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Mouse TRPA1 function and membrane localization are modulated by direct interactions with cholesterol

Justyna B Startek1,2, Brett Boonen1,2, Alejandro López-Requena1,2

  • 1Laboratory of Ion Channel Research and TRP Research Platform Leuven (TRPLe), Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium.

Elife
|June 12, 2019
PubMed

Insights

Cholesterol-rich membrane domains regulate the TRPA1 (transient receptor potential ankyrin 1) channel, a key player in pain and inflammation. Cholesterol interactions are crucial for TRPA1

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • The TRPA1 (transient receptor potential ankyrin 1) channel mediates responses to noxious stimuli, causing pain and neurogenic inflammation.
  • TRPA1's regulation by its membrane environment, particularly cholesterol, is poorly understood.

Purpose of the Study:

  • To investigate TRPA1 localization within membrane microdomains.
  • To determine the role of cholesterol in TRPA1 function and localization.

Main Methods:

  • Total internal reflection fluorescence microscopy.
  • Density gradient centrifugation.
  • Functional channel assays after cholesterol depletion.

Main Results:

  • Mouse TRPA1 preferentially localizes to cholesterol-rich membrane domains.
  • Cholesterol depletion reduces TRPA1 sensitivity to chemical agonists.
  • Specific structural motifs in transmembrane segments 2 and 4 mediate TRPA1-cholesterol interactions, crucial for localization and function.

Conclusions:

  • TRPA1's interaction with cholesterol in membrane microdomains is essential for its normal function and localization.
  • Cholesterol-rich domains play a significant role in regulating TRPA1 gating and sensitivity.
  • Understanding these lipid interactions offers insights into TRPA1 pharmacology and pathophysiology.
Keywords:
CRAC motifTRPA1biochemistrychemical biologychemosensationcholesterollipid raftmouseneurosciencesensory neuron

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