title: OXIDIZED LIPIDS DID NOT REDUCE LIFESPAN IN THE FRUIT FLY, Drosophila melanogaster.
abstract: Aging is often associated with accumulation of oxidative damage in proteins and lipids. However, some studies do not support this view, raising the question of whether high levels of oxidative damage are associated with lifespan. In the current investigation, Drosophila melanogaster flies were kept on diets with 2 or 10% of either glucose or fructose. The lifespan, fecundity, and feeding as well as amounts of protein carbonyls (PC) and lipid peroxides (LOOH), activities of superoxide dismutase (SOD), catalase, glutathione-S-transferase (GST), and glutathione reductase activity of thioredoxin reductase (TrxR) were measured in "young" (10-day old) and "aged" (50-day old) flies. Flies maintained on diets with 10% carbohydrate lived longer than those on the 2% diets. However, neither lifespan nor fecundity was affected by the type of carbohydrate. The amount of PC was unaffected by diet and age, whereas flies fed on diets with 10% carbohydrate had about fivefold higher amounts of LOOH compared to flies maintained on the 2% carbohydrate diets. Catalase activity was significantly lower in flies fed on diets with 10% carbohydrates compared to flies on 2% carbohydrate diets. The activities of SOD, GST, and TrxR were not affected by the diet or age of the flies. The higher levels of LOOH in flies maintained on 10% carbohydrate did not reduce their lifespan, from which we infer that oxidative damage to only one class of biomolecules, particularly lipids, is not sufficient to influence lifespan.
authors.affiliation: Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine.
authors.forename: Oleh V
authors.initials: OV
authors.lastname: Lushchak
authors.affiliation: Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine.
authors.forename: Dmytro V
authors.initials: DV
authors.lastname: Gospodaryov
authors.affiliation: Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine.
authors.forename: Ihor S
authors.initials: IS
authors.lastname: Yurkevych
authors.affiliation: Institute of Biochemistry and Department of Biology, Carleton University, Ottawa, Canada.
authors.forename: Kenneth B
authors.initials: KB
authors.lastname: Storey
mesh_terms: D000375:Aging; D000818:Animals; D000975:Antioxidants / Q000378:metabolism*; D004044:Dietary Proteins / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000201:enzymology / Q000502:physiology*; D005260:Female; D050356:Lipid Metabolism; D008136:Longevity; D008297:Male; D010084:Oxidation-Reduction
chemical_list: D000975:Antioxidants; D004044:Dietary Proteins
keywords: drosophila; fructose; glucose; lifespan; lipid peroxides