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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Med
2012 ; 18
(11
): 1643-50
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The sirtuin SIRT6 blocks IGF-Akt signaling and development of cardiac hypertrophy
by targeting c-Jun
#MMPMID23086477
Sundaresan NR
; Vasudevan P
; Zhong L
; Kim G
; Samant S
; Parekh V
; Pillai VB
; Ravindra PV
; Gupta M
; Jeevanandam V
; Cunningham JM
; Deng CX
; Lombard DB
; Mostoslavsky R
; Gupta MP
Nat Med
2012[Nov]; 18
(11
): 1643-50
PMID23086477
show ga
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.
|*Cardiomegaly/genetics/metabolism
[MESH]
|*Heart Failure/genetics/metabolism
[MESH]
|*JNK Mitogen-Activated Protein Kinases
[MESH]
|*Oncogene Protein v-akt/genetics/metabolism
[MESH]