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Analysis of structural changes during hypotonic swelling in Ehrlich ascites tumor cells
The American Journal of Physiology
|July 1, 1986
Summary
Ehrlich ascites tumor cells rapidly swell and form blebs in hypotonic solutions. These blebs, originating from the plasma membrane, sequester cellular volume increases, allowing for volume-regulatory decrease (VRD).
Area of Science:
- Cell biology
- Biophysics
- Cancer research
Background:
- Cell volume regulation is crucial for cellular function.
- Ehrlich ascites tumor cells are a model for studying cell volume changes.
- Hypotonic stress induces rapid cell swelling and subsequent volume regulatory decrease (VRD).
Purpose of the Study:
- To quantify structural changes during Ehrlich ascites tumor cell swelling in hypotonic medium.
- To investigate the role of bleb formation in cell volume regulation.
- To elucidate the mechanisms underlying volume-regulatory decrease (VRD).
Main Methods:
- Light microscopy, differential interference-contrast (DIC) microscopy.
- Scanning and transmission electron microscopy.
- Computer-assisted morphometry and ATPase antibody localization.
Main Results:
- Cells rapidly swelled in hypotonic medium, forming plasma membrane blebs.
- All gained volume was sequestered within these blebs during initial swelling.
- During VRD, blebs coalesced, reducing the expanded membrane surface.
- Blebs appeared separated from cytoplasm by less dense ground substance.
Conclusions:
- Bleb formation allows cell volume increase without cytoplasmic disorganization.
- Bleb formation may be a protective response to cellular stress.
- VRD involves the reduction of this bleb compartment.