Document Detail


Neurogenic modification of the vulnerability of the blood-brain barrier during acute hypertension in conscious rats.
MedLine Citation:
PMID:  6410686     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To study the possible influence of sympathetic adrenergic tone on the blood-brain barrier function during acute hypertension in conscious unrestrained rats with indwelling catheters in the aorta and a jugular vein the blood pressure was increase by noradrenaline, 6-hydroxydopamine (6-OHDA) or baclofen. One or 60 min later the rats were sacrificed and the extravasation of 125I labelled albumin determined in the brain. After i.v. injection of noradrenaline the baroreceptor reflex will decrease the sympathetic tone whereas the blood pressure increased induced by the other two drugs is accompanied by an increased sympathetic activity. One minute after a corresponding rise in blood pressure the albumin content in the brain was considerably lower in rats given 6-OHDA than in those given noradrenaline. 60 min after the injection of 6-OHDA or baclofen the extravasation in the brain did not differ despite a considerably more rapid increase in pressure after 6-OHDA. Pretreatment with clonidine increased the blood-brain barrier dysfunction in rats given 6-OHDA but not in those given baclofen, probably because the slower rise in pressure facilitates myogenic autoregulation. It is concluded that neurogenic influences on vessel tone can modify the response of the blood-brain barrier during acute hypertension in conscious rats.
Authors:
B B Johansson; L M Auer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  117     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  1983 Apr 
Date Detail:
Created Date:  1983-09-23     Completed Date:  1983-09-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  SWEDEN    
Other Details:
Languages:  eng     Pagination:  507-11     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adrenergic Fibers / drug effects*
Animals
Baclofen / pharmacology*
Blood-Brain Barrier / drug effects*
Carbon Dioxide / blood
Clonidine / pharmacology*
Hydroxydopamines / pharmacology*
Hypertension / physiopathology*
Male
Norepinephrine / pharmacology*
Oxidopamine
Oxygen / blood
Partial Pressure
Rats
Rats, Inbred Strains
Serum Albumin, Radio-Iodinated / cerebrospinal fluid*
Chemical
Reg. No./Substance:
0/Hydroxydopamines; 0/Serum Albumin, Radio-Iodinated; 1134-47-0/Baclofen; 1199-18-4/Oxidopamine; 124-38-9/Carbon Dioxide; 4205-90-7/Clonidine; 51-41-2/Norepinephrine; 7782-44-7/Oxygen

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


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