Document Detail


Sarcolemmal integrity and metabolic competence of cardiomyocytes under anoxia-reoxygenation.
MedLine Citation:
PMID:  2309898     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In tissue, mechanical cell-to-cell interactions may contribute to cardiomyocyte injury in anoxia-reoxygenation. In the present study, the disturbance of energy metabolism and cell injury were investigated in isolated cardiomyocytes, free of external mechanical constraints. Cardiomyocytes from adult rat, attached to culture dishes, were exposed to 120 min of anoxia and 15 min of reoxygenation in a substrate-free modified Tyrode solution. The energetic state of the cells in anoxia-reoxygenation was characterized by the free-energy change of ATP hydrolysis (delta GATP), amounting to 57 kJ/mol ATP in normoxia. After 120 min of anoxia, all cells were contracted to 65% of their length and delta GATP decreased to 41 kJ/mol. No lactate dehydrogenase was released. Reoxygenation caused a partial oxygen paradox: immediate hypercontracture of the cells, but no release of lactate dehydrogenase. delta GATP recovered to 51 kJ/mol within 15 min. The results demonstrate that anoxic cardiomyocytes can be energy depleted without losing sarcolemmal integrity. They can undergo hypercontracture, elicited by reoxygenation, and yet an almost normal delta GATP can be reestablished.
Authors:
B Siegmund; A Koop; T Klietz; P Schwartz; H M Piper
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The American journal of physiology     Volume:  258     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1990 Feb 
Date Detail:
Created Date:  1990-04-03     Completed Date:  1990-04-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  H285-91     Citation Subset:  IM    
Affiliation:
Physiologisches Institut I, Universität Düsseldorf, Federal Republic of Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Anoxia / metabolism,  pathology*
Cells, Cultured
Energy Metabolism
L-Lactate Dehydrogenase / metabolism
Microscopy, Electron, Scanning
Myocardium / metabolism,  pathology,  ultrastructure*
Oxygen / pharmacology*
Sarcolemma / ultrastructure*
Chemical
Reg. No./Substance:
7782-44-7/Oxygen; EC 1.1.1.27/L-Lactate Dehydrogenase

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


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