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Hypertension impairs leptomeningeal collateral growth after common carotid artery occlusion: restoration by antihypertensive treatment.
MedLine Citation:
PMID:  21046561     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Chronic mild hypoperfusion has been shown to enlarge pial collateral vessels in normal mouse brains. The purpose of this study was to clarify the effect of hypertension on pial collateral vessel development after chronic hypoperfusion using spontaneously hypertensive rats (SHR). In normotensive rats, unilateral common carotid artery (CCA) occlusion enlarged leptomeningeal collateral vessels. CCA occlusion also preserved residual cerebral blood flow (CBF) and attenuated infarct size after middle cerebral artery (MCA) occlusion 14 days later. In contrast, in SHR, CCA occlusion neither enlarged the leptomeningeal anastomosis nor showed protective effects after MCA occlusion. However, decreasing blood pressure using an angiotensin II AT1 receptor blocker restored the beneficial effect of CCA occlusion on collateral growth as well as on residual CBF and infarct size after MCA occlusion. Adaptive responses in CBF autoregulation curves observed 14 days after CCA occlusion in normotensive rats were impaired in untreated SHR, but were restored after antihypertensive treatment. In conclusion, SHR have impaired leptomeningeal collateral growth after CCA occlusion, but antihypertensive treatment restores the beneficial effect of CCA occlusion on collateral circulation.
Authors:
Emi Omura-Matsuoka; Yoshiki Yagita; Tsutomu Sasaki; Yasukazu Terasaki; Naoki Oyama; Yukio Sugiyama; Kenichi Todo; Saburo Sakoda; Kazuo Kitagawa
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of neuroscience research     Volume:  89     ISSN:  1097-4547     ISO Abbreviation:  J. Neurosci. Res.     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2010-11-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7600111     Medline TA:  J Neurosci Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  108-16     Citation Subset:  IM    
Copyright Information:
© 2010 Wiley-Liss, Inc.
Affiliation:
Department of Neurology, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
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