Journal
MECHANISMS OF AGEING AND DEVELOPMENT
Volume 127, Issue 4, Pages 356-370Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mad.2005.12.009
Keywords
antioxidants; oxidative stress; lifespan; Drosophila; mitoquinone; superoxide dismutase
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Funding
- Biotechnology and Biological Sciences Research Council [SF19106] Funding Source: Medline
- Medical Research Council [MC_U105663142] Funding Source: Medline
- Wellcome Trust Funding Source: Medline
- Biotechnology and Biological Sciences Research Council [SF19106] Funding Source: researchfish
- Medical Research Council [MC_U105663142] Funding Source: researchfish
- MRC [MC_U105663142] Funding Source: UKRI
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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 (I) 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. (c) 2006 Elsevier Ireland Ltd. All rights reserved.
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