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Switchable adhesive substrates: revealing geometry dependence in collective cell behavior.

Claudio G Rolli1, Hidekazu Nakayama, Kazuo Yamaguchi

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Researchers explored collective cell expansion using photoswitchable surfaces. Cell cluster size and boundary shape influence collective cell migration and leader cell formation during wound healing and metastasis.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Materials Science

Background:

  • Collective cell migration is crucial for biological processes like cancer metastasis and wound healing.
  • Existing in vitro assays have limitations in precisely controlling cell adhesion patterns.
  • Photoswitchable surfaces offer a novel method to dynamically control cell adhesion without mechanical interference.

Purpose of the Study:

  • To investigate collective cell expansion behavior using photoswitchable surfaces with precisely controlled adhesive patterns.
  • To understand how initial cluster size, boundary curvature, and incubation time affect cell sheet expansion and leader cell formation.

Main Methods:

  • Utilized photoswitchable poly(ethylene glycol) (PEG) surfaces conjugated to glass coverslips via 2-nitrobenzyl groups.
  • Generated arbitrary initial cell attaching areas using projection exposure through a photomask and UV light.
  • Induced collective cell expansion by releasing confined epithelial cell sheets via a second UV illumination.
  • Analyzed cell expansion dynamics, leader cell formation, and symmetry breaking in donut-like structures.

Main Results:

  • Cell cluster size and boundary curvature significantly modulate collective cell expansion and leader cell formation.
  • A critical cluster size was identified, beyond which core cells are minimally affected by boundary release.
  • Donut-like structures revealed symmetry breaking between outer convex and inner concave boundary cell behaviors.
  • Initial incubation time was found to modulate collective migration characteristics.

Conclusions:

  • Photoswitchable surfaces provide a powerful tool for studying collective cell migration dynamics with precise spatial and temporal control.
  • Initial geometric constraints and cell density profoundly influence collective cell expansion and the emergence of migratory behaviors.
  • This approach offers new insights into the biophysical mechanisms governing collective cell movement in developmental and disease contexts.