Loss of Angiotensin-Converting Enzyme 2 Exacerbates Myocardial Injury via Activation of the CTGF-Fractalkine Signaling Pathway

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概要

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• Background: Angiotensin-converting enzyme 2 (ACE2) has been implicated in human heart failure, but the mechanism remains elusive. We hypothesized that ACE2 deficiency would exacerbate angiotensin (Ang) II-mediated myocardial injury. Methods and Results: 10-week-old ACE2 knockout (ACE2KO) and wild-type mice received by mini-osmotic pump either AngII (1.5mg·kg–1·day–1) or saline for 2 weeks. ACE2 deficiency triggered greater increases in the expression of connective tissue growth factor (CTGF), fractalkine (FKN) and phosphorylated ERK1/2 in AngII-treated ACE2KO hearts. These changes were associated with greater activation of matrix metalloproteinase (MMP) 2, MMP9 and MT1-MMP and exacerbation of myocardial injury and dysfunction. In cultured cardiofibroblasts, exposure to AngII (100nmol/L) for 30min resulted in marked increases in superoxide production and expression of CTGF, FKN and phosphorylated ERK1/2, which were strikingly prevented by recombinant human ACE2 (rhACE2; 1mg/ml) and the CTGF-neutralizing antibody (5μg/ml), but were aggravated by ACE2 inhibitor DX600 (0.5μmol/L). These protective effects of rhACE2 were eradicated by the Ang-(1–7) antagonist A779 (1μmol/L). More intriguingly, rhACE2 treatment significantly abolished AngII-mediated increases in MMP2, MMP9 and MT1-MMP in cardiofibroblasts. Conclusions: Loss of ACE2 exacerbates AngII-mediated inflammation, myocardial injury and dysfunction in ACE2-deficient hearts via activation of the CTGF-FKN-ERK and MMP signaling. ACE2 gene may represent a potential candidate to prevent and treat myocardial injury and heart diseases.  (Circ J 2013; 77: 2997–3006)

• 一般社団法人 日本循環器学会の論文

著者

• Lu Lin

  Department Of Cardiology Rui Jin Hospital Jiao Tong University School Of Medicine

• SHEN Wei-Feng

  Department of Cardiology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

• Xu Ying-Le

  State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

• Zhu Ding-Liang

  State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

• Song Bei

  State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

• Zhang Zhen-Zhou

  State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

• Zhong Jiu-Chang

  State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

• Yu Xi-Yong

  Research Center of Medical Science, Guangdong General Hospital, Guangdong Academy of Medical Sciences

• Oudit Gavin

  Division of Cardiology, Department of Medicine, University of Alberta, Mazankowski Alberta Heart Institute

• Jin Hai-Yan

  State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

• Kassiri Zamaneh

  Division of Cardiology, Department of Medicine, University of Alberta, Mazankowski Alberta Heart Institute

• Gao Ping-Jin

  State Key Laboratory of Medical Genomics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine

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