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Single Cell Durotaxis Assay for Assessing Mechanical Control of Cellular Movement and Related Signaling Events
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Substrates with engineered step changes in rigidity induce traction force polarity and durotaxis.

Mark T Breckenridge1, Ravi A Desai2, Michael T Yang1

  • 1Department of Bioengineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Cellular and Molecular Bioengineering
|October 11, 2016
PubMed
Summary

Cells sense substrate rigidity and migrate towards stiffer areas, a process called durotaxis. This study reveals cells generate stronger traction forces on rigid surfaces, driving directional migration.

Keywords:
Durotaxiscell migrationmechanotransductionmicrofabricationrigidity sensing

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Area of Science:

  • Cellular mechanics
  • Biophysics
  • Tissue engineering

Background:

  • Cellular functions like migration, proliferation, and differentiation depend on rigidity sensing.
  • Durotaxis, or cell migration towards stiffer substrates, is crucial for wound healing and gastrulation.
  • The mechanisms underlying rigidity sensing and durotaxis are not fully understood.

Purpose of the Study:

  • To investigate the role of subcellular traction forces in durotaxis.
  • To explore how cells sense and respond to rigidity gradients.

Main Methods:

  • Developed novel microfabricated elastomeric micropost arrays with juxtaposed regions of different rigidities.
  • Observed NIH 3T3 fibroblast behavior and traction forces on these step-rigidity substrates.

Main Results:

  • Fibroblasts exhibited preferential migration towards the more rigid region, confirming durotaxis.
  • Cells bridging rigidity boundaries generated stronger traction forces on the stiffer side.
  • Traction forces on the rigid side were comparable to cells on uniformly rigid substrates.

Conclusions:

  • Step-rigidity micropost arrays are effective tools for studying traction forces in durotaxis.
  • Cells likely sense local substrate rigidity to create asymmetrical traction forces, driving durotaxis.