The effects of exogenous antioxidants on lifespan and oxidative stress resistance in Drosophila melanogaster.

TitleThe effects of exogenous antioxidants on lifespan and oxidative stress resistance in Drosophila melanogaster.
Publication TypeJournal Article
Year of Publication2006
AuthorsMagwere, T, West, M, Riyahi, K, Murphy, MP, Smith, RAJ, Partridge, L
JournalMech Ageing Dev
Volume127
Issue4
Pagination356-70
Date Published2006 Apr
ISSN0047-6374
KeywordsAging, Animals, Animals, Genetically Modified, Antioxidants, Dose-Response Relationship, Drug, Drosophila melanogaster, Female, Free Radicals, Genes, Insect, Homozygote, Longevity, Male, Models, Statistical, Onium Compounds, Organophosphorus Compounds, Oxidative Stress, Paraquat, RNA Interference, Sex Factors, Superoxide Dismutase, Temperature, Time Factors, Trityl Compounds, Ubiquinone
Abstract

We used the fruit fly Drosophila melanogaster to test the effects of feeding the superoxide dismutase (SOD) mimetic drugs Euk-8 and -134 and the mitochondria-targeted mitoquinone (MitoQ) on lifespan and oxidative stress resistance of wild type and SOD-deficient flies. Our results reaffirm the findings by other workers that exogenous antioxidant can rescue pathology associated with compromised defences to oxidative stress, but fail to extend the lifespan of normal, wild type animals. All three drugs showed a dose-dependent increase in toxicity in wild type flies, an effect that was exacerbated in the presence of the redox-cycling drug paraquat. However, important findings from this study were that in SOD-deficient flies, where the antioxidant drugs increased lifespan, the effects were sex-specific and, for either sex, the effects were also variable depending on (1) the stage of development from which the drugs were given, and (2) the magnitude of the dose. These findings place significant constraints on the role of oxidative stress in normal ageing.

DOI10.1016/j.mad.2005.12.009
Alternate JournalMech. Ageing Dev.
Citation Key10.1016/j.mad.2005.12.009
PubMed ID16442589
Grant ListMC_U105663142 / / Medical Research Council / United Kingdom
SF19106 / / Biotechnology and Biological Sciences Research Council / United Kingdom
/ / Wellcome Trust / United Kingdom