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Cell Rep. 2017 Mar 28;18(13):3052-3062. doi: 10.1016/j.celrep.2017.03.008.

Neuroprotective Functions for the Histone Deacetylase SIRT6.

Author information

1
Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
2
The Massachusetts General Hospital Cancer Center and The MGH Center for Regenerative Medicine, Harvard Medical School, Boston, MA 02114, USA; The Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA.
3
Paul Flechsig Institute for Brain Research, University of Leipzig, Liebigstrasse 19, 04103 Leipzig, Germany.
4
Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel. Electronic address: toiber@bgu.ac.il.

Abstract

The histone deacetylase SIRT6 promotes DNA repair, but its activity declines with age with a concomitant accumulation of DNA damage. Furthermore, SIRT6 knockout mice exhibit an accelerated aging phenotype and die prematurely. Here, we report that brain-specific SIRT6-deficient mice survive but present behavioral defects with major learning impairments by 4 months of age. Moreover, the brains of these mice show increased signs of DNA damage, cell death, and hyperphosphorylated Tau-a critical mark in several neurodegenerative diseases. Mechanistically, SIRT6 regulates Tau protein stability and phosphorylation through increased activation of the kinase GSK3α/β. Finally, SIRT6 mRNA and protein levels are reduced in patients with Alzheimer's disease. Taken together, our results suggest that SIRT6 is critical to maintain genomic stability in the brain and that its loss leads to toxic Tau stability and phosphorylation. Therefore, SIRT6 and its downstream signaling could be targeted in Alzheimer's disease and age-related neurodegeneration.

KEYWORDS:

Alzheimer’s disease; DNA damage; GSK3; SIRT6; Tau; aging

PMID:
28355558
PMCID:
PMC5389893
DOI:
10.1016/j.celrep.2017.03.008
[Indexed for MEDLINE]
Free PMC Article

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