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Orientation and polarity in collectively migrating cell structures: statics and dynamics
M Reffay1, L Petitjean, S Coscoy
1Laboratoire Physico-chimie Curie, Paris, France.
Biophysical Journal
|June 7, 2011
Summary
Collective cell migration involves fingers led by a single cell. Cells within these fingers actively migrate, with orientation and tensile stress highest at the tip, highlighting leader cell importance.
Area of Science:
- Cell Biology
- Biophysics
- Developmental Biology
Background:
- Collective cell migration is crucial for development and tissue repair.
- It often features multicellular protrusions (fingers) guided by a leader cell.
Purpose of the Study:
- To investigate cell behavior, orientation, and mechanical forces within migrating epithelial fingers.
- To understand the role of leader cells and cell self-organization in collective migration.
Main Methods:
- Utilized Madin-Darby canine kidney (MDCK) epithelial monolayers.
- Employed laser photoablation and selective laser nanosurgery techniques.
- Analyzed cell orientation, polarization, and tensile stress distribution.
Main Results:
- Cells within fingers exhibit active migration, with orientation and polarity decreasing from tip to base.
- Tensile stress is present in finger cells, increasing towards the tip.
- Leader lamellipodium is essential for finger progression, arising from prior cell self-organization.
Conclusions:
- Collective cell migration involves a dynamic interplay between cell orientation and leader-driven mechanical forces.
- Leader cell emergence is a self-organized phenomenon preceding directed migration.
- Understanding these mechanisms is key to tissue development and wound healing.
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