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Plasma membrane mechanical stress activates TRPC5 channels.

Bing Shen1, Ching-On Wong2, On-Chai Lau2

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Cellular mechanical stress activates the TRPC5 ion channel at the single-channel level. Actin cytoskeleton is crucial for TRPC5 mechanosensitivity, mediating responses to hypoosmotic stress and membrane pressure.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Ion Channel Physiology

Background:

  • Cells sense mechanical stress via the plasma membrane, initiating mechanoelectric transduction.
  • Mechanosensitive ion channels are key for converting mechanical signals into electrical ones.
  • Transient Receptor Potential (TRP) channels are involved in mechanotransduction.

Purpose of the Study:

  • To investigate the response of the TRPC5 channel to mechanical stress.
  • To elucidate the mechanisms of TRPC5 activation by mechanical forces.
  • To determine the role of the actin cytoskeleton in TRPC5 mechanosensitivity.

Main Methods:

  • Single-channel patch-clamp recordings of TRPC5.
  • Application of hypoosmotic stress.
  • Application of negative pressure to membrane patches.
  • Disruption of actin filaments using pharmacological agents.

Main Results:

  • TRPC5 exhibits stretch-activated currents at the single-channel level.
  • Activation thresholds were determined for hypoosmotic stress (240 mOsm) and membrane pressure (-20 to -40 mmHg).
  • Disruption of actin filaments abolished TRPC5 responses to mechanical stimuli but not stretch-independent activation.

Conclusions:

  • TRPC5 is a mechanosensitive ion channel activated by cellular mechanical stress.
  • The actin cytoskeleton is essential for TRPC5 mechanotransduction.
  • TRPC5 activation occurs at the single-channel level upon reaching specific mechanical stress thresholds.