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Isolation and characterization of deteriosomes from rat liver
1Department of Biology, University of Waterloo, Ontario, Canada.
Journal of Cellular Biochemistry
|April 1, 1993
Summary
Researchers discovered deteriosomes, novel microvesicles in rat liver, which are involved in membrane breakdown and contain phospholipase A2 activity. These findings suggest a new mechanism for cellular membrane deterioration and enzyme localization.
Area of Science:
- Cell Biology
- Biochemistry
Background:
- Deteriosomes are a newly identified class of microvesicles.
- They share similarities with previously studied plant microvesicles, being nonsedimentable and rich in membrane catabolites.
Purpose of the Study:
- To characterize deteriosomes isolated from rat liver tissue.
- To investigate their role in membrane deterioration and enzymatic activity.
Main Methods:
- Isolation of microvesicles from rat liver tissue.
- Analysis of microvesicle size, permeability, and enzymatic content.
Main Results:
- Liver deteriosomes range from 0.05 to 0.11 microns in radius.
- They exhibit increased permeability compared to microsomal vesicles, indicating a perturbed bilayer.
- Deteriosomes contain phospholipase A2 activity, with higher specific activity than in the cytosol.
Conclusions:
- Deteriosomes are formed by microvesiculation from membranes and represent an intermediate stage of membrane deterioration.
- They facilitate the removal of destabilizing catabolites from membranes.
- Phospholipase A2 activity associated with deteriosomes suggests a novel localization for this enzyme, potentially challenging traditional views of cytosolic enzyme distribution.