| The effect of dehydroepiandrosterone on coronary blood flow in prepubertal anaesthetized pigs. | |
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MedLine Citation:
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PMID: 12702737 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Extensive research suspecting an association between plasma levels of dehydroepiandrosterone and the risk of coronary heart disease has not been conclusive. The present study was designed to investigate the effect of dehydroepiandrosterone on the coronary circulation and to determine the mechanisms involved. In prepubertal pigs of both sexes anaesthetized with sodium pentobarbitone, changes in left circumflex or anterior descending coronary flow caused by intravenous infusion of dehydroepiandrosterone were assessed using an electromagnetic flowmeter. Changes in heart rate and arterial pressure were prevented by atrial pacing and by connecting the arterial system to a pressurized reservoir containing Ringer solution. In 20 pigs, infusion of 1 mg h-1 of dehydroepiandrosterone caused a decrease in coronary flow without affecting left ventricular dP/dtmax (rate of change of left ventricular systolic pressure) and filling pressures of the heart. In a further eight pigs, a dose-response curve was obtained by graded increases in the infused dose of hormone between 0.03 and 4 mg h-1. The mechanisms of the above response were studied in the 20 pigs by repeating the experiment after haemodynamic variables had returned to the control values observed before infusion. Blockade of muscarinic cholinoceptors with intravenous atropine (five pigs) and of alpha-adrenoceptors with intravenous phentolamine (five pigs) did not affect the dehydroepiandrosterone-induced coronary vasoconstriction. This response was abolished by blockade of beta-adrenoceptors with intravenous propranolol (five pigs) and of coronary nitric oxide synthase with intracoronary injection of Nomega-nitro-L-arginine methyl ester (five pigs) even after reversing the increase in arterial pressure and coronary vascular resistance caused by the two blocking agents with intravenous infusion of papaverine. The present study showed that intravenous infusion of dehydroepiandrosterone primarily caused coronary vasoconstriction. The mechanisms of this response were shown to involve the inhibition of a vasodilatory beta-adrenergic receptor-mediated effect related to the release of nitric oxide. |
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Authors:
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C Molinari; A Battaglia; E Grossini; D A S G Mary; C Vassanelli; G Vacca |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2003-04-17 |
Journal Detail:
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Title: The Journal of physiology Volume: 549 ISSN: 0022-3751 ISO Abbreviation: J. Physiol. (Lond.) Publication Date: 2003 Jun |
Date Detail:
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Created Date: 2003-06-16 Completed Date: 2004-02-02 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 0266262 Medline TA: J Physiol Country: England |
Other Details:
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Languages: eng Pagination: 937-44 Citation Subset: IM |
Affiliation:
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Laboratorio di Fisiologia, Dipartimento di Scienze Mediche, Facoltà di Medicina e Chirurgia, Università del Piemonte Orientale 'A. Avogadro', Novara, Italy. molinari@med.unipmn.it |
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| MeSH Terms | |
Descriptor/Qualifier:
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Adrenergic Antagonists
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pharmacology Anesthesia Animals Blood Pressure / drug effects Cholinergic Antagonists / pharmacology Coronary Circulation / drug effects* Dehydroepiandrosterone / pharmacology* Dose-Response Relationship, Drug Enzyme Inhibitors / pharmacology Female Heart Rate / drug effects Injections, Intravenous Male Muscarinic Antagonists / pharmacology Nitric Oxide Synthase / antagonists & inhibitors Reflex / drug effects Swine Vascular Resistance / drug effects Ventricular Function, Left / drug effects |
| Chemical | |
Reg. No./Substance:
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0/Adrenergic Antagonists; 0/Cholinergic Antagonists; 0/Enzyme Inhibitors; 0/Muscarinic Antagonists; 53-43-0/Dehydroepiandrosterone; EC 1.14.13.39/Nitric Oxide Synthase |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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