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Redox Biol. 2018 Jul;17:25-34. doi: 10.1016/j.redox.2018.04.009. Epub 2018 Apr 7.

GCN2 deficiency ameliorates doxorubicin-induced cardiotoxicity by decreasing cardiomyocyte apoptosis and myocardial oxidative stress.

Author information

1
College of Life Science, University of Chinese Academy of Sciences, 19 A Yuquanlu, Beijing 100049, China.
2
College of Life Science, University of Chinese Academy of Sciences, 19 A Yuquanlu, Beijing 100049, China. Electronic address: luzhongbing@ucas.ac.cn.

Abstract

The clinical use of doxorubicin for cancer therapy is limited by its cardiotoxicity, which involves cardiomyocyte apoptosis and oxidative stress. Previously, we showed that general control nonderepressible 2 (GCN2), an eukaryotic initiation factor 2α (eIF2α) kinase, impairs the ventricular adaptation to chronic pressure overload by affecting cardiomyocyte apoptosis. However, the impact of GCN2 on Dox-induced cardiotoxicity has not been investigated. In the present study, we treated wild type (WT) and Gcn2-/- mice with four intraperitoneal injections (5 mg/kg/week) to induce cardiomyopathy. After Dox treatment, Gcn2-/- mice developed less contractile dysfunction, myocardial fibrosis, apoptosis, and oxidative stress compared with WT mice. In the hearts of the Dox-treated mice, GCN2 deficiency attenuated eIF2α phosphorylation and induction of its downstream targets, activating transcription factor 4 (ATF4) and C/EBP homologous protein (CHOP), and preserved the expression of anti-apoptotic factor Bcl-2 and mitochondrial uncoupling protein-2(UCP2). Furthermore, we found that GCN2 knockdown attenuated, whereas GCN2 overexpression exacerbated, Dox-induced cell death, oxidative stress and reduction of Bcl-2 and UCP2 expression through the eIF2α-CHOP-dependent pathway in H9C2 cells. Collectively, our data provide solid evidence that GCN2 has a marked effect on Dox induced myocardial apoptosis and oxidative stress. Our findings suggest that strategies to inhibit GCN2 activity in cardiomyocyte may provide a novel approach to attenuate Dox-related cardiotoxicity.

KEYWORDS:

CHOP; Cardiotoxicity; Doxorubicin; GCN2; Oxidative stress; UCP2

PMID:
29660505
PMCID:
PMC6006681
DOI:
10.1016/j.redox.2018.04.009
[Indexed for MEDLINE]
Free PMC Article

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