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Anti-apoptotic effect of hyperbaric oxygen preconditioning on a rat model of myocardial infarction.
MedLine Citation:
PMID:  20421116     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND: In our previous study, it was indicated that hyperbaric oxygen preconditioning (HOP) could induce a preconditioning against myocardial infarction and promote neovascularization. In this study, attempts were made to investigate whether a modified short-term pre-exposure protocol could also induce cardioprotection, and its potential mechanisms.
MATERIALS AND METHODS: Adult male Sprague Dawley rats were divided into seven groups; group 1 was sham surgery (SHAM) and group 2 was pre-exposed to normal air (CTL), and the other groups to HOP 1, 6, 24, 48, and 72 h (H1, H6, H24, H48, H72 groups) before permanent ischemia. The infarct size was measured by triphenyltetrazolium chloride staining, and left ventricular function parameters were recorded. The extent of apoptosis was determined by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL)-positive staining. Caspase-3 activity, Bcl-2, and Bax expression were also measured.
RESULTS: Compared with CTL group, myocardial infarct size was significantly decreased as well as cardiac cell apoptosis in area at risk zones (AAR) in H48 group. Meanwhile, the activity of caspase 3 was reduced, the ratio of Bcl-2/Bax expression was up-regulated, and the heart function parameters, including left ventricular systolic pressure (LVSP), left ventricular diastolic pressure (LVEDP), +(dP/dt)(max), and -(dP/dt)(max) were also significantly improved after preconditioning in H48 group.
CONCLUSION: The results indicate that short-term HOP could induce cardioprotection and may not last for more than 24 h. HOP prevents myocardium from permanent ischemia injury by suppression of apoptotic pathways.
Qiang Sun; Qing Sun; Yun Liu; Xuejun Sun; Hengyi Tao
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Publication Detail:
Type:  Journal Article     Date:  2010-02-16
Journal Detail:
Title:  The Journal of surgical research     Volume:  171     ISSN:  1095-8673     ISO Abbreviation:  J. Surg. Res.     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-10-17     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376340     Medline TA:  J Surg Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  41-6     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Department of Diving Medicine, Faculty of Naval Medicine, Second Military Medical University, Shanghai, P. R. China.
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