Document Detail


Thrombin reduces cerebral arterial contractions caused by cerebrospinal fluid from patients with subarachnoid hemorrhage.
MedLine Citation:
PMID:  10978044     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND AND PURPOSE: We observed that the second application of cerebrospinal fluid (CSF) from subarachnoid hemorrhage (SAH) patients onto cerebral arterial segments in vitro produces a greater contraction than does the initial application. It was hypothesized that the difference between the first and second applications of SAH CSF was due to the activity of thrombin. METHODS: Canine vertebrobasilar artery was removed under general anesthesia, cut into rings, and suspended in tissue culture baths so as to measure isometric tension. CSF was taken from patients 1 to 3 days after SAH via ventricular drains. CSF was administered in 10(-5) to 10(-1) dilutions. The thrombin antagonist hirudin (5 U) was administered before CSF in some experiments. The arterial tension response to pure oxyhemoglobin (10(-4) to 3.2 g/dL) and thrombin (10(-4) to 3.2 U/mL), administered alone or in combination, was also examined. RESULTS: Hirudin increased arterial tension generated on the initial application of SAH CSF but had no effect on the tension generated by the second application of the SAH CSF, suggesting that thrombin limits the tension generated by vasoconstrictive agents in the CSF. Thrombin and pure oxyhemoglobin administered together produced less tension than that generated in response to oxyhemoglobin administered alone; no additive response was observed by coadministering the 2 vasoconstrictive agents. CONCLUSIONS: In the presence of oxyhemoglobin, thrombin acts to reduce cerebral arterial tension. This interaction between thrombin and hemoglobin may account for the observation that the second application of CSF from SAH patients onto cerebral arterial segments in vitro produces a greater contraction than does the initial application.
Authors:
M K Borsody; G M DeGiovanni; L S Marton; R L Macdonald; B Weir
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Stroke; a journal of cerebral circulation     Volume:  31     ISSN:  1524-4628     ISO Abbreviation:  Stroke     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2000-10-17     Completed Date:  2000-10-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0235266     Medline TA:  Stroke     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2149-56     Citation Subset:  IM    
Affiliation:
Section of Neurosurgery, Department of Surgery, University of Chicago Medical Center and Pritzker School of Medicine, Chicago, IL, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Basilar Artery / drug effects
Cerebrospinal Fluid / physiology*
Dogs
Haplorhini
Hirudins / pharmacology
Humans
Oxyhemoglobins / pharmacology
Subarachnoid Hemorrhage / cerebrospinal fluid,  drug therapy*,  physiopathology
Thrombin / pharmacology
Vasoconstriction / drug effects*
Chemical
Reg. No./Substance:
0/Hirudins; 0/Oxyhemoglobins; EC 3.4.21.5/Thrombin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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