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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Related Experiment Video

Updated: Sep 25, 2025

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Piezoionic mechanoreceptors: Force-induced current generation in hydrogels.

Yuta Dobashi1,2,3, Dickson Yao1, Yael Petel4

  • 1Advanced Materials and Process Engineering Laboratory, University of British Columbia, Vancouver, BC, Canada.

Science (New York, N.Y.)
|April 28, 2022
PubMed
Summary

Researchers developed a new piezoionic skin using hydrogels that convert pressure into ionic currents. This technology mimics the human somatosensory system and could enable advanced bionic sensory interfaces.

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Area of Science:

  • Materials Science
  • Biophysics
  • Neuroscience

Background:

  • The human somatosensory system processes tactile information via ionic currents.
  • Current artificial sensory interfaces often lack the sensitivity and adaptability of biological systems.

Purpose of the Study:

  • To investigate hydrogels capable of transducing pressure into ionic currents, creating a "piezoionic skin."
  • To explore the potential of this piezoionic skin for neuromodulation and bionic sensory interfaces.

Main Methods:

  • Fabrication of hydrogel films with varying cationic and anionic mobility.
  • Patterning hydrogel films with gradients of fixed charge.
  • Characterization of piezoionic current generation and its dependence on material properties.

Main Results:

  • Piezoionic currents were generated in hydrogels, mimicking biological mechanoreceptors with variable durations (milliseconds to hundreds of seconds).
  • These currents demonstrated direct neuromodulation and muscle excitation capabilities.
  • Signal magnitude and duration were tunable by controlling ion mobility and fixed charge gradients.
  • The developed hydrogels achieved charge densities significantly higher than existing triboelectric and piezoelectric devices.

Conclusions:

  • Hydrogel-based piezoionic skin offers a promising route toward self-powered, ultrasoft mechanoreceptors.
  • This technology has potential applications in advanced bionic sensory interfaces and neural stimulation.
  • The findings highlight the importance of ion mobility and charge gradients in designing effective piezoionic materials.