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Cytoskeleton fluidization versus resolidification: Prestress effect

Konstantin I. Morozov1 and Len M. Pismen1,2

  • 1Department of Chemical Engineering, Technion—Israel Institute of Technology, Haifa 32000, Israel
  • 2Minerva Center for Nonlinear Physics of Complex Systems, Technion—Israel Institute of Technology, Haifa 32000, Israel

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Phys. Rev. E 83, 051920 – Published 25 May, 2011

DOI: https://doi.org/10.1103/PhysRevE.83.051920

Abstract

The differential elastic modulus of an active actomyosin network is computed as a function of applied stress, taking into account both thermal and motor contributions to filament compliance in the low-frequency domain. It is shown that, due to a dual nature of motor activity, increasing motor concentration may either stiffen the network due to stronger prestress or soften it due to motor agitation, in accordance with experimental data. Prestress anisotropy, which may be induced by redistribution of motors triggered by external force, causes anisotropy of the elastic moduli. This helps to explain the contradictory phenomena of cell fluidization and resolidification in response to transient stretch observed in recent experiments.

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      Outline

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      Phys. Rev. E 83, 051920– Published 25 May, 2011
      • Received 22 November 2010

      ©2011 American Physical Society

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