Sirt1 mediates neuroprotection from mutant huntingtin by activation of the TORC1 and CREB transcriptional pathway
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Guarente_Sirt1 mediates.pdf
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Author(s)
Jeong, Hyunkyung
Cui, Libin
Supinski, Andrea
Savas, Jeffrey N.
Mazzulli, Joseph R.
Bordone, Laura
Krainc, Dimitri
Cohen, Dena E.
Guarente, Leonard Pershing
Yates, John R., III
Date Issued
December 2011
Journal
Nature Medicine
Publisher
Nature Publishing Group
Citation
Jeong, Hyunkyung, Dena E Cohen, Libin Cui, Andrea Supinski, Jeffrey N Savas, Joseph R Mazzulli, John R Yates, Laura Bordone, Leonard Guarente, and Dimitri Krainc. “Sirt1 mediates neuroprotection from mutant huntingtin by activation of the TORC1 and CREB transcriptional pathway.” Nature Medicine 18, no. 1 (December 18, 2011): 159-165.
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Author's final manuscript
Abstract
Sirt1, a NAD-dependent protein deacetylase, has emerged as a key regulator of mammalian transcription in response to cellular metabolic status and stress. Here we show that Sirt1 has a neuroprotective role in models of Huntington's disease, an inherited neurodegenerative disorder caused by a glutamine repeat expansion in huntingtin protein (HTT). Brain-specific knockout of Sirt1 results in exacerbation of brain pathology in a mouse model of Huntington's disease, whereas overexpression of Sirt1 improves survival, neuropathology and the expression of brain-derived neurotrophic factor (BDNF) in Huntington's disease mice. We show that Sirt1 deacetylase activity directly targets neurons to mediate neuroprotection from mutant HTT. The neuroprotective effect of Sirt1 requires the presence of CREB-regulated transcription coactivator 1 (TORC1), a brain-specific modulator of CREB activity. We show that under normal conditions, Sirt1 deacetylates and activates TORC1 by promoting its dephosphorylation and its interaction with CREB. We identified BDNF as a key target of Sirt1 and TORC1 transcriptional activity in both normal and Huntington's disease neurons. Mutant HTT interferes with the TORC1-CREB interaction to repress BDNF transcription, and Sirt1 rescues this defect in vitro and in vivo. These studies suggest a key role for Sirt1 in transcriptional networks in both the normal and Huntington's disease brain and offer an opportunity for therapeutic development.
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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DOI of Published Version
https://doi.org/10.1038/nm.2559
