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Network contraction model for cell translocation and retrograde flow
A B Verkhovsky1, T M Svitkina, G G Borisy
1Laboratory of Molecular Biology, University of Wisconsin, Madison 53706, USA.
Biochemical Society Symposium
|May 13, 1999
Summary
Cell motility arises from actin-myosin II networks forming behind the leading edge. This system drives cell movement and internal flow dynamics in fibroblasts and keratocytes.
Area of Science:
- Cell Biology
- Biophysics
Background:
- The actin-myosin II system is crucial for cell shape and movement.
- Understanding its dynamic organization is key to cell motility.
Purpose of the Study:
- To investigate the kinetic and structural basis of the actin-myosin II system in cell motility.
- To elucidate the relationship between actin-myosin network contraction and cell translocation.
Main Methods:
- Kinetic analysis of cellular processes.
- Structural analysis of the actin-myosin II network.
- Observation of mammalian fibroblasts and fish epidermal keratocytes.
Main Results:
- Actin-myosin II machinery forms behind the leading edge as myosin filament clusters within an actin network.
- Contraction of this network relates to actin-myosin bundle formation.
- Network contraction is linked to cell translocation and retrograde flow.
Conclusions:
- The actin-myosin II network's organization and contraction are fundamental to cell motility.
- This system underlies key cellular dynamics including translocation and retrograde flow.