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Early activation of myocardial matrix metalloproteinases and degradation of cardiac troponin I after experimental subarachnoid hemorrhage.
MedLine Citation:
PMID:  22475348     Owner:  NLM     Status:  Publisher    
BACKGROUND: Matrix metalloproteinases (MMPs) are involved in acute myocardial dysfunction by degrading several intracellular contractile proteins, including cardiac troponin I (cTnI). Here, we examined the temporal profiles of MMPs and cTnI in plasma and myocardial tissue in the acute stage of subarachnoid hemorrhage (SAH). MATERIALS AND METHODS: SAH was induced by the endovascular suture method in rats. Intracranial pressure and left ventricular (LV) function were recorded. Plasma cTnI and MMPs were measured at 0, 5, 15, 30, 60, 120, and 180 minutes after SAH. Myocardial cTnI and MMP activities were quantified at 30, 60 and 180 min after SAH from homogenized hearts. RESULTS: SAH-induced rats showed a marked decline in -LV dP/dt(max) (index of LV diastolic function). Plasma samples revealed a noticeable increase in cTnI and pro-MMP-9 activities over the course of 180 minutes. In myocardial tissue, there was a marked increase in pro-MMP-9, pro-MMP-2 activities and expression of activated MMP-2. Western blot analysis revealed a striking decrease in cTnI content and increase in cTnI degradation in myocardium. Simultaneous cTnI depletion and MMP-2 expression in myocardium was detected by immunohistochemistry as early as 30 minutes after SAH. MMPs correlated with -LV dP/dt(max) (% of baseline) both in plasma and in myocardial tissue. Furthermore, activated MMP-2 activity correlated positively with cTnI degradation in myocardium. CONCLUSIONS: Early activation of MMPs was observed in myocardium and plasma following SAH. Activated MMP-2 may regulate proteolytic cTnI and contribute to myocardium stunning injury in SAH rats.
Nai-Nu Lin; Ching-Chang Cheng; Yen-Feng Lee; Yun-Ching Fu; Jiun-Sheng Chen; Shu-Peng Ho; Yung-Tsung Chiu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-28
Journal Detail:
Title:  The Journal of surgical research     Volume:  -     ISSN:  1095-8673     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-4-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376340     Medline TA:  J Surg Res     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier Inc. All rights reserved.
Department of Medical Education and Research, Taichung Veterans General Hospital, Taichung, Taiwan, ROC; Department of Veterinary Medicine, National Chung-Hsing University, Taichung, Taiwan, ROC.
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