Abnormal activation of insulin-like growth factor (IGF)-Akt signaling is implicated in the development of various diseases, including heart failure. However, the molecular mechanisms that regulate activation of this signaling pathway are not completely understood. Here we show that sirtuin 6 (SIRT6), a nuclear histone deacetylase, functions at the level of chromatin to directly attenuate IGF-Akt signaling. SIRT6-deficient mice developed cardiac hypertrophy and heart failure, whereas SIRT6 transgenic mice were protected from hypertrophic stimuli, indicating that SIRT6 acts as a negative regulator of cardiac hypertrophy. SIRT6-deficient mouse hearts showed hyperactivation of IGF signaling–related genes and their downstream targets. Mechanistically, SIRT6 binds to and suppresses the promoter of IGF signaling–related genes by interacting with c-Jun and deacetylating histone 3 at Lys9 (H3K9). We also found reduced SIRT6 expression in human failing hearts. These findings disclose a new link between SIRT6 and IGF-Akt signaling and implicate SIRT6 in the development of cardiac hypertrophy and failure.
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We thank F. Alt, Harvard Medical School, for providing SIRT6 knockout mice, E. Verdin, University of California, San Francisco, for providing Flag-SIRT6 wild-type and mutant plasmids, F. VanGool, Institut de Biologie, Universite Libre de Bruxelles, Gosselies, Belgium, for providing mouse-SIRT6 expression plasmid and K. Chua, Stanford University, for providing SIRT6 retroviral vectors and SIRT6 knockout MEFs. The α-MHC promoter vector used to make cardiac-specific SIRT6 transgenic mice was provided by J. Robbins, University of Cincinnati. This study was supported by US National Institutes of Health grants RO1 HL-117041, HL-83423 and 111455 to M.P.G. N.R.S. was supported by a postdoctoral fellowship from the American Heart Association.
The authors declare no competing financial interests.
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Sundaresan, N., Vasudevan, P., Zhong, L. et al. The sirtuin SIRT6 blocks IGF-Akt signaling and development of cardiac hypertrophy by targeting c-Jun. Nat Med 18, 1643–1650 (2012). https://doi.org/10.1038/nm.2961
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