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Tytuł pozycji:

Sirt1 promotes autophagy and inhibits apoptosis to protect cardiomyocytes from hypoxic stress

Tytuł :
Sirt1 promotes autophagy and inhibits apoptosis to protect cardiomyocytes from hypoxic stress
Autorzy :
Luo, Guiping
Jian, Zhao
Zhu, Yun
Zhu, Yu
Chen, Baicheng
Ma, Ruiyan
Tang, Fuqin
Xiao, Yingbin
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Temat :
sirtuin 1
cardiomyocytes
autophagy
biological phenomena, cell phenomena, and immunity
enzymes and coenzymes (carbohydrates)
apoptosis
AMP-activated protein kinase
environment and public health
Articles
inositol requiring kinase enzyme 1α
endocrine system diseases
hormones, hormone substitutes, and hormone antagonists
Źródło :
International Journal of Molecular Medicine
Wydawca :
D.A. Spandidos, 2019.
Rok publikacji :
2019
Oryginalny identyfikator :
pmc: PMC6443335
pmid: 30864731
Język :
English
ISSN :
1791-244X
1107-3756
DOI :
10.3892/ijmm.2019.4125
Sirtuin 1 (Sirt1) exerts its cardioprotective effects in various cardiovascular diseases via multiple cellular activities. However, the therapeutic implications of Sirt1 in hypoxic cardiomyocytes and the underlying mechanisms remain elusive. The present study investigated whether Sirt1 regulates autophagy and apoptosis in hypoxic H9C2 cardiomyocytes and in an experimental hypoxic mouse model. Right ventricular outflow tract biopsies were obtained from patients with cyanotic or acyanotic congenital heart diseases. Adenovirus Ad-Sirt1 was used to activate Sirt1 and Ad-Sh-Sirt1 was used to inhibit Sirt1 expression in H9C2 cells, in order to investigate the effect of Sirt1 on cellular autophagy and apoptosis. SRT1720, a pharmacological activator of Sirt1 and EX-527, a Sirt1 antagonist, were administered to mice to explore the role of Sirt1 in hypoxic cardiomyocytes in vivo. The levels of autophagy and apoptosis-related proteins were evaluated using western blotting. Apoptosis was investigated by TUNEL staining and Annexin V/7-aminoactinomycin D flow cytometry analysis. Heart tissue samples from cyanotic patients exhibited increased autophagy and apoptosis, as well as elevated Sirt1 levels, compared with the noncyanotic control samples. The data from the western blot analysis revealed that Sirt1 promoted autophagic flux and reduced apoptosis in hypoxic H9C2 cells. In addition, Sirt1 activated AMP-activated protein kinase (AMPK), and the AMPK inhibitor Compound C abolished the effect of Sirt1 on autophagy activation. Further exploration of the mechanism revealed that Sirt1 protects hypoxic cardiomyocytes from apoptosis, at least in part, through inositol requiring kinase enzyme 1α (IRE1α). Consistent with the in vitro results, treatment with the Sirt1 activator SRT1720 activated AMPK, inhibited IRE1α, enhanced autophagy, and decreased apoptosis in the heart tissues of normoxic mice compared with the hypoxia control group. Opposite changes were observed in hypoxic mice treated with the Sirt1 inhibitor EX-527. These results suggested that Sirt1 promoted autophagy via AMPK activation and reduced hypoxia-induced apoptosis via the IRE1α pathway, to protect cardiomyocytes from hypoxic stress.

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