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Stability of adhesion clusters under constant force.

T Erdmann1, U S Schwarz

  • 1Max Planck Institute of Colloids and Interfaces, D-14424 Potsdam, Germany.

Physical Review Letters
|April 20, 2004
PubMed
Summary

Rebinding is crucial for the physiological lifetimes of molecular bonds under load. Stronger rebinding dramatically increases bond cluster lifetime, while increased loading can accelerate bond decay and trigger cell signaling.

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Area of Science:

  • Biophysics
  • Molecular Mechanics
  • Cell Biology

Background:

  • Molecular bonds are essential for cellular functions.
  • Understanding bond dynamics under load is critical for cell adhesion and signaling.
  • Stochastic processes govern the behavior of molecular bonds.

Purpose of the Study:

  • To investigate the lifetime of parallel bond clusters under constant loading and rebinding.
  • To determine the influence of force and rebinding on bond cluster stability.
  • To explore the potential role of bond decay in cell-matrix adhesion signaling.

Main Methods:

  • Solving stochastic equations for bond cluster dynamics.
  • Modeling constant loading, rebinding, and dissociation.
  • Analyzing bond lifetime and decay rates in different force regimes.

Main Results:

  • Cluster lifetime shows logarithmic growth with bond number for weak rebinding, but exponential growth for strong rebinding.
  • Rebinding is essential for achieving biologically relevant bond lifetimes.
  • In the intermediate force regime, a slight increase in loading significantly accelerates bond decay.
  • Bond decay dynamics may mediate signaling events in cell-matrix adhesions.

Conclusions:

  • Rebinding is a critical factor in maintaining the stability of molecular bonds.
  • The force-dependent decay of bond clusters can act as a signaling mechanism for cells.
  • This study provides insights into the mechanics of cell adhesion and mechanotransduction.

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