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Cell adhesion as wetting transition?

Erich Sackmann1, Robijn F Bruinsma

  • 1Physik Department E22, Technische Universität München, 85748 Garching, Germany. erich.sackmann@physik.tu-muenchen.de

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|December 31, 2002
PubMed
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Cell adhesion involves receptor interactions, nonspecific forces, and membrane elasticity. Simplified models reveal adhesion as a dewetting transition, stabilized by glycocalyx and stress fibers.

Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Cell adhesion is a complex process governed by various forces including receptor-ligand interactions, nonspecific forces, and membrane mechanics.
  • Understanding the physical principles underlying cell adhesion is crucial for fields ranging from developmental biology to tissue engineering.

Purpose of the Study:

  • To investigate the physical basis of cell adhesion using simplified model systems.
  • To explore the mechanisms controlling adhesion transitions and the role of specific cellular components.

Main Methods:

  • Design of simplified model systems mimicking cell and tissue surfaces.
  • Utilizing microinterferometry for local measurements of cellular shape changes and adhesion forces.

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Main Results:

  • Cell adhesion is characterized as a first-order dewetting transition, leading to the formation of adhesion plaques like focal adhesions.
  • Adhesion can occur at remarkably low receptor densities, with glycocalyx repeller molecules modulating binding forces and mechanical stability.
  • Stress fibers are proposed to stabilize adhesion domains against hydrodynamic shear forces.

Conclusions:

  • Cell adhesion is a multifaceted physical phenomenon influenced by both specific and nonspecific interactions, as well as membrane properties.
  • The study provides a physical framework for understanding adhesion plaque formation and stabilization mechanisms.
  • The findings highlight the critical roles of the glycocalyx and stress fibers in regulating cell adhesion dynamics and stability.