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Age-related differences in synaptosomal peroxidative damage and membrane properties.
P Viani1, G Cervato, A Fiorilli
1Department of Medical Chemistry and Biochemistry, Faculty of Medicine, University of Milan, Italy.
Journal of Neurochemistry
|January 1, 1991
Summary
Aging impairs brain synaptosome function by altering lipid composition and reducing membrane fluidity. Oxidative damage significantly contributes to these age-related changes, especially in older rats.
Area of Science:
- Neuroscience
- Biochemistry
- Gerontology
Background:
- Brain synaptosomes are crucial for neuronal function.
- Aging affects cellular structures and biochemical processes.
- Lipid peroxidation is implicated in age-related cellular damage.
Purpose of the Study:
- To investigate the impact of aging on rat brain synaptosome integrity and function.
- To analyze age-related changes in lipid composition, membrane fluidity, and enzyme activity.
- To assess the role of lipid peroxidation in age-associated synaptosome alterations.
Main Methods:
- Comparative analysis of synaptosomes from young, adult, and old rats.
- Evaluation of lipid composition, including free fatty acids and phospholipids.
- Measurement of membrane fluidity, Na+, K(+)-ATPase activity, and susceptibility to lipid peroxidation.
Main Results:
- Aging increased synaptosomal free fatty acids and the cholesterol/phospholipid ratio.
- Decreased membrane fluidity and Na+, K(+)-ATPase activity were observed with age.
- Old rat synaptosomes showed increased susceptibility to lipid peroxidation, leading to greater membrane alteration.
Conclusions:
- Age-related alterations in lipid composition and reduced membrane fluidity impair synaptosome function.
- Oxidative damage, indicated by lipid peroxidation, significantly contributes to brain aging.
- Pathological conditions promoting oxidative injury may have more severe consequences in aged brains.