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Leading edge movement and ultrastructure in mouse macrophages
G Rinnerthaler1, M Herzog, M Klappacher
1Institute for Molecular Biology, Austrian Academy of Sciences, Salzburg.
Journal of Structural Biology
|February 1, 1991
Summary
Cell protrusion involves actin cytoskeleton reorganization. Rapid forward movement correlates with a dense actin filament network, while slower movement shows a looser structure, impacting cell translocation.
Area of Science:
- Cell Biology
- Cytoskeletal Dynamics
- Biophysics
Background:
- Cell translocation is crucial for biological processes.
- Cell movement initiates with leading-edge protrusion.
- Understanding the actin cytoskeleton's role is key.
Purpose of the Study:
- To investigate the ultrastructural changes in the actin cytoskeleton during cell protrusion.
- To correlate actin network formation with the dynamics of cell locomotion.
Main Methods:
- Video microscopy to record cell locomotion history.
- Electron microscopy to examine the actin cytoskeleton ultrastructure.
- Correlation analysis between actin meshwork width and translocation speed.
Main Results:
- Rapid cell protrusion is linked to a dense, diagonal actin filament network without organized bundles.
- Slower cell edge fluctuations correlate with a loose peripheral actin filament bundle.
- Leading-edge meshwork width shows an approximate correlation with net forward translocation.
Conclusions:
- Actin cytoskeleton organization directly influences cell protrusion dynamics.
- The structure of the actin network in the leading edge is a determinant of translocation speed.
- Findings provide insights into the mechanisms of cell movement.