| The effect of hydrogen peroxide-induced oxidative stress on leukocytes depends on age and physical training in healthy human subjects carrying the same genotypes of antioxidant enzymes' gene polymorphisms. | |
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MedLine Citation:
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PMID: 20878976 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: Reactive oxygen species account for the background levels of oxidatively damaged DNA in normal tissues. Physical exercise increases oxygen consumption and can cause oxidative stress. This stress can also involve deficient antioxidant defenses, which can be influenced by certain genetic polymorphisms. Because regular exercise is a known inducer of antioxidant enzymes, the objective of this study was to compare, by comet assay, differences in the DNA damage between apparently healthy individuals and trained aerobic sportsmen carrying the same single nucleotide polymorphisms of manganese superoxide dismutase (Val9Ala), catalase (-21A/T), glutathione peroxidase 1 (Pro198Leu), before and after exposing leukocytes from peripheral blood to hydrogen peroxide (H₂O₂). METHODS: Athletes were compared with nonathletes after a situation that promotes reactive oxygen species increase (a race). Blood samples were submitted to genotyping and comet assay, and the athletes and nonathletes were paired according to their gender, age, and MnSOD, CAT, and GPx-1 genotypes. RESULTS: For nonathletes, there was a positive correlation between H₂O₂ concentrations and DNA damage levels. For athletes, these correlations showed differences between sexes, indicating that running may impose higher oxidative stress on the DNA of women than of men. Significant differences appeared for nonathletes in the comparisons between younger and older age groups after treatment with H₂O₂ at 250 μM. CONCLUSIONS: This suggests that, for individuals carrying the same genotypes of antioxidant enzymes' genes, the effect of H₂O₂-induced oxidative stress depends mainly on age and physical training. It also suggests that aerobic physical training can reduce oxidative damages to DNA, preventing related diseases in older people. |
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Authors:
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Ana Luisa Miranda-Vilela; Penha Cristina Z Alves; Arthur K Akimoto; Luiz Carlos S Pereira; Maria de Nazaré Klautau-Guimarães; Cesar K Grisolia |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: American journal of human biology : the official journal of the Human Biology Council Volume: 22 ISSN: 1520-6300 ISO Abbreviation: Am. J. Hum. Biol. Publication Date: 2010 Nov-Dec |
Date Detail:
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Created Date: 2010-10-19 Completed Date: 2011-02-03 Revised Date: 2011-03-16 |
Medline Journal Info:
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Nlm Unique ID: 8915029 Medline TA: Am J Hum Biol Country: United States |
Other Details:
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Languages: eng Pagination: 807-12 Citation Subset: IM |
Copyright Information:
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© 2010 Wiley-Liss, Inc. |
Affiliation:
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Departamento de Genética e Morfologia, Laboratório de Genética, Instituto de Ciências Biológicas, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasília/DF, Brazil. mirandavilela@unb.br |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Age Factors Athletes Catalase / genetics DNA Damage Exercise / physiology* Female Genotype Glutathione Peroxidase / genetics Humans Hydrogen Peroxide / pharmacology* Leukocytes / drug effects, metabolism* Male Middle Aged Oxidative Stress* Physical Fitness / physiology* Polymorphism, Single Nucleotide Sex Factors Superoxide Dismutase / genetics |
| Chemical | |
Reg. No./Substance:
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7722-84-1/Hydrogen Peroxide; EC 1.11.1.-/glutathione peroxidase GPX1; EC 1.11.1.6/Catalase; EC 1.11.1.9/Glutathione Peroxidase; EC 1.15.1.1/Superoxide Dismutase |
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