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PIEZO1-Mediated Currents Are Modulated by Substrate Mechanics.

Navid Bavi1,2,3, Jessica Richardson1,3, Celine Heu4

  • 1EMBL Australia Node in Single Molecule Science, School of Medical Sciences , University of New South Wales , Sydney , NSW 2052 , Australia.

ACS Nano
|November 6, 2019
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Summary

Substrate mechanics influence PIEZO1 channel activity. Reduced surface roughness and cellular contractility enhance PIEZO1 sensitivity to mechanical stimuli at the cell-substrate interface.

Keywords:
PIEZO1cytoskeletonmechanically activated ion channelsmembrane tensionsubstrate mechanics

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Area of Science:

  • Biophysics
  • Cell Biology
  • Mechanobiology

Background:

  • PIEZO1 is a critical mechanically activated ion channel involved in various cellular processes.
  • Mechanical cues at the cell-substrate interface are crucial for cell function.
  • Understanding how substrate properties influence PIEZO1 is essential for mechanobiology.

Purpose of the Study:

  • To investigate the role of substrate mechanical properties in modulating PIEZO1 channel activity.
  • To determine how substrate stiffness and roughness affect PIEZO1 response to external stimuli.
  • To elucidate the interplay between cellular contractility and substrate mechanics in PIEZO1 signaling.

Main Methods:

  • Utilized elastomeric pillar arrays as force transducers to apply controlled mechanical stimuli at the cell-substrate interface.
  • Measured PIEZO1 activity in response to substrate deflections under varying pillar spacing and substrate stiffness.
  • Employed computational modeling to analyze membrane tension changes during pillar deflection.

Main Results:

  • PIEZO1 exhibited increased sensitivity to substrate deflections with greater spacing between pillars (reduced roughness).
  • Substrate stiffness did not significantly affect PIEZO1 sensitivity.
  • Cellular contractility was necessary for PIEZO1 sensitization but not for its basal activation.
  • Computational modeling indicated that pillar-induced membrane tension changes were lower than those from cellular indentation.

Conclusions:

  • The mechanical properties of the microenvironment, specifically substrate roughness, can modulate PIEZO1 signaling.
  • Cellular contractility and lipid bilayer forces synergistically regulate PIEZO1 activation at the cell-substrate interface.
  • Directly studying channel activation at the cell-substrate interface is crucial for understanding mechanotransduction.