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ANG II promotes IGF-IIR expression and cardiomyocyte apoptosis by inhibiting HSF1 via JNK activation and SIRT1 degradation.

Authors: Huang, CY  Kuo, WW  Yeh, YL  Ho, TJ  Lin, JY  Lin, DY  Chu, CH  Tsai, FJ  Tsai, CH  Huang, CY 
Citation: Huang CY, etal., Cell Death Differ. 2014 Aug;21(8):1262-74. doi: 10.1038/cdd.2014.46. Epub 2014 May 2.
Pubmed: (View Article at PubMed) PMID:24786827
DOI: Full-text: DOI:10.1038/cdd.2014.46

Hypertension-induced cardiac hypertrophy and apoptosis are major characteristics of early-stage heart failure. Our previous studies found that the activation of insulin-like growth factor receptor II (IGF-IIR) signaling was critical for hypertensive angiotensin II (ANG II)-induced cardiomyocyte apoptosis. However, the detailed mechanism by which ANG II regulates IGF-IIR in heart cells remains elusive. In this study, we found that ANG II activated its downstream kinase JNK to increase IGF-IIR expression through the ANG II receptor angiotensin type 1 receptor. JNK activation subsequently led to sirtuin 1 (SIRT1) degradation via the proteasome, thus preventing SIRT1 from deacetylating heat-shock transcription factor 1 (HSF1). The resulting increase in the acetylation of HSF1 impaired its ability to bind to the IGF-IIR promoter region (nt -748 to -585). HSF1 protected cardiomyocytes by acting as a repressor of IGF-IIR gene expression, and ANG II diminished this HSF1-mediated repression through enhanced acetylation, thus activating the IGF-IIR apoptosis pathway. Taken together, these results suggest that HSF1 represses IGF-IIR gene expression to protect cardiomyocytes. ANG II activates JNK to degrade SIRT1, resulting in HSF1 acetylation, which induces IGF-IIR expression and eventually results in cardiac hypertrophy and apoptosis. HSF1 could be a valuable target for developing treatments for cardiac diseases in hypertensive patients.

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CRRD Object Information
CRRD ID: 10402547
Created: 2015-10-26
Species: All species
Last Modified: 2015-10-26
Status: ACTIVE



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