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Cell cycle changes in water properties in sea urchin eggs
I L Cameron1, K R Cook, D Edwards
1Department of Structural Biology, University of Texas Health Science Center, San Antonio 78284.
Journal of Cellular Physiology
|October 1, 1987
Summary
Cellular water
Area of Science:
- Cell Biology
- Biophysics
Background:
- The first cell cycle of fertilized sea urchin eggs involves dynamic cellular events.
- Understanding cellular water dynamics is crucial for comprehending cell cycle progression.
Purpose of the Study:
- To investigate changes in cellular water motional properties during the first cell cycle of sea urchin eggs.
- To determine the role of actin polymerization in these water dynamics.
Main Methods:
- Proton NMR T1 relaxation time measurements.
- Ice crystal growth analysis.
- Cytochalasin B treatment to inhibit actin polymerization.
- DNase I assay to quantify monomeric actin (G-actin).
- In vitro actin polymerization studies.
Main Results:
- Proton NMR T1 relaxation time and ice crystal size decreased during mitosis and increased during cleavage.
- These changes were intracellular events, not due to water content variations.
- Cytochalasin B blocked cleavage-associated changes but not the mitotic T1 fall.
- Actin disassembly and reassembly correlated with cell cycle stages.
- In vitro actin polymerization mimicked in vivo changes in T1 time and ice crystal growth.
Conclusions:
- Changes in cellular water motional properties during the first cell cycle are linked to actin polymerization.
- Actin dynamics play a significant role in regulating cytoplasmic water behavior during cell division.