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Sun A, Zou Y, Wang P, Xu D, Gong H, Wang S, Qin Y, Zhang P, Chen Y, Harada M, Isse T, Kawamoto T, Fan H, Yang P, Akazawa H, Nagai T, Takano H, Ping P, Komuro I, Ge J. Mitochondrial aldehyde dehydrogenase 2 plays protective roles in heart failure after myocardial infarction via suppression of the cytosolic JNK/p53 pathway in mice. J Am Heart Assoc 2014; 3:e000779. [PMID: 25237043 PMCID: PMC4323818 DOI: 10.1161/jaha.113.000779] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Background Increasing evidence suggests a critical role for mitochondrial aldehyde dehydrogenase 2 (ALDH2) in protection against cardiac injuries; however, the downstream cytosolic actions of this enzyme are largely undefined. Methods and Results Proteomic analysis identified a significant downregulation of mitochondrial ALDH2 in the heart of a rat heart failure model after myocardial infarction. The mechanistic insights underlying ALDH2 action were elucidated using murine models overexpressing ALDH2 or its mutant or with the ablation of the ALDH2 gene (ALDH2 knockout) and neonatal cardiomyocytes undergoing altered expression and activity of ALDH2. Left ventricle dilation and dysfunction and cardiomyocyte death after myocardial infarction were exacerbated in ALDH2‐knockout or ALDH2 mutant‐overexpressing mice but were significantly attenuated in ALDH2‐overexpressing mice. Using an anoxia model of cardiomyocytes with deficiency in ALDH2 activities, we observed prominent cardiomyocyte apoptosis and increased accumulation of the reactive aldehyde 4‐hydroxy‐2‐nonenal (4‐HNE). We subsequently examined the impacts of mitochondrial ALDH2 and 4‐HNE on the relevant cytosolic protective pathways. Our data documented 4‐HNE‐stimulated p53 upregulation via the phosphorylation of JNK, accompanying increased cardiomyocyte apoptosis that was attenuated by inhibition of p53. Importantly, elevation of 4‐HNE also triggered a reduction of the cytosolic HSP70, further corroborating cytosolic action of the 4‐HNE instigated by downregulation of mitochondrial ALDH2. Conclusions Downregulation of ALDH2 in the mitochondria induced an elevation of 4‐HNE, leading to cardiomyocyte apoptosis by subsequent inhibition of HSP70, phosphorylation of JNK, and activation of p53. This chain of molecular events took place in both the mitochondria and the cytosol, contributing to the mechanism underlying heart failure.
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Affiliation(s)
- Aijun Sun
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
| | - Yunzeng Zou
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
| | - Ping Wang
- Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan (P.W., Y.Q., M.H., T.N., H.T.)
| | - Danling Xu
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
| | - Hui Gong
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
| | - Shijun Wang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
| | - Yingjie Qin
- Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan (P.W., Y.Q., M.H., T.N., H.T.)
| | - Peng Zhang
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
| | - Yunqin Chen
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
| | - Mutsuo Harada
- Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan (P.W., Y.Q., M.H., T.N., H.T.)
| | - Toyoshi Isse
- Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health, Fukuoka, Japan (T.I., T.K.)
| | - Toshihiro Kawamoto
- Department of Environmental Health, School of Medicine, University of Occupational and Environmental Health, Fukuoka, Japan (T.I., T.K.)
| | - Huizhi Fan
- Department of Chemistry and Proteome Research Center, Institutes of Biomedical Sciences, Fudan University, Shanghai, China (H.F., P.Y.)
| | - Pengyuan Yang
- Department of Chemistry and Proteome Research Center, Institutes of Biomedical Sciences, Fudan University, Shanghai, China (H.F., P.Y.)
| | - Hiroshi Akazawa
- Department of Cardiovascular Medicine, University of Tokyo Graduate School of Medicine, Tokyo, Japan (H.A., I.K.)
| | - Toshio Nagai
- Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan (P.W., Y.Q., M.H., T.N., H.T.)
| | - Hiroyuki Takano
- Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine, Chiba, Japan (P.W., Y.Q., M.H., T.N., H.T.)
| | - Peipei Ping
- Division of Cardiology, Departments of Physiology and Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA (P.P.)
| | - Issei Komuro
- Department of Cardiovascular Medicine, University of Tokyo Graduate School of Medicine, Tokyo, Japan (H.A., I.K.)
| | - Junbo Ge
- Shanghai Institute of Cardiovascular Diseases, Zhongshan Hospital and Institutes of Biomedical Sciences, Fudan University, Shanghai, China (A.S., Y.Z., D.X., H.G., S.W., P.Z., Y.C., J.G.)
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