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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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Many-body interactions between contracting living cells.

Roman Golkov1, Yair Shokef2,3,4,5

  • 1Department of Mechanical Engineering, Shamoon College of Engineering, Ashdod, 77245, Israel.

The European Physical Journal. E, Soft Matter
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Summary
This summary is machine-generated.

Cellular mechanics in tissues involve complex interactions. This study reveals that many-body interactions, beyond simple pairwise forces, significantly alter the elastic energy landscape, impacting tissue organization and function.

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Area of Science:

  • Biophysics
  • Cellular Mechanics
  • Tissue Engineering

Background:

  • Inter-cell mechanical interactions are crucial for tissue organization and function.
  • Cells interact within an elastic environment, mediated by mechanical forces.
  • Modeling these interactions requires understanding both linear matrix response and cell-specific nonlinearities.

Purpose of the Study:

  • To investigate the many-body mechanical interactions between multiple cells in an elastic matrix.
  • To analyze how individual cell regulatory behaviors influence emergent inter-cell forces.
  • To determine if pairwise interaction models adequately capture the mechanics of multiple cells.

Main Methods:

  • Modeling cells as spherical active force dipoles in an unbounded linear elastic matrix.
  • Analyzing systems with three or more cells in various geometries.
  • Comparing total elastic energy to the superposition of pairwise interactions.

Main Results:

  • The total elastic energy deviates from pairwise superposition due to cell regulatory behaviors.
  • Cells regulating their position exhibit lower many-body interaction energy than predicted by pairwise sums.
  • Cells not regulating their position show higher many-body interaction energy than pairwise predictions.

Conclusions:

  • Higher-order (many-body) interactions are essential for accurately modeling mechanics in multi-cell systems.
  • Cellular regulatory mechanisms introduce nonlinearities that significantly impact collective mechanical behavior.
  • Future studies of cell mechanics in proximity must account for these emergent many-body effects.