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Vascular rhexis in mice subjected to non-sustained myocardial ischemia and its therapeutic implications.
MedLine Citation:
PMID:  21521712     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We previously described the death of vascular cells (vascular rhexis) following persistent coronary occlusion. The present study was designed to determine whether non-sustained ischemia can initiate vascular rhexis and if so, whether relatively brief ischemic insults are sufficient. C57BL6 mice were subjected to coronary ligation for 15 min or 3 h followed by reperfusion. Soluble fractions of left ventricular (LV) homogenates were obtained 48 h after the onset of transitory coronary occlusion. They were assayed by Western blotting for quantification of alpha smooth muscle actin (α-SMA) and smooth muscle myosin heavy chain (SM-MHC) that we have shown reflect vascular rhexis delineated immunohistochemically. Non-sustained coronary occlusion for 3 h initiated vascular rhexis evident 45 h after reperfusion, but not earlier, as judged from Western blotting of α-SMA and SM-MHC. The number of small- and medium-sized vessels in the previously ischemic zones was reduced at 45 h after reperfusion as well. Thus, vascular rhexis occurs after ischemia as brief as 3 h but evolves slowly and is not evident for 45 h. The delayed disintegration of the vasculature makes it likely that it can be ameliorated by interventions initiated after non-sustained ischemia, rendering it an attractive target for diminution of phenomena such as late negative LV remodeling, and 'no reflow.'
Authors:
A K M Tarikuz Zaman; Christopher J French; Jeffrey L Spees; Azan S Binbrek; Burton E Sobel
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-26
Journal Detail:
Title:  Experimental biology and medicine (Maywood, N.J.)     Volume:  -     ISSN:  1535-3699     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100973463     Medline TA:  Exp Biol Med (Maywood)     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Medicine, Cardiovascular Research Institute, University of Vermont, Colchester Research Facility, 208 South Park Drive, Colchester, VT 05446, USA.
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