SIRT1 Mediates Central Circadian Control in the SCN by a Mechanism that Decays with Aging
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Guarente_SIRT1 mediates.pdf
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Author(s)
Chang, Hung-Chun
Guarente, Leonard Pershing
Date Issued
June 2013
Journal
Cell
Publisher
Elsevier
Citation
Chang, Hung-Chun, and Leonard Guarente. “SIRT1 Mediates Central Circadian Control in the SCN by a Mechanism That Decays with Aging.” Cell 153, no. 7 (June 2013): 1448–1460. © 2013 Elsevier Inc.
Version
Final published version
Abstract
SIRT1 is a NAD[superscript +]-dependent protein deacetylase that governs many physiological pathways, including circadian rhythm in peripheral tissues. Here, we show that SIRT1 in the brain governs central circadian control by activating the transcription of the two major circadian regulators, BMAL1 and CLOCK. This activation comprises an amplifying circadian loop involving SIRT1, PGC-1α, and Nampt. In aged wild-type mice, SIRT1 levels in the suprachiasmatic nucleus are decreased, as are those of BMAL1 and PER2, giving rise to a longer intrinsic period, a more disrupted activity pattern, and an inability to adapt to changes in the light entrainment schedule. Young mice lacking brain SIRT1 phenocopy these aging-dependent circadian changes, whereas mice that overexpress SIRT1 in the brain are protected from the effects of aging. Our findings indicate that SIRT1 activates the central pacemaker to maintain robust circadian control in young animals, and a decay in this activity may play an important role in aging.
MIT Department
Massachusetts Institute of Technology. Department of Biology
Paul F. Glenn Center for Biology of Aging Research (Massachusetts Institute of Technology)
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1016/j.cell.2013.05.027
