SirT1 Regulates Energy Metabolism and Response to Caloric Restriction in Mice
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The yeast sir2 gene and its orthologues in Drosophila and C. elegans have well-established roles in lifespan determination and response to caloric restriction. We have studied mice carrying two null alleles for SirT1, the mammalian orthologue of sir2, and found that these animals inefficiently utilize ingested food. These mice are hypermetabolic, contain inefficient liver mitochondria, and have elevated rates of lipid oxidation. When challenged with a 40% reduction in caloric intake, normal mice maintained their metabolic rate and increased their physical activity while the metabolic rate of SirT1-null mice dropped and their activity did not increase. Moreover, CR did not extend lifespan of SirT1-null mice. Thus, SirT1 is an important regulator of energy metabolism and, like its orthologues from simpler eukaryotes, the SirT1 protein appears to be required for a normal response to caloric restriction.
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Sirtuins, the Sir2 homologues, mediate certain effects of caloric restriction in flies and mammals.
“Homologues of Sir2 (called sirtuins) have subsequently been shown to mediate some of the effects of caloric restriction in flies (82) and mammals (83,84).”
From Neural mechanisms of ageing and cognitive decline (2010) · cites this paper as [83]
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“In fact, in Sirt1 / mice the beneficial effects on metabolism and longevity induced by a CR diet are attenuated, although it should be noted that these mice are very sick to start with (Boily et al., 2008; Chen et al., 2005).”
BackgroundMammalian Sirtuins and Energy Metabolism
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- Authors
- Boily, G., Seifert, E. L., Bevilacqua, L., He, X. H., Sabourin, G., Estey, C., Moffat, C., Crawford, S., Saliba, S., Jardine, K., Xuan, J., Evans, M., Harper, M.-E., & McBurney, M. W.
- Affiliations
- University of Ottawa (CA)
- Corresponding author
- McBurney, Michael W.
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2008-03-12
- Volume
- 3
- Issue
- 3
- Pages
- e1759
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC2258149
- OpenAlex
- W2035543709
- Cited by
- 444
- References
- 40
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 7 · 2023: 8 · 2022: 12 · 2021: 16 · 2020: 17 · 2019: 22 · 2018: 20 · 2017: 23 · 2016: 27 · 2015: 25 · 2014: 34 · 2013: 41 · 2012: 29
- FWCI
- 20.45
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Canadian Diabetes Association
- University of Guelph
- Canadian Institutes of Health Research
- Topics
- Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Keywords
- SIRT1, sirtuins, caloric restriction, energy metabolism, hypermetabolism, mitochondrial efficiency, liver mitochondria, lipid oxidation, metabolic rate, physical activity, lifespan
- MeSH terms
- Animals, Energy Intake, Calorimetry, Energy Metabolism, Hormones, Mitochondria, Liver, Reactive Oxygen Species, Mice, Knockout, Sirtuins, Mice, Sirtuin 1
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