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Terminal phase of cytokinesis in D-98s cells
The Journal of Cell Biology
|June 1, 1977
Summary
Cytokinesis completion involves intercellular bridge thinning and constriction, followed by cell separation. Incomplete nuclear division can lead to daughter cell merging after midbody breakdown.
Area of Science:
- Cell Biology
- Molecular Biology
- Microscopy
Background:
- Cytokinesis is the final stage of cell division, ensuring each daughter cell receives a complete set of chromosomes.
- The midbody and intercellular bridge are crucial structures formed during cytokinesis.
- Understanding the precise mechanisms of cytokinesis completion is vital for cell biology research.
Purpose of the Study:
- To investigate the morphological events during cytokinesis completion in D-98S cells.
- To elucidate the roles of the intercellular bridge and midbody in daughter cell separation.
- To observe the process using advanced microscopy techniques.
Main Methods:
- Light and electron microscopy were employed to study D-98S cells.
- Time-lapse films were used to identify and select cells at different cytokinesis stages.
- Serial sectioning of embedded cell monolayers allowed detailed structural analysis.
Main Results:
- Intercellular bridge diameter reduces from 1-1.5 µm to ~0.2 µm before separation.
- Bridge thinning involves midbody structure breakdown and localized constriction.
- Microtubules within the constricted bridge are compacted, and some disappear.
- Cell separation occurs through stretching and breaking of the narrowed bridge.
- Incomplete karyokinesis can lead to daughter cell merging, coinciding with midbody breakdown.
Conclusions:
- Cytokinesis completion is a dynamic process involving significant structural remodeling of the intercellular bridge.
- Localized constriction is a key mechanism driving the reduction of the intercellular bridge diameter.
- Aberrant nuclear division can disrupt cytokinesis, leading to cell fusion.
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