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Related Concept Videos

Characteristics of Fluids01:20

Characteristics of Fluids

When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
Characteristics of Fluids01:31

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Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
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Studying the Cytoskeleton

The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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Related Experiment Video

Updated: May 31, 2026

The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
08:50

The Mechanics of (Poro-)Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

Published on: March 10, 2023

Cytoskeleton fluidization versus resolidification: prestress effect.

Konstantin I Morozov1, Len M Pismen

  • 1Department of Chemical Engineering, Technion-Israel Institute of Technology, Haifa, Israel.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 7, 2011
PubMed
Summary
This summary is machine-generated.

This study reveals how motor proteins in actomyosin networks can either stiffen or soften the material based on their concentration and activity. It explains cell fluidization and resolidification phenomena observed under stress.

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Area of Science:

  • Biophysics
  • Cellular Mechanics
  • Soft Matter Physics

Background:

  • Actomyosin networks are crucial for cell mechanics, exhibiting complex responses to stress.
  • Understanding their elastic properties is key to cellular functions like motility and division.
  • Previous models often simplified the contributions of thermal fluctuations and active motor proteins.

Purpose of the Study:

  • To compute the differential elastic modulus of active actomyosin networks.
  • To investigate the impact of motor concentration and applied stress on network stiffness.
  • To explain experimentally observed cell fluidization and resolidification phenomena.

Main Methods:

  • Theoretical computation of elastic modulus in the low-frequency domain.
  • Inclusion of both thermal and motor contributions to filament compliance.
  • Modeling prestress anisotropy induced by motor redistribution under external force.

Main Results:

  • Increasing motor concentration can either stiffen (via prestress) or soften (via agitation) the network.
  • Motor activity exhibits a dual nature affecting network elasticity.
  • Prestress anisotropy leads to anisotropic elastic moduli, explaining contradictory experimental observations.

Conclusions:

  • The model successfully explains the dual stiffening/softening behavior of actomyosin networks.
  • Motor redistribution and resulting prestress anisotropy are critical for understanding cell mechanics under stress.
  • This work provides a framework for interpreting complex cellular responses to mechanical stimuli.