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Therapeutic effect of intermittent hypobaric hypoxia on myocardial infarction in rats

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Abstract

Intermittent hypobaric hypoxia (IHH) preconditioning protects the heart against ischemic injuries. However, little is known about the therapeutic effect of IHH on myocardial infarction (MI). The aim of this study was to test whether IHH treatment influences infarct size and cardiac performance after MI. Seven days after sham operation or left anterior descending coronary artery ligation, male Sprague–Dawley rats were randomly exposed to normoxia or one 6-h period each day of IHH (5,000 m) for 14 and 28 days. Echocardiography analysis showed that IHH significantly reduced left ventricular (LV) dilation and improved cardiac performance after 14- or 28-day treatment compared with MI-normoxic groups. The improvement of LV function was further confirmed in isolated perfused MI-IHH hearts. Such protection was associated with attenuated infarct size, myocardial fibrosis, and apoptotic cardiomyocytes. IHH treatment also enhanced coronary flow and phosphorylation of heat shock protein 27 in both sham and MI groups compared with the control groups. In addition, IHH increased the capillary density and vascular endothelial growth factor expression in peri-infarcted zones compared with sham-IHH and MI-normoxic groups. Our data demonstrated for the first time that IHH treatment exerts a therapeutic effect on MI by attenuating progressive myocardial remodeling and improving myocardial contractility. IHH treatment might provide a unique and promising therapeutic approach for ischemic heart diseases.

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Acknowledgments

We are grateful to Dr. Zhi-Hu Qu for technical assistance in surgery of experimental myocardial infarction (MI) and to Dr. You-Yi Zhang and Dr. Ming Xu for the constructive discussion. This study was supported in part by Grants from the Major State Basic Research Development Program of China (2006CB504106, 2007CB512100) and Knowledge Innovation Program of the CAS (KSCX2-YW-R-75).

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Authors and Affiliations

  1. Key Laboratory of Stem Cell Biology and Laboratory of Molecular Cardiology, Institute of Health Sciences, Institutes for Biological Sciences (SIBS), Chinese Academy of Sciences (CAS) and Shanghai Jiao Tong University School of Medicine (SJTUSM), 225 Chong Qing Nan Rd, Bldg. No. 1 of Institute of Health Science, Shanghai, 200025, People’s Republic of China

    Wei-Qing Xu, Zhuo Yu, Yan Xie, Yi Zhu & Huang-Tian Yang

  2. Zhongshan Hospital, Fudan University, Shanghai, People’s Republic of China

    Guo-Qian Huang & Xian-Hong Shu

  3. Laboratory of Hypoxic Cardiovascular Physiology, SIBS, CAS, Shanghai, People’s Republic of China

    Zhao-Nian Zhou

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  1. Wei-Qing Xu
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Xu, WQ., Yu, Z., Xie, Y. et al. Therapeutic effect of intermittent hypobaric hypoxia on myocardial infarction in rats. Basic Res Cardiol 106, 329–342 (2011). https://doi.org/10.1007/s00395-011-0159-y

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