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Species differences in membrane susceptibility to lipid peroxidation
Y Singh1, G L Hall, M G Miller
1Department of Environmental Toxicology, UC Davis 95616.
Journal of Biochemical Toxicology
|January 1, 1992
Summary
Species differences in liver microsomes
Area of Science:
- Biochemistry
- Comparative Physiology
- Toxicology
Background:
- Lipid peroxidation is a key process in cellular damage.
- Microsomes are critical cellular components involved in metabolism.
- Species-specific differences in microsomal susceptibility to lipid peroxidation are not fully understood.
Purpose of the Study:
- To investigate and compare the susceptibility of liver microsomes to lipid peroxidation across seven different species.
- To determine the influence of membrane fatty acid composition and vitamin E levels on this susceptibility.
Main Methods:
- Lipid peroxidation was quantified using thiobarbituric acid reactive substances (TBARS) assay.
- Initiating systems included FeCl3-ADP/ascorbate and FeCl2/H2O2.
- Microsomal fatty acid profiles and vitamin E content were analyzed.
Main Results:
- Rat, rabbit, and trout microsomes showed varying susceptibility: rat > rabbit >> trout.
- Trout microsomes exhibited high resistance to peroxidation, attributed to elevated vitamin E levels.
- Susceptibility correlated with fatty acid unsaturation (docosahexaenoic > arachidonic > linoleic).
- Vitamin E levels, except in trout, did not significantly affect peroxidation below a certain threshold.
Conclusions:
- Species differences in microsomal lipid peroxidation susceptibility are primarily influenced by the content of peroxidizable fatty acids.
- Vitamin E acts as a critical threshold protector against lipid peroxidation.
- Predicting peroxidation susceptibility based on fatty acid profiles is feasible when vitamin E levels are adequate.