Document Detail


Characteristics of cerebral ischemia in major rat stroke models of middle cerebral artery ligation through craniectomy.
MedLine Citation:
PMID:  23205677     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: The refinement of experimental stroke models is important for further development of neuroprotective interventions. AIMS AND/OR HYPOTHESIS: Our goal was to study the reproducibility of outcomes obtained in five rat models of middle cerebral artery (MCA) ligation in order to identify the optimal model for the preclinical studies. METHODS: In Part 1 of the experiments, systolic blood flow velocity (sBFV) and cerebral area at risk (AR) were determined immediately after the onset of brain ischemia induced in different ways in Wistar rats. After that, another set of experiments was performed (Part 2 of the experiments), now aimed at the assessment of the delayed outcome of five different models of cerebral ischemia designated as Versions 1-5. The versions were: Version 1 - 40-minute left MCA (LMCA) occlusion with reperfusion; Version 2 - permanent LMCA ligation; Version 3 - permanent ligation of both LMCA and left common carotid artery (CCA); Version 4 - permanent LMCA and bilateral CCA (bCCA) ligation; Version 5 - permanent LMCA ligation and 40-minute bCCA occlusion. The infarct size (IS) was quantified using triphenyltetrazolium chloride staining. The severity of neurological deficit was assessed by the Garcia score. The extent of brain edema was determined by calculating the difference in volumes of affected and contralateral hemispheres. RESULTS: Within a relatively big AR, Versions 1 and 2 resulted in a small IS [0·2 (0·0; 0·4)% and 0·3 (0·0; 0·7)%, respectively, P > 0·05]. Unlike that and comparable with AR, Version 3 resulted in a greater, albeit more variable IS [5·9 (2·1; 8·3)%, P < 0·0001 vs. Version 2]. Also comparable with AR, Versions 4 and 5 produced greatest values of IS [14·5 (11·4; 17·9)% and 11·3 (10·1; 14·2)%, respectively]; this parameter was most reproducible in Version 5. A significant decrease in neurological deficit score was found in Versions 4 and 5. Again, the reproducibility of the data on neurological outcome was higher in Version 5 versus Version 4. CONCLUSIONS: Comparative analysis of several Versions of focal cerebral ischemia within a single study might be helpful in better understanding of the mechanisms underlying the development and aftermath of stroke. Permanent LMCA ligation plus transient bilateral CCA occlusion produced most consistent results and might be recommended for preclinical studies.
Authors:
Alexey Shmonin; Elena Melnikova; Michael Galagudza; Timur Vlasov
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-4
Journal Detail:
Title:  International journal of stroke : official journal of the International Stroke Society     Volume:  -     ISSN:  1747-4949     ISO Abbreviation:  Int J Stroke     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101274068     Medline TA:  Int J Stroke     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 The Authors. International Journal of Stroke © 2012 World Stroke Organization.
Affiliation:
Institute of Experimental Medicine, V.A. Almazov Federal Heart, Blood and Endocrinology Center, St-Petersburg, Russian Federation; Department of Neurology, I.P. Pavlov Federal Medical University, St-Petersburg, Russian Federation.
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