Document Detail

Biomechanical and phenotypic changes in the vasospastic canine basilar artery after subarachnoid hemorrhage.
MedLine Citation:
PMID:  16051708     Owner:  NLM     Status:  MEDLINE    
Because it has been argued that active myogenic tone prolongs cerebral vasospasm for >2 wk after subarachnoid hemorrhage (SAH), we attempted to identify the mechanism that plays the main role in sustaining the prolonged cerebral vasospasm. We especially focused on the roles of biomechanical and phenotypic changes in the cerebral arteries in the mechanisms of prolonged vasospasm after SAH. We used the basilar arteries from a "two-hemorrhage" canine model to make serial measurements of maximal contraction capacity and arterial stiffness (papaverine-insensitive tone) until day 28. We also examined hematoxylin-eosin-stained vasospastic canine basilar arteries for histological changes and immunohistochemically examined them for expression of myosin heavy chain isoforms (SMemb, SM1, and SM2), which are markers of smooth muscle phenotypic changes. Changes in collagen concentration in canine basilar arteries were also measured. Angiographic cerebral vasospasm persisted until day 14 and then gradually diminished; artery diameter returned to the control diameters on day 28. Maximal contraction capacity decreased until day 21 and showed some recovery by day 28. Arterial stiffness, on the other hand, progressed until day 28. Histological examination revealed medial thickening and increased connective tissue until day 21 and a return to control findings by day 28. The increased connective tissue was not accompanied by changes in collagen concentration, suggesting a role of some other protein in the increase in connective tissue. Immunohistochemical studies with anti-SMemb, anti-SM1, and anti-SM2 antibodies showed enhanced expression of SMemb from day 7 to day 21 and disappearance of SM1 and SM2 on days 14 and 21. The changes in myosin heavy chain isoform expression returned to normal on day 28. The above results indicate that biomechanical and phenotypic changes may play a pivotal role in sustaining cerebral vasospasm for >2 wk after SAH, with minimal changes in active myogenic arterial tone.
Mitsuo Yamaguchi-Okada; Shigeru Nishizawa; Masayo Koide; Yuichiro Nonaka
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Publication Detail:
Type:  Journal Article     Date:  2005-07-28
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  99     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2005 Nov 
Date Detail:
Created Date:  2005-10-17     Completed Date:  2005-12-14     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2045-52     Citation Subset:  IM    
Department of Neurosurgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Hamamatsu, Shizuoka, 431-3192 Japan.
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MeSH Terms
Basilar Artery / metabolism,  pathology,  physiopathology*
Collagen / metabolism
Isometric Contraction
Muscle, Smooth, Vascular / pathology,  physiopathology
Myosin Heavy Chains / metabolism
Subarachnoid Hemorrhage / pathology*,  physiopathology*
Vasospasm, Intracranial / pathology*,  physiopathology*
Reg. No./Substance:
0/Myosin Heavy Chains; 9007-34-5/Collagen

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