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Local contractions regulate E-cadherin rigidity sensing.

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Epithelial cells use E-cadherin contractions to actively probe and respond to the mechanical properties of cell-cell adhesions. This process involves specific proteins and helps cells sense neighboring cell tension.

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Area of Science:

  • Cell biology
  • Biophysics
  • Mechanobiology

Background:

  • E-cadherin mediates cell-cell adhesion and is crucial for mechanotransduction in tissues.
  • Epithelial cells actively sense and respond to mechanical cues like rigidity and tension at cell-cell contacts.

Purpose of the Study:

  • To investigate the active processes by which epithelial cells test and respond to the mechanical properties of E-cadherin-mediated adhesive contacts.
  • To elucidate the molecular mechanisms underlying these cellular responses to mechanical stimuli.

Main Methods:

  • Utilized submicrometer, E-cadherin-coated polydimethylsiloxane pillars to quantify cellular forces and responses.
  • Investigated the role of specific proteins including nonmuscle myosin IIB, tropomyosin 2.1, α-catenin, and vinculin in cadherin contractions.
  • Compared cell spreading on soft versus rigid surfaces with and without cadherin contractions.

Main Results:

  • Epithelial cells generate local contractions between E-cadherin adhesions, pulling to a constant distance and duration regardless of pillar rigidity.
  • These cadherin contractions require nonmuscle myosin IIB, tropomyosin 2.1, α-catenin, and vinculin.
  • Cells exhibit differential spreading on soft and rigid surfaces when contractions are active, but not when they are absent.
  • Cadherin contractions facilitate the testing of myosin IIA-mediated tension from neighboring cells, enabling sorting of myosin IIA-depleted cells.

Conclusions:

  • Epithelial cells employ cadherin contractions as an active mechanism to test and respond to the mechanical characteristics of their adhesive contacts.
  • These contractions are essential for sensing the mechanical properties of neighboring cells and contribute to tissue organization and cell sorting.