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- Title
Sirtuin-independent effects of nicotinamide on lifespan extension from calorie restriction in yeast.
- Authors
Tsuchiya, Mitsuhiro; Dang, Nick; Kerr, Emily O; Hu, Di; Steffen, Kristan K; Oakes, Jonathan A; Kennedy, Brian K; Kaeberlein, Matt
- Abstract
Two models have been proposed for how calorie restriction (CR) enhances replicative longevity in yeast: (i) suppression of rDNA recombination through activation of the sirtuin protein deacetylase Sir2 or (ii) decreased activity of the nutrient-responsive kinases Sch9 and TOR. We report here that CR increases lifespan independently of all Sir2-family proteins in yeast. Furthermore, we demonstrate that nicotinamide, an inhibitor of Sir2-mediated deacetylation, interferes with lifespan extension from CR, but does so independent of Sir2, Hst1, Hst2, and Hst4. We also find that 5 mm nicotinamide, a concentration sufficient to inhibit other sirtuins, does not phenocopy deletion of HST3. Thus, we propose that lifespan extension by CR is independent of sirtuins and that nicotinamide has sirtuin-independent effects on lifespan extension by CR.
- Publication
Aging cell, 2006, Vol 5, Issue 6, p505
- ISSN
1474-9718
- Publication type
Journal Article
- DOI
10.1111/j.1474-9726.2006.00240.x