| Acetylcholine-induced vasoconstrictor response of coronary vessels in rats: a possible contribution of M2 muscarinic receptor activation. | |
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MedLine Citation:
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PMID: 9559968 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A mechanism by which acetylcholine (ACh) may elicit vasoconstrictor response in coronary vessels was studied in rat hearts perfused at a constant flow rate. In spontaneously beating hearts, bolus injections of ACh and carbachol (CCh) produced biphasic changes in coronary perfusion pressure (CPP): a transient increase at the initial period followed by a sustained decrease. In KCl-arrested hearts, ACh and CCh produced a monophasic increase in CPP, which was attenuated by either removal of endothelial cells by saponin or cyclooxygenase inhibition by diclofenac sodium. In the spontaneously beating heart, ACh-induced vasoconstriction was almost abolished by atropine (0.1 microM) and was markedly attenuated by an M2 antagonist, methoctramine (0.1 microM), but not by an M1 antagonist, pirenzepine (1 microM). Arecaidine propargyl ester (APE), an M2 agonist, produced coronary artery constriction which was attenuated by methoctramine (0.1 microM) but not by pirenzepine (0.1 microM) in both spontaneously beating and KCl-arrested hearts. McN-A-343, an M1 agonist, increased CPP in both beating and KCl-arrested hearts, but to a lesser degree than APE. These results suggest that the release of vasoconstrictor prostaglandins from endothelial cells contributes to the vasoconstrictor response to ACh in perfused rat coronary vessels, and the response to ACh appears to be mediated, in part, via the M2 subtype of muscarinic receptors. |
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Authors:
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Y Nasa; H Kume; S Takeo |
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Publication Detail:
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Type: In Vitro; Journal Article |
Journal Detail:
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Title: Heart and vessels Volume: 12 ISSN: 0910-8327 ISO Abbreviation: Heart Vessels Publication Date: 1997 |
Date Detail:
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Created Date: 1998-05-27 Completed Date: 1998-05-27 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8511258 Medline TA: Heart Vessels Country: JAPAN |
Other Details:
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Languages: eng Pagination: 179-91 Citation Subset: IM |
Affiliation:
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Department of Pharmacology, Tokyo University of Pharmacy and Life Science, Hachioji, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acetylcholine
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pharmacology* Animals Atropine / pharmacology Coronary Vessels / physiology* Cyclooxygenase Inhibitors / pharmacology Diclofenac / pharmacology Endothelium, Vascular / physiology Male Muscarinic Antagonists / pharmacology Myocardial Contraction / drug effects Rats Rats, Sprague-Dawley Receptors, Muscarinic / physiology* Saponins / pharmacology Vasoconstriction / drug effects*, physiology* |
| Chemical | |
Reg. No./Substance:
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0/Cyclooxygenase Inhibitors; 0/Muscarinic Antagonists; 0/Receptors, Muscarinic; 0/Saponins; 15307-86-5/Diclofenac; 51-55-8/Atropine; 51-84-3/Acetylcholine |
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