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Lowered methionine ingestion as responsible for the decrease in rodent mitochondrial oxidative stress in protein and
Mónica López-Torres1, Gustavo Barja
1Department of Animal Physiology II, Faculty of Biological Sciences, Complutense University, Madrid 28040, Spain.
Biochimica Et Biophysica Acta
|February 7, 2008
Summary
Reducing dietary methionine, a component of protein, lowers mitochondrial oxidative stress and may extend lifespan. This protein restriction is more practical for humans than overall dietary restriction and could improve healthspan.
Area of Science:
- Biogerontology
- Mitochondrial Biology
- Nutritional Science
Background:
- Long-lived mammals exhibit low mitochondrial reactive oxygen species (ROS) generation and oxidative damage.
- Dietary restriction (DR) in rodents decreases mitochondrial ROS (mtROS) production and associated oxidative damage.
- Protein restriction, but not carbohydrate or lipid restriction, reduces mtROS generation and oxidative stress.
Purpose of the Study:
- To investigate the role of methionine restriction in mitigating mtROS generation and oxidative stress.
- To explore the potential of protein and methionine restriction as practical interventions for increasing longevity and healthspan in humans.
Main Methods:
- Analysis of existing literature on dietary interventions and their effects on mitochondrial function and longevity.
- Comparison of the effects of different dietary restrictions (protein, carbohydrate, lipid, methionine) on mtROS production and oxidative damage in rodent models.
- Evaluation of the impact of dietary methionine levels on mtROS generation and longevity.
Main Results:
- Protein restriction decreases mtROS generation and oxidative stress, increasing rodent longevity.
- Isocaloric methionine restriction reduces mtROS generation and oxidative stress, extending maximum lifespan in rats and mice.
- Excessive dietary methionine increases mtROS generation in rat liver.
Conclusions:
- Reduced dietary methionine intake appears to be a key factor in the mtROS reduction and longevity increase observed with DR.
- Decreasing high protein/methionine intake in Western populations may lower oxidative stress and enhance human healthspan.
- Methionine restriction presents a practical strategy for improving healthspan and longevity, distinct from overall DR.
