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Updated: Nov 18, 2025

Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
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Modulating the Mechanical Activation of TRPV4 at the Cell-Substrate Interface.

Setareh Sianati1, Lioba Schroeter1, Jessica Richardson1

  • 1EMBL Australia Node in Single Molecule Science and Cellular and Systems Physiology, Faculty of Medicine, School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia.

Frontiers in Bioengineering and Biotechnology
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Summary

The transient receptor potential channel, TRPV4, acts as a context-dependent force sensor. Its mechanical activation is influenced by substrate stiffness and cellular components, differing from other mechanosensitive channels.

Keywords:
TRPV4cell-substrate interfacemechanically activated ion channelmechanicsmechanotransduction

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Area of Science:

  • Cell biology
  • Biophysics
  • Molecular physiology

Background:

  • Mechanically activated ion channels are crucial for force sensing in mammalian cells.
  • The transient receptor potential channel, TRPV4, is a polymodal cation channel activated by mechanical stimuli at the cell-substrate interface.
  • The precise mechanisms of TRPV4 mechanical activation and its regulation remain incompletely understood.

Purpose of the Study:

  • To investigate how substrate mechanics and cytoskeletal elements modulate mechanically evoked TRPV4 currents.
  • To determine how TRPV4 point mutations associated with phosphorylation and arthropathy affect its mechanical activation.
  • To compare the regulatory modulation of TRPV4 with that of the mechanosensitive ion channel PIEZO1.

Main Methods:

  • Electrophysiological recordings of mechanically evoked TRPV4 currents.
  • Manipulation of substrate stiffness and cytoskeletal components.
  • Analysis of TRPV4 point mutations linked to phosphorylation and disease.

Main Results:

  • TRPV4 mechanical activation is significantly influenced by substrate mechanics and cytoskeletal organization.
  • The regulatory modulation of TRPV4 differs distinctly from that of PIEZO1, indicating specialized mechanosensing roles.
  • The impact of specific TRPV4 point mutations on channel activation is stimulus-dependent.

Conclusions:

  • TRPV4's mechanosensitivity is context-dependent, modulated by the cellular microenvironment.
  • TRPV4 and PIEZO1 exhibit distinct regulatory mechanisms, reflecting specialized force-sensing functions.
  • Understanding TRPV4's mechanical gating is critical, as mutations' effects vary with the activation stimulus.