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Cellular rigidity sensing is crucial for cell fate. This study reveals two molecular modules in focal adhesions that sense substrate stiffness, one involving vinculin

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Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Cellular rigidity sensing influences cell fate and behavior, but molecular mechanisms remain unclear.
  • Focal adhesions (FAs) are key cellular structures that mediate cell-matrix interactions and are implicated in force transmission.
  • Vinculin, a component of FAs, exhibits force-dependent auto-inhibition, but its role in rigidity sensing is unknown.

Purpose of the Study:

  • To investigate the molecular mechanisms by which cells sense substrate rigidity.
  • To determine the role of vinculin's auto-inhibitory mechanism in rigidity sensing.
  • To identify distinct molecular modules within focal adhesions responsible for rigidity sensing.

Main Methods:

  • Quantitative fluorescence microscopy on live human Mesenchymal Stem Cells (hMSCs).
  • Analysis of protein recruitment and interaction dynamics within focal adhesions under varying substrate rigidities.
  • Investigating the role of vinculin head-tail interaction in cellular responses.

Main Results:

  • Two distinct rigidity-sensing molecular modules were identified in FAs.
  • One module, involving vinculin and talin, is regulated by vinculin's head-tail interaction and affects cell morphology.
  • Vinculin and talin are recruited independently to FAs in a rigidity-dependent manner, interacting at a site proximal to the talin head.

Conclusions:

  • Vinculin's head-tail interaction is essential for destabilizing vinculin and talin on soft substrates, promoting hMSC branching.
  • A second module involving paxillin and FAK also destabilizes on soft substrates, but independently of vinculin's head-tail interaction.
  • This multi-modular system allows cells to respond flexibly to diverse biomechanical cues.