| Effects of platelet-activating factor on beta- and H2-receptor-mediated increase of myocardial contractile force in isolated perfused guinea pig hearts. | |
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MedLine Citation:
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PMID: 1852056 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Platelet-activating factor (PAF) has been termed an important mediator of cardiovascular shock due to immunological reactions, including anaphylaxis and endotoxic reactions. Previous studies have shown that PAF is a potent cardiodepressive agent inducing a drastic coronary constriction and a sustained impairment of myocardial contractility. In this study, an attempt was made to further characterize the prolonged PAF effects on coronary circulation and myocardial contractile force in the isolated guinea pig heart perfused at constant pressure. An intracoronary PAF bolus (0.18 nmol, related to coronary flow rates of 1 ml/min) induced a precipitous decrease of coronary flow rates, left ventricular pressure, and left ventricular contraction (peak positive dP/dt), which was followed by a slow increase reaching new steady state after 15 min (-48%, -40%, -42% below baseline, respectively). If the specific PAF antagonist WEB 2086 (3.65 nmol/min, related to coronary flow rates of 1 ml/min) was infused 30 min after PAF administration, the prolonged PAF-mediated cardio-depressive effects were rapidly reversed. Several studies indicate that PAF induces a down regulation of beta-adrenoreceptors in different cell types, including human lung tissue. Therefore, a further objective of the study was to evaluate whether PAF selectively impairs the positive inotropic effects of beta-receptor agonists or also inhibits the contractile effects of inotropic drugs, which are known to enhance cardiac contractility independently of beta-receptors. In these experiments, the beta-agonist isoproterenol and the H2-agonist impromidine were administered as intracoronary boluses (0.35 nmol and 0.14 nmol, respectively, related to coronary flow rates of 1 ml/min) prior to PAF injection and 30 min after PAF.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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S B Felix; G Baumann; M Niemczyk; Z Ahmad; T Hashemi; W E Berdel |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Research in experimental medicine. Zeitschrift für die gesamte experimentelle Medizin einschliesslich experimenteller Chirurgie Volume: 191 ISSN: 0300-9130 ISO Abbreviation: Res Exp Med (Berl) Publication Date: 1991 |
Date Detail:
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Created Date: 1991-06-24 Completed Date: 1991-06-24 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0324736 Medline TA: Res Exp Med (Berl) Country: GERMANY |
Other Details:
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Languages: eng Pagination: 1-9 Citation Subset: IM |
Affiliation:
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Department of Medicine I, Klinikum rechts der Isar, Technische Universität München, Federal Republic of Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Azepines / pharmacology Coronary Circulation / drug effects Drug Interactions Guanidines / pharmacology Guinea Pigs Heart Rate / drug effects Imidazoles / pharmacology Impromidine Isoproterenol / pharmacology Myocardial Contraction / drug effects* Platelet Activating Factor / pharmacology* Receptors, Adrenergic, beta / drug effects*, physiology Receptors, Histamine H2 / drug effects*, physiology Triazoles / pharmacology |
| Chemical | |
Reg. No./Substance:
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0/Azepines; 0/Guanidines; 0/Imidazoles; 0/Platelet Activating Factor; 0/Receptors, Adrenergic, beta; 0/Receptors, Histamine H2; 0/Triazoles; 105219-56-5/WEB 2086; 55273-05-7/Impromidine; 7683-59-2/Isoproterenol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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