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学科主题: 基础医学
题名:
Intermedin Suppresses Pressure Overload Cardiac Hypertrophy through Activation of Autophagy
作者: Chen, HuaLi1; Wang, Xue1; Tong, MingMing1; Wu, Dan1; Wu, Sisi1; Chen, JiaXiang1; Wang, XiaoXiao1; Wang, XuLei1,2; Kang, Yu3,4; Tang, Hong3; Tang, ChaoShu5; Jiang, Wei1
刊名: PLOS ONE
发表日期: 2013-05-29
DOI: 10.1371/journal.pone.0064757
卷: 8, 期:5
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology
类目[WOS]: Multidisciplinary Sciences
研究领域[WOS]: Science & Technology - Other Topics
关键词[WOS]: RAT VENTRICULAR MYOCYTES ; HEART-FAILURE ; EXPRESSION ; PEPTIDE ; ADRENOMEDULLIN-2 ; HOMEOSTASIS ; INHIBITION ; GROWTH ; CELLS
英文摘要:

Left ventricular hypertrophy is a maladaptive response to pressure overload and an important risk factor for heart failure. Intermedin (IMD), a multi-functional peptide, plays important roles in cardiovascular protection. In this study, we revealed an autophagy-dependent mechanism involved in IMD′s protection against cardiac remodeling and cardiomyocyte death in heart hypertrophy. We observed that transverse aortic contraction (TAC) induction, Ang II or ISO exposure induced remarkable increase in the expression of endogenous IMD and its receptor components, CRLR, RAMP1 and RAMP3, in mouse hearts and H9c2 cell cultures, respectively. Furthermore, the heart size, heart weight/body weight ratios, cardiomyocyte size and apoptosis, interstitial collagen, hypertrophic markers including ANP and BNP expression were also significantly increased, which were effectively suppressed by IMD supplementation. In addition, IMD induced capillary angiogenesis and improved functions in hypertrophic hearts. We further observed that IMD induced strong autophagy in hypertrophic hearts and cultured cells, which was paralleling with the decrease in cardiomyocyte size and apoptosis. Furthermore, an autophagy inhibitor, 3-MA, was used to block the IMD-augmented autophagy level, and then the protection of IMD on cardiomyocyte hypertrophy and apoptosis was almost abrogated. We also observed that IMD supplementation stirred intracellular cAMP production, and augmented the ERK1/2 phosphorylation induced by Ang II/ISO exposure in H9c2 cells. In addition, we inhibited PI3K, PKA and MAPK/ERK1/2 signaling pathways by using wortamannin, H89 and PD98059, respectively, in H9c2 cells co-incubating with both IMD and Ang II or ISO, and observed that these inhibitors effectively reduced IMD-augmented autophagy level, but only H89 and PD98059 pre-incubation abrogated the anti-apoptotic action of IMD. These results indicate that the endogenous IMD and its receptor complexes are induced in hypertrophic cardiomyocytes and proposed to play an important role in the pathogenesis of cardiac hypertrophy, and the autophagy stirred by IMD supplementation is involved in its protection against cardiomyocyte hypertrophy and apoptosis through the activation of both cAMP/PKA and MAPK/ERK1/2 pathways.

语种: 英语
所属项目编号: 30871017 ; 31071001 ; 31271226 ; 81000056 ; 2009FZ0067 ; 2012ZX09501001-003
项目资助者: National Natural Science Foundation of China ; Key Projects in the Science and Technology Pillar Program of Sichuan Province ; National ST Major project
WOS记录号: WOS:000319725500050
Citation statistics:
内容类型: 期刊论文
版本: 出版稿
URI标识: http://ir.bjmu.edu.cn/handle/400002259/57296
Appears in Collections:基础医学院_生理学与病理生理学系_期刊论文

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作者单位: 1.Sichuan Univ, West China Hosp, Mol Med Res Ctr, State Key Lab Biotherapy, Chengdu 610064, Sichuan, Peoples R China
2.Southwest Jiaotong Univ, Sch Life Sci & Bioengn, Chengdu, Sichuan, Peoples R China
3.Sichuan Univ, Dept Cardiol, West China Hosp, Chengdu 610064, Sichuan, Peoples R China
4.Chengdu Univ Tradit Chinese Med, Teaching Hosp, Chengdu, Sichuan, Peoples R China
5.Peking Univ, Dept Physiol, Hlth Sci Ctr, Beijing 100871, Peoples R China

Recommended Citation:
Chen, HuaLi,Wang, Xue,Tong, MingMing,et al. Intermedin Suppresses Pressure Overload Cardiac Hypertrophy through Activation of Autophagy[J]. PLOS ONE,2013,8(5).
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