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Single particle tracking of surface receptor movement during cell division
Y L Wang1, J D Silverman, L G Cao
1Worcester Foundation for Experimental Biology, Shrewsbury, Massachusetts 01545.
The Journal of Cell Biology
|November 1, 1994
Summary
Cell division involves coordinated movement of membrane receptors, tracked using fluorescent beads. This movement, linked to actin cortex reorganization, is crucial for cytokinesis and is activated at anaphase onset.
Area of Science:
- Cell Biology
- Cytoskeletal Dynamics
- Molecular Motor Function
Background:
- Cell division, specifically cytokinesis, requires precise coordination of cellular components.
- The role of the actin cortex in directed membrane movement during cell division is not fully understood.
Purpose of the Study:
- To investigate the movement of membrane receptors during cell division.
- To elucidate the relationship between chromosome separation and cortical reorganization.
- To determine the involvement of the actin cortex in cytokinesis.
Main Methods:
- Utilized fluorescent latex beads to label membrane receptors on cultured NRK cells.
- Employed digital imaging techniques to record the movement of individual beads during cell division.
- Applied cytochalasin D treatment to assess the role of actin filaments.
Main Results:
- Bead migration toward the cell equator initiated at anaphase onset, correlating with chromosome separation.
- Bead movement was most active near separating chromosomes and influenced by the spindle interzone.
- Cytochalasin D treatment disrupted organized bead movement, causing aggregation and random motion, highlighting the actin cortex's role.
Conclusions:
- Cytokinesis involves contractile activities across a broad area of the actin cortex, not just the equator.
- Cortical activities are temporally regulated, activated at anaphase onset.
- Spindle interzone and separating chromosomes spatially modulate cortical reorganization during cell division.