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Zhou T, Han Z, Gu J, Chen S, Fan Y, Zhang H, Yin Y, Zhang J, Wang C. Angiotensin-converting enzyme-2 overexpression improves atrial electrical remodeling through TRPM7 signaling pathway. Oncotarget 2017; 8:78726-78733. [PMID: 29108260 PMCID: PMC5667993 DOI: 10.18632/oncotarget.20221] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Accepted: 07/17/2017] [Indexed: 12/30/2022] Open
Abstract
Atrial electrical remodeling is an important factor in the development and persistence of atrial fibrillation. The aim of this study was to examine the effects of atrial angiotensin-converting enzyme-2 overexpression on atrial electrical remodeling and to elucidate the molecular mechanisms underlying these effects. Twenty-eight male and female dogs were randomly divided into the following 4 groups: a sham-operation group, a control group, an adenovirus-enhanced green fluorescent protein (Ad-EGFP) gene group and an Ad-ACE2 gene group. All dogs in the Ad-EGFP and Ad-ACE2 groups were rhythmized at 450 bpm for 14 days. Two weeks later, all the dogs underwent thoracotomy and epicardial gene painting. On day 21 after gene transfer, all the animals were subjected to electrophysiological and molecular studies. AF induction rates and durations were significantly increased in the control and Ad-EGFP groups compared to the sham-operated and Ad-ACE2 groups. Transient receptor potential melastatin 7 (TRPM7) expression levels in the Ad-EGFP and control groups were significantly higher than those in the sham-operated and Ad-ACE2 groups. Basal [Mg2+]i was significantly decreased in siRNA transfected cells compared with control and non-silencing siRNA-transfected cells. Our results suggest that ACE2 overexpression suppresses atrial electrical remodeling and improves atrial function through the TRPM7 signaling pathway.
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Affiliation(s)
- Tingquan Zhou
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Zhihua Han
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Jun Gu
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Shaojie Chen
- Department of Cardiology, Shanghai First People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Yuqi Fan
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Huili Zhang
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Yuehui Yin
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Junfeng Zhang
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
| | - Changqian Wang
- Department of Cardiology, Shanghai Ninth People's Hospital, Shanghai JiaoTong University School of Medicine, Shanghai, China
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Zhou T, Wang Z, Fan J, Chen S, Tan Z, Yang H, Yin Y. Angiotensin-converting enzyme-2 overexpression improves atrial remodeling and function in a canine model of atrial fibrillation. J Am Heart Assoc 2015; 4:e001530. [PMID: 25792125 PMCID: PMC4392435 DOI: 10.1161/jaha.114.001530] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND Atrial fibrosis is an important factor in initiating and maintaining atrial fibrillation. The purpose of this study was to test the hypothesis that atrial angiotensin-converting enzyme-2 (ACE2) overexpression might inhibit atrial collagen accumulation and improve atrial remodeling in a canine atrial pacing model. METHODS AND RESULTS Thirty-two mongrel dogs of both genders were divided randomly into 4 groups: sham-operated, control, gene therapy with adenovirus-enhanced green fluorescent protein (Ad-EGFP), and gene therapy with Ad-ACE2. All of the dogs in the control, Ad-EGFP, and Ad-ACE2 groups were paced at 450 bpm for a period of 14 days. The dogs in the sham group were instrumented without pacing. After 2 weeks, all of the dogs underwent a thoracotomy operation and received epicardial gene painting. On post-gene transfer day 21, the animals underwent electrophysiology, histology, and molecular studies. The percentage of fibrosis in the Ad-ACE2 group was markedly lower than the percentage in the control and Ad-EGFP groups. Compared with the other groups, ACE2 expression was increased significantly in the Ad-ACE2 group. Compared with the sham and Ad-ACE2 groups, the expression levels of transforming growth factor-β1 and Smad3 were significantly higher in the Ad-EGFP and control groups; however, the expression levels of Smad7 were lower in the atrial tissue as detected by Western blot and reverse transcription polymerase chain reaction. CONCLUSIONS Our results demonstrate that the overexpression of ACE2 inhibits atrial collagen accumulation and improves left atrial remodeling and function in a canine model of atrial fibrillation. Thus, targeted gene ACE2 therapy provides a promising approach for the treatment of atrial fibrillation.
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Affiliation(s)
- Tingquan Zhou
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China (T.Z., Z.W., J.F., S.C., Z.T., H.Y., Y.Y.)
| | - Zhenglong Wang
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China (T.Z., Z.W., J.F., S.C., Z.T., H.Y., Y.Y.)
| | - Jinqi Fan
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China (T.Z., Z.W., J.F., S.C., Z.T., H.Y., Y.Y.)
| | - Shaojie Chen
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China (T.Z., Z.W., J.F., S.C., Z.T., H.Y., Y.Y.)
| | - Zhen Tan
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China (T.Z., Z.W., J.F., S.C., Z.T., H.Y., Y.Y.)
| | - Hanxuan Yang
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China (T.Z., Z.W., J.F., S.C., Z.T., H.Y., Y.Y.)
| | - Yuehui Yin
- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China (T.Z., Z.W., J.F., S.C., Z.T., H.Y., Y.Y.)
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