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A decrease of free radical production near critical targets as a cause of maximum longevity in animals
1Department of Animal Biology-II (Animal Physiology), Faculty of Biology, Complutense University, Madrid, Spain.
Summary
Longer-living species have lower antioxidant levels and reduced free radical production. This suggests a "free radical production hypothesis of aging," where decreased oxygen radical production near DNA extends maximum lifespan.
Area of Science:
- Biogerontology
- Comparative Physiology
- Biochemistry
Background:
- Free radicals are implicated in aging processes.
- Species-specific maximum lifespan varies significantly across vertebrates.
Purpose of the Study:
- To investigate the role of free radicals in determining species-specific maximum lifespan.
- To explore correlations between antioxidant levels, free radical production, and longevity.
Main Methods:
- Comparative analysis of antioxidant enzyme activities and oxidative stress markers in vertebrate brains.
- Measurement of superoxide dismutase, catalase, GSH-peroxidases, GSH-reductase, ascorbic acid, GSH, uric acid, GSSG/GSH ratio, and malondialdehyde.
- Correlation analysis with maximum longevity data.
Main Results:
- Significant inverse correlations found between maximum longevity and brain superoxide dismutase, catalase, GSH-peroxidase, GSH-reductase, and ascorbic acid.
- No correlation observed between maximum lifespan and GSH, uric acid, GSSG/GSH ratio, or malondialdehyde.
- Longevous species exhibit lower antioxidant concentrations and reduced in vivo free radical production.
Conclusions:
- The study proposes the "free radical production hypothesis of aging."
- Decreased oxygen radical production near critical DNA targets (mitochondria, nucleus) may increase maximum lifespan.
- Free radical production is a key factor in aging across species, irrespective of metabolic rules.