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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
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Cellular Contraction Can Drive Rapid Epithelial Flows.

Dhruv K Vig1, Alex E Hamby1, Charles W Wolgemuth2

  • 1Department of Molecular and Cellular Biology, University of Arizona, Tucson, Arizona.

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|October 6, 2017
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Summary
This summary is machine-generated.

Individual cell biophysics, not just leader cells or jamming, drives collective epithelial cell migration. Altering cell contraction and adhesion significantly impacts motility, challenging traditional wound-healing assays.

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Area of Science:

  • Cell biology
  • Biophysics
  • Cancer research

Background:

  • Collective cell migration is crucial for development and disease.
  • Leader cells and jamming are proposed mechanisms for collective cell movement.
  • The role of individual cell biophysics in collective dynamics is not fully understood.

Purpose of the Study:

  • To investigate how individual cell biophysical properties influence collective epithelial cell migration.
  • To determine the relative importance of intracellular contractile stress, isolated cell speed, and adhesion in collective dynamics.
  • To assess the validity of wound-healing assays for measuring cell migration.

Main Methods:

  • Experimental manipulation of epithelial cell layers.
  • Mathematical modeling of collective cell migration.
  • Analysis of intracellular contractile stress, isolated cell speed, and adhesion.

Main Results:

  • Collective epithelial dynamics are significantly influenced by intracellular contractile stress, isolated cell speed, and adhesion.
  • Alterations in contraction and/or substrate adhesion can increase epithelial monolayer motility.
  • Wound closure rates do not universally correlate with isolated cell speed or leader cell presence.
  • Collective dynamics do not consistently follow jamming models.

Conclusions:

  • Individual cell biophysics are fundamental drivers of collective cell migration.
  • Intracellular contraction and substrate adhesion are key regulators of epithelial dynamics.
  • Cancer metastasis-like motility can be induced by modifying cell contraction and adhesion.
  • Wound-healing assays may not be a universally reliable method for assessing cell migration capacity.