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Related Experiment Video

Updated: Apr 17, 2026

Examining the Dynamics of Cellular Adhesion and Spreading of Epithelial Cells on Fibronectin During Oxidative Stress
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Substrate stress relaxation regulates cell spreading.

Ovijit Chaudhuri1, Luo Gu2, Max Darnell2

  • 11] School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA [2] Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, Massachusetts 02138, USA [3] Department of Mechanical Engineering, Stanford University, Stanford, California 94305, USA.

Nature Communications
|February 20, 2015
PubMed
Summary
This summary is machine-generated.

Cells sense the extracellular matrix (ECM) by gauging resistance to traction forces. This study reveals that viscoelastic ECM stress relaxation enhances cell spreading more than purely elastic substrates, challenging current mechanotransduction models.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • Cellular mechanotransduction traditionally assumes cells sense extracellular matrix (ECM) elasticity via traction forces.
  • Physiological ECMs are viscoelastic and exhibit stress relaxation, unlike the purely elastic materials often used in studies.
  • Cellular traction forces can remodel the ECM, a factor often overlooked in purely elastic models.

Purpose of the Study:

  • To investigate how ECM stress relaxation influences cell behavior.
  • To compare cell spreading on viscoelastic substrates with stress relaxation to that on elastic substrates.

Main Methods:

  • Computational modeling of cell-ECM interactions.
  • In vitro cellular experiments using substrates with varying viscoelastic properties.

Main Results:

  • Cells cultured on soft, stress-relaxing substrates showed greater spreading than on elastic substrates with the same modulus.
  • Cell spreading on stress-relaxing substrates was comparable to spreading on stiffer elastic substrates.
  • Findings challenge the established understanding of cell sensing and response to ECM properties.

Conclusions:

  • ECM viscoelasticity and stress relaxation significantly impact cell behavior.
  • Cellular responses to ECM are more complex than predicted by purely elastic models.
  • This research necessitates a re-evaluation of mechanotransduction mechanisms in physiological contexts.