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Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
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Sensing of lysophospholipids by TRPC5 calcium channel

Philippa K Flemming1, Alexandra M Dedman, Shang-Zhong Xu

  • 1Institute of Membrane and Systems Biology, University of Leeds, Leeds LS2 9JT, United Kingdom.

The Journal of Biological Chemistry
|December 22, 2005
PubMed

Insights

Transient Receptor Potential Canonical (TRPC) calcium channels, specifically TRPC5, are activated by lysophosphatidylcholine (LPC). This activation occurs independently of G-protein signaling, revealing a novel lipid-sensing function.

Area of Science:

  • Molecular biology
  • Cell physiology
  • Ion channel function

Background:

  • Transient Receptor Potential Canonical (TRPC) calcium channels are vital in vertebrate cells.
  • Mechanisms of TRPC channel activation and their regulators are not fully understood.

Purpose of the Study:

  • To investigate the endogenous regulators and activation mechanisms of TRPC5 calcium channels.
  • To identify specific lysophospholipids that modulate TRPC5 channel activity.

Main Methods:

  • Utilized excised membrane patch-clamp electrophysiology.
  • Investigated TRPC5 channel activation by various lysophospholipids and arachidonic acid.
  • Examined the role of G-protein signaling and reactive oxygen species in TRPC5 activation.

Main Results:

  • TRPC5 channels are potently activated by lysophosphatidylcholine (LPC), but not arachidonic acid.
  • LPC-induced TRPC5 activation is downstream and independent of G-protein-coupled receptor signaling.
  • Activation occurs directly on excised membrane patches, suggesting interaction with the channel protein or lipid bilayer.

Conclusions:

  • TRPC5 possesses a previously unrecognized lysophospholipid-sensing capability.
  • TRPC5 functions as a lipid-gated ionotropic receptor, responding directly to specific lipid molecules.
  • Lysophospholipid modulation offers a new avenue for understanding TRPC channel physiology.

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