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Interplay of RhoA and mechanical forces in collective cell migration driven by leader cells
Nature Cell Biology
|February 25, 2014
Summary
Leader cells in migrating epithelial tissues generate significant traction forces. RhoA activity spatially correlates with these forces, suggesting it controls collective cell migration dynamics.
Area of Science:
- Cell biology
- Biophysics
- Developmental biology
Background:
- Collective cell migration is crucial for tissue development and repair.
- Epithelial fronts can form multicellular 'fingers' during migration.
- Leader cells emerge within these fingers, but their mechanical and biochemical drivers are unclear.
Purpose of the Study:
- To dynamically map mechanical forces and biochemical activity in migrating epithelial fingers.
- To elucidate the role of leader cells and RhoA in collective cell migration.
Main Methods:
- Mapping mechanical traction forces exerted by Madin-Darby canine kidney (MDCK) cell migration fingers.
- Analyzing the spatial distribution of RhoA activity at the basal plane.
Main Results:
- Migration fingers function as integrated mechanical units.
- Leader cells within the fingers exert substantial traction forces.
- RhoA activity patterns directly correlate with the mapped traction forces.
Conclusions:
- RhoA signaling is a key regulator of collective cell migration through mechanical force generation.
- Leader cells drive migration by exerting traction, while an acto-myosin cable prevents new leader formation.
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