| Activation of ATP-sensitive potassium channels lowers threshold for ischemic preconditioning in dogs. | |
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MedLine Citation:
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PMID: 7977819 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The purpose of the present study was to determine whether enhanced activation of myocardial ATP-dependent potassium channels (KATP) with a potassium channel opener, bimakalim, can reduce the time necessary to produce the protective effect of ischemic preconditioning and to determine whether this effect is mediated via accelerating the rate of action potential shortening during preconditioning. Barbital-anesthetized dogs were subjected to 60 min of left anterior descending coronary artery (LAD) occlusion followed by 4 h of reperfusion. Ten minutes of preconditioning was found to markedly reduce myocardial infarct size from 30.6 +/- 4.7 to 7.1 +/- 2.6%. Subsequently, it was observed that either 3 min of LAD occlusion or a 3-min intracoronary infusion with 0.3 micrograms/min of bimakalim did not reduce myocardial infarct size. However, intracoronary infusion with bimakalim during the 3-min preconditioning period markedly reduced myocardial infarct size to a similar extent as that of ischemic preconditioning (12.2 +/- 1.9%). In addition, it was observed that bimakalim markedly accelerated the ischemia-induced shortening of the action potential during preconditioning. These results are the first to demonstrate that activation of KATP channels with a potassium channel opener reduces the threshold of time necessary to produce preconditioning in anesthetized dogs. These data also suggest that KATP channel activation may produce this effect by enhancing the rate of ischemic myocardial action potential shortening during preconditioning. |
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Authors:
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Z Yao; G J Gross |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The American journal of physiology Volume: 267 ISSN: 0002-9513 ISO Abbreviation: Am. J. Physiol. Publication Date: 1994 Nov |
Date Detail:
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Created Date: 1994-12-08 Completed Date: 1994-12-08 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0370511 Medline TA: Am J Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: H1888-94 Citation Subset: IM |
Affiliation:
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Department of Pharmacology and Toxicology, Medical College of Wisconsin, Milwaukee 53226. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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drug effects Adenosine Triphosphate / physiology* Animals Benzopyrans / pharmacology* Blood Pressure / drug effects Coronary Circulation / drug effects Coronary Vessels / physiology, physiopathology Dihydropyridines / pharmacology* Dogs Female Heart Rate / drug effects Male Myocardial Infarction / physiopathology* Myocardial Ischemia / physiopathology* Myocardial Reperfusion* Potassium Channels / physiology* Time Factors Vasodilator Agents / pharmacology* |
| Grant Support | |
ID/Acronym/Agency:
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HL-08311/HL/NHLBI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Benzopyrans; 0/Dihydropyridines; 0/Potassium Channels; 0/Vasodilator Agents; 117545-11-6/bimakalim; 56-65-5/Adenosine Triphosphate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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