Differential regulation of proteasome functionality in reproductive vs. somatic tissues of Drosophila during aging or oxidative stress.

Détails

ID Serval
serval:BIB_06B172AB54FF
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Differential regulation of proteasome functionality in reproductive vs. somatic tissues of Drosophila during aging or oxidative stress.
Périodique
Faseb Journal
Auteur(s)
Tsakiri E.N., Sykiotis G.P., Papassideri I.S., Gorgoulis V.G., Bohmann D., Trougakos I.P.
ISSN
1530-6860 (Electronic)
ISSN-L
0892-6638
Statut éditorial
Publié
Date de publication
2013
Peer-reviewed
Oui
Volume
27
Numéro
6
Pages
2407-2420
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't Publication Status: ppublish
Résumé
Proteasome is central to proteostasis maintenance, as it degrades both normal and damaged proteins. Herein, we undertook a detailed analysis of proteasome regulation in the in vivo setting of Drosophila melanogaster. We report that a major hallmark of somatic tissues of aging flies is the gradual accumulation of ubiquitinated and carbonylated proteins; these effects correlated with a ~50% reduction of proteasome expression and catalytic activities. In contrast, gonads of aging flies were relatively free of proteome oxidative damage and maintained substantial proteasome expression levels and highly active proteasomes. Moreover, gonads of young flies were found to possess more abundant and more active proteasomes than somatic tissues. Exposure of flies to oxidants induced higher proteasome activities specifically in the gonads, which were, independently of age, more resistant than soma to oxidative challenge and, as analyses in reporter transgenic flies showed, retained functional antioxidant responses. Finally, inducible Nrf2 activation in transgenic flies promoted youthful proteasome expression levels in the aged soma, suggesting that age-dependent Nrf2 dysfunction is causative of decreasing somatic proteasome expression during aging. The higher investment in proteostasis maintenance in the gonads plausibly facilitates proteome stability across generations; it also provides evidence in support of the trade-off theories of aging.
Mots-clé
Aging/genetics, Aging/metabolism, Animals, Animals, Genetically Modified, Antioxidant Response Elements/genetics, Drosophila Proteins/genetics, Drosophila Proteins/metabolism, Drosophila melanogaster/genetics, Drosophila melanogaster/metabolism, Female, Genes, Insect, Intracellular Signaling Peptides and Proteins/genetics, Intracellular Signaling Peptides and Proteins/metabolism, Male, NF-E2-Related Factor 2/genetics, NF-E2-Related Factor 2/metabolism, Ovary/metabolism, Proteasome Endopeptidase Complex/genetics, Proteasome Endopeptidase Complex/metabolism, Testis/metabolism, Tissue Distribution/genetics
Pubmed
Web of science
Création de la notice
20/01/2015 13:39
Dernière modification de la notice
20/08/2019 12:28
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