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Traction forces in locomoting cells

T Oliver1, M Dembo, K Jacobson

  • 1Department of Cell Biology and Anatomy, University of North Carolina at Chapel Hill, Durham 27599-7090, USA.

Cell Motility and the Cytoskeleton
|January 1, 1995
PubMed
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Researchers developed a new method to map cell traction forces. Fish keratocytes exert a perpendicular "pinching" force on their substrate, with minimal forward or rearward forces detected during locomotion.

Area of Science:

  • Cell Biology
  • Biophysics
  • Mechanobiology

Background:

  • Cell locomotion is crucial for biological processes.
  • Understanding the forces cells exert on their environment is key to deciphering cell movement mechanisms.
  • Previous methods for measuring cell traction forces had limitations.

Purpose of the Study:

  • To develop and validate a novel method for quantitatively mapping cell traction forces.
  • To investigate the traction force distribution exerted by locomoting fish keratocytes.
  • To measure the total force required to impede cell locomotion.

Main Methods:

  • Development of an improved non-wrinkling silicone substratum assay for predictable deformation.
  • Utilizing mathematical analysis of rubber deformation to generate traction maps.

Related Experiment Videos

  • Employing a glass microneedle assay to measure the force required to stall cell movement.

    • Main Results:

    • Quantitative traction maps revealed a steady-state "pinching" force exerted by fish keratocytes, perpendicular to their direction of movement.
    • No significant rearward tractions were detected at the cell front.
    • No significant forward tractions associated with adhesion peeling were observed at the cell rear.
    • Approximately 4.5 x 10(-3) dyn of force were needed to stall locomoting keratocytes.

    Conclusions:

    • Fish keratocytes generate a distinct perpendicular traction pattern during locomotion.
    • The findings provide new insights into the mechanics of cell movement and substrate interaction.
    • The developed method offers a robust tool for studying cell-substrate forces in various biological contexts.