Dietary restriction in Drosophila

被引:278
作者
Partridge, L [1 ]
Piper, MDW [1 ]
Mair, W [1 ]
机构
[1] UCL, Ctr Res Ageing, Dept Biol, London WC1E 6BT, England
基金
英国生物技术与生命科学研究理事会; 英国惠康基金;
关键词
dietary restriction; Drosophila; demographic analysis;
D O I
10.1016/j.mad.2005.03.023
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The fruit fly Drosophila is a useful organism for the investigation of the mechanisms by which dietary restriction (DR) extends lifespan. Its relatively short generation time, well-characterised molecular biology, genetics and physiology and ease of handling for demographic analysis are all major strengths. Lifespan has been extended by DR applied to adult Drosophila, by restriction of the availability of live yeast or by coordinate dilution of the whole food medium. Lifespan increases to a maximum through DR with a progressive dilution of the food and then decreases through starvation as the food is diluted further. Daily and lifetime fecundities of females are reduced by food dilution throughout the DR and starvation range. Standard Drosophila food ingredients differ greatly between laboratories and fly stocks can differ in their responses to food dilution, and a full range of food concentrations should therefore be investigated when examining the response to DR. Flies do not alter the time that they spend feeding in response to DR. Both mean and maximum lifespan are extended by DR. The nutrients critical for the response to DR in Drosophila require definition. The extension of lifespan in response to DR is very much greater in females than in males. Two nutrient-sensing pathways, the insulin/IGF-like and TOR pathways, have been implicated in mediating this response of lifespan to DR in Drosophila, as have two protein deacetylases, dSir2 and Rpd3, although the precise nature of this interaction remain to be characterised. Although female fecundity is reduced by DR, the response of lifespan to DR appears normal in sterile females, possibly implying that reduced fecundity is not necessary for extension of lifespan by DR. There is no reduction in metabolic rate or in the rate of generation of superoxide and hydrogen peroxide from isolated mitochondria in response to DR. DR acts acutely and rapidly (within 48 h) to reduce the mortality of flies that are fully fed to the level found in animals exposed to DR throughout life. This rapid mortality rate recovery provides a powerful framework within which to further investigate the mechanisms by which DR extends lifespan. (c) 2005 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:938 / 950
页数:13
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