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Effect of vitamin A on longevity
H R Massie1, V R Aiello, T R Williams
1Masonic Medical Research Laboratory Utica, New York 13501.
Experimental Gerontology
|November 1, 1993
Summary
Adequate Vitamin A intake during development significantly extends Drosophila lifespan, with optimal levels between 4-8 IU/g. High concentrations, however, can shorten life by affecting lipid peroxidation via superoxide radical reactions.
Area of Science:
- Biochemistry
- Gerontology
- Nutritional Science
Background:
- Dietary Vitamin A is crucial for development and health.
- Oxidative stress and lipid peroxidation are implicated in aging processes.
- The role of Vitamin A in modulating these processes is not fully understood.
Purpose of the Study:
- To investigate the impact of dietary Vitamin A on Drosophila lifespan.
- To determine the optimal concentration range of Vitamin A for life extension.
- To elucidate the biochemical mechanisms underlying Vitamin A's effects on lipid peroxidation.
Main Methods:
- Feeding Drosophila with varying concentrations of Vitamin A during developmental stages.
- Measuring median and maximum lifespan.
- Assessing the effect of different Vitamin A forms on superoxide radical-induced lipid peroxidation of linolenic acid in vitro.
- Evaluating retinoid interaction with superoxide radicals using cytochrome c reduction assays.
Main Results:
- Increasing Vitamin A from inadequate to adequate levels extended median Drosophila lifespan by up to 17.5%.
- The optimal dietary range for Vitamin A to increase lifespan was 4-8 IU/g food; higher concentrations reduced maximum lifespan.
- Vitamin A palmitate and retinal inhibited lipid peroxidation, while retinol and retinoic acid showed biphasic effects (inhibition at low, stimulation at high concentrations).
- Retinoids reacted with superoxide radicals, suggesting a concentration-dependent mechanism for modulating lipid peroxidation.
Conclusions:
- Dietary Vitamin A concentration critically influences Drosophila lifespan.
- Optimal Vitamin A intake promotes longevity, whereas excessive intake can be detrimental.
- The concentration-dependent modulation of lipid peroxidation by retinoids through interaction with superoxide radicals likely underlies these lifespan effects.