Document Detail


Possible activation of intracellular beta-adrenoceptors by extraneuronally accumulated isoprenaline in perfused rat heart.
MedLine Citation:
PMID:  2842696     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Two rat hearts were perfused in series by a modified Loewi's method. The recipient heart was perfused with the perfusate collected from the donor heart. 1. After perfusion with 3H-isoprenaline in the presence of tropolone, an inhibitor of catechol-O-methyltransferase, the donor heart was washed out with amine-free medium containing tropolone and corticosterone. The heart rate of the recipient heart increased after the change to the perfusate from the donor heart during the wash-out. After wash-out the heart rate of the donor heart (which had accumulated 43.4 pmol.g-1 3H-isoprenaline) was higher than that of the recipient heart (which had accumulated 0.44 pmol.g-1 3H-isoprenaline), and the rates of efflux of 3H-isoprenaline from both hearts were similar. 2. After perfusion with 3H-isoprenaline and corticosterone in the absence of tropolone, the enhanced heart rate of the donor heart decreased during wash-out with amine-free medium in the presence of corticosterone. The heart rate of the recipient heart increased after the medium change to the perfusate from the donor heart, and the heart rates in both hearts were similar after wash-out. Only small amounts of 3H-isoprenaline remained in both hearts after wash-out, and the rates of efflux of 3H-isoprenaline from both hearts were similar. 3. After perfusion with 3H-isoprenaline in the presence of tropolone, the effects of propranolol and atenolol on the heart rate during wash-out with amine-free medium containing tropolone and corticosterone were compared. The inhibitory effect of propranolol on the heart rate was significantly greater than that of atenolol.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
T Magaribuchi; K Kurahashi; M Fujiwara
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Naunyn-Schmiedeberg's archives of pharmacology     Volume:  337     ISSN:  0028-1298     ISO Abbreviation:  Naunyn Schmiedebergs Arch. Pharmacol.     Publication Date:  1988 May 
Date Detail:
Created Date:  1988-10-13     Completed Date:  1988-10-13     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0326264     Medline TA:  Naunyn Schmiedebergs Arch Pharmacol     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  531-8     Citation Subset:  IM    
Affiliation:
Department of Pharmacology, Faculty of Medicine, Kyoto University, Japan.
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MeSH Terms
Descriptor/Qualifier:
Animals
Corticosterone / pharmacology
Heart / drug effects
Heart Rate / drug effects
Isoproterenol / metabolism,  pharmacology*
Male
Myocardium / metabolism*
Neurons / metabolism
Rats
Rats, Inbred Strains
Receptors, Adrenergic, beta / drug effects,  metabolism*
Tropolone / pharmacology
Chemical
Reg. No./Substance:
0/Receptors, Adrenergic, beta; 50-22-6/Corticosterone; 533-75-5/Tropolone; 7683-59-2/Isoproterenol

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


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