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The role of microtubules in contractile ring function
A H Conrad1, A Q Paulsen, G W Conrad
1Division of Biology, Kansas State University, Manhattan 66506.
The Journal of Experimental Zoology
|May 1, 1992
Summary
Microtubules extending through contractile rings stabilize cell division constrictions. This stabilization is crucial for successful cytokinesis and cell separation in embryos.
Area of Science:
- Cell Biology
- Developmental Biology
- Cytoskeletal Dynamics
Background:
- Cytokinesis involves the formation and constriction of a contractile ring for cell division.
- Ilyanassa obsoleta embryos exhibit two simultaneous contractile rings: the cleavage furrow (CF) and the polar lobe constriction (PLC).
- The CF typically forms a stable neck, while the PLC is transient and relaxes, allowing cytoplasmic merging.
Purpose of the Study:
- To investigate the role of microtubules in the stabilization of contractile rings during cytokinesis.
- To determine if microtubule presence within contractile rings influences their stability and subsequent function.
Main Methods:
- Treatment of Ilyanassa obsoleta embryos with taxol to stabilize microtubules.
- Observation of cleavage furrow (CF) and polar lobe constriction (PLC) formation and stability.
- Immunolocalization of alpha-tubulin and electron microscopy to visualize microtubule presence within contractile rings.
Main Results:
- Taxol treatment prevented CF formation but stabilized PLCs, indicating differential microtubule roles.
- Stabilized CFs and PLCs in taxol-treated embryos showed abundant microtubules and alpha-tubulin.
- Control embryos had microtubules in CFs but not PLCs, correlating with their stability.
Conclusions:
- Microtubule extension through contractile rings is essential for stabilizing the constriction.
- Stabilized microtubules facilitate the completion of cytokinesis and cell separation.