Document Detail


The use of microelectrode array (MEA) to study the protective effects of potassium channel openers on metabolically compromised HL-1 cardiomyocytes.
MedLine Citation:
PMID:  19136734     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The microelectrode array (MEA) was used to evaluate the cardioprotective effects of adenosine triphosphate sensitive potassium (K(ATP)) channel activation using potassium channel openers (KCOs) on HL-1 cardiomyocytes subjected to acute chemically induced metabolic inhibition. Beat frequency and extracellular action potential (exAP) amplitude were measured in the presence of metabolic inhibitors (sodium azide (NaN(3)) or 2-deoxyglucose (2-DG)) or KCOs (pinacidil (PIN, a cyanoguanidine derivative, activates sarcolemmal K(ATP) channels) or SDZ PCO400 (SDZ, a benzopyran derivative, activates mitochondrial K(ATP) channels)). The protective effects of these KCOs on metabolically inhibited HL-1 cells were subsequently investigated. Signal shapes indicated that NaN(3) and 2-DG reduced the rate of the sodium (Na(+)) influx signal as reflected by a reduction in beat frequency. PIN and SDZ appeared to reduce both rate of depolarization and extent of the Na(+) influx signals. Pre-treating cardiomyocytes with PIN (0.1 mM), but not SDZ, prevented the reduction of beat frequency associated with NaN(3)- or 2-DG-induced metabolic inhibition. The exAP amplitude was not affected by either KCO. The cardioprotective effect of PIN relative to SDZ may be due to the opening of different K(ATP) channels. This metabolic inhibition model on the MEA may provide a stable platform for the study of cardiac pathophysiology in the future.
Authors:
J K Y Law; C K Yeung; B Hofmann; S Ingebrandt; J A Rudd; A Offenhäusser; M Chan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-01-09
Journal Detail:
Title:  Physiological measurement     Volume:  30     ISSN:  0967-3334     ISO Abbreviation:  Physiol Meas     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2009-01-30     Completed Date:  2009-04-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306921     Medline TA:  Physiol Meas     Country:  England    
Other Details:
Languages:  eng     Pagination:  155-67     Citation Subset:  IM    
Affiliation:
Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology (HKUST), Hong Kong.
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MeSH Terms
Descriptor/Qualifier:
Action Potentials / drug effects,  physiology
Animals
Benzopyrans / pharmacology*
Cell Hypoxia / drug effects,  physiology
Cell Line
Cyclopentanes / pharmacology*
Deoxyglucose / pharmacology
Energy Metabolism / drug effects,  physiology
Enzyme Inhibitors / pharmacology
Membrane Transport Modulators / pharmacology
Mice
Microelectrodes*
Myocytes, Cardiac / cytology,  drug effects*,  physiology*
Pinacidil / pharmacology
Potassium Channels / physiology*
Chemical
Reg. No./Substance:
0/Benzopyrans; 0/Cyclopentanes; 0/Enzyme Inhibitors; 0/Membrane Transport Modulators; 0/Potassium Channels; 0/mitochondrial K(ATP) channel; 121055-10-5/SDZ PCO 400; 154-17-6/Deoxyglucose; 85371-64-8/Pinacidil

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


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