane tension are present in diverse cell types, including skeletal, muscle, nerve, epithelial, and heart cells.
    • In chick skeletal muscle, this mechanosensitive transduction is intrinsic to excised membrane patches and does not involve chemical messengers.

    Purpose of the Study:

    • To quantitatively analyze the tension sensitivity of ion channels.
    • To develop a biophysical model explaining the gating mechanism of mechanosensitive ion channels.
    • To assess the general applicability of this gating mechanism in biological systems, particularly in hair cells.

    Main Methods:

    • Quantitative analysis of single ion channel records from excised membrane patches.
    • Development and application of a linear four-state model (3 closed, 1 open) to describe channel gating kinetics.
    • Mathematical modeling of tension sensitivity using strain energy principles and analysis of strain sensitivity parameters.
    • Incorporation of the channel model into a system simulating mechanical transduction in hair cells.

    Main Results:

    • Ion channel gating is described by a four-state model where the rate constant k12 is sensitive to tension and membrane potential.
    • Tension sensitivity (theta) suggests the channel concentrates energy from a large membrane area (approx. 500-nm diameter), implying association with the cytoskeleton.
    • Actin filaments appear to be mechanically in parallel with the channel, as indicated by cytochalasin treatment.
    • The model successfully explains kinetic features and sensitivity observed in hair cell mechanotransduction.

    Conclusions:

    • A general gating mechanism for mechanosensitive ion channels, driven by strain energy, is proposed.
    • This mechanism is consistent with observations across various cell types and systems.
    • The findings provide a framework for understanding cellular responses to mechanical stimuli.

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