Effect of time of restriction on the decrease in mitochondrial H2O2 production and oxidative DNA damage in the heart of food‐restricted rats
Abstract
In the present study, the question if medium-term (4 months) caloric restriction (40%) decreases mitochondrial H2O2 production and oxidative DNA damage was investigated. Caloric restriction (CR) is the only experimental manipulation that increases maximum life span. Previous long-term CR studies have showed that CR decreases the mitochondrial rate of free radical production in diverse tissues and species. Those studies agree with the idea that the superior longevity of the restricted animals can be partly due to their lower mitochondrial rate of free radical generation. However, caloric restriction effects strongly depend on implementation time. Previous studies have shown that the decrease induced by CR on oxygen radical generation and oxidative damage to mitochondrial DNA occurs after 1 year but not after 6 weeks of restriction. In the present investigation, mitochondrial H2O2 production did not change in medium-term (4 months) caloric restricted animals, and, in agreement with that, no differences were found in either mitochondrial or nuclear oxidative DNA damage between restricted and ad libitum-fed animals. These results confirm the importance of the time of CR implementation, and show that time longer than 4 months is needed to decrease the mitochondrial rate of free radical generation and the oxidative damage to mtDNA in the rat heart.
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Caloric restriction decreases ROS production in rodents, particularly at Complex I, thereby preventing oxidative damage in mitochondria from heart, liver, skeletal muscle and brain.
“Originally, it was shown that CR decreases ROS production in rodents, particularly at Complex I, thereby preventing oxidative damage in mitochondria from heart (Gredilla et al., 2002), liver (Lopez-Torres et al., 2002), skeletal muscle (Lass et al., 1998) and brain (Sanz et al., 2005).”
From Role of the mitochondrial DNA replication machinery in mitochondrial DNA mutagenesis, aging and age-related diseases (2017) · cites this paper as Gredilla et al., 2002
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Self-citation
- Authors
- Gredilla, R., López‐Torres, M., & Barja, G.
- Affiliations
- Universidad Complutense de Madrid (ES)
- Corresponding author
- Barja, G.
- Venue
- Microscopy Research and Technique
- Publisher
- Wiley
- Published
- 2002-11-06
- Volume
- 59
- Issue
- 4
- Pages
- 273-277
- ISSN
- 1059-910X (ISSN-L)
- 1097-0029
- OpenAlex
- W1997491649
- Cited by
- 38
- References
- 27
- Citations by year
- 2018: 1 · 2016: 1 · 2015: 2 · 2013: 1
- FWCI
- 1.49
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Microscopy Research and Technique (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Research Foundation of the Spanish Ministry of Health (99/1049)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
- Keywords
- caloric restriction, oxidative DNA damage, mitochondrial DNA damage, heart, free radical generation, longevity, rats
- MeSH terms
- Animals, DNA Damage, Hydrogen Peroxide, Male, Mitochondria, Heart, Oxidation-Reduction, Oxygen Consumption, Time Factors, Rats, Wistar, Caloric Restriction, Rats
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