TRPM4 Is a Novel Component of the Adhesome Required for Focal Adhesion Disassembly, Migration and Contractility

PLoS One. 2015 Jun 25;10(6):e0130540. doi: 10.1371/journal.pone.0130540. eCollection 2015.

Abstract

Cellular migration and contractility are fundamental processes that are regulated by a variety of concerted mechanisms such as cytoskeleton rearrangements, focal adhesion turnover, and Ca2+ oscillations. TRPM4 is a Ca2+-activated non-selective cationic channel (Ca2+-NSCC) that conducts monovalent but not divalent cations. Here, we used a mass spectrometry-based proteomics approach to identify putative TRPM4-associated proteins. Interestingly, the largest group of these proteins has actin cytoskeleton-related functions, and among these nine are specifically annotated as focal adhesion-related proteins. Consistent with these results, we found that TRPM4 localizes to focal adhesions in cells from different cellular lineages. We show that suppression of TRPM4 in MEFs impacts turnover of focal adhesions, serum-induced Ca2+ influx, focal adhesion kinase (FAK) and Rac activities, and results in reduced cellular spreading, migration and contractile behavior. Finally, we demonstrate that the inhibition of TRPM4 activity alters cellular contractility in vivo, affecting cutaneous wound healing. Together, these findings provide the first evidence, to our knowledge, for a TRP channel specifically localized to focal adhesions, where it performs a central role in modulating cellular migration and contractility.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Actins / metabolism*
  • Calcium / metabolism
  • Cell Lineage
  • Cell Movement / genetics
  • Cytoskeleton / genetics
  • Cytoskeleton / metabolism
  • Focal Adhesion Protein-Tyrosine Kinases / genetics
  • Focal Adhesion Protein-Tyrosine Kinases / metabolism
  • Focal Adhesions / genetics
  • Focal Adhesions / metabolism*
  • Humans
  • Muscle Contraction / genetics*
  • Phosphorylation
  • Proteomics*
  • TRPM Cation Channels / genetics
  • TRPM Cation Channels / metabolism*

Substances

  • Actins
  • TRPM Cation Channels
  • TRPM4 protein, human
  • Focal Adhesion Protein-Tyrosine Kinases
  • Calcium