Document Detail


Myocardial ATP synthesis and mechanical function following oxygen deficiency.
MedLine Citation:
PMID:  645929     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The relationship between oxygen deficiency-reduced high energy phosphate levels and their resynthesis upon return to aerobic conditions was investigated in the isolated perfused rat heart. Any net adenosine triphosphate (ATP) hydrolysis during anoxia tended to impair ATP resynthesis with subsequent aerobic perfusion. Thirty minutes of ischemia reduced myocardial ATP 50%, and with restoration of aerobic conditions ATP increased to only 60% of control levels. The major source of postischemic and postanoxic ATP was adenosine 5'-monophosphate and adenosine 5'-disphosphate. Loss of purine base from oxygen-deficient cells limited restoration of ATP. The inclusion of adenosine, ATP, or creatine phosphate (CP) in the perfusate did not enhance postischemic tissue adenine-nucleotide concentrations. Postischemic and postanoxic CP concentrations returned to control values and were independent of ischemic and anoxic ATP and CP concentrations. Complete resynthesis of CP suggests that cellular energy-producing pathways were functional. Ventricular performance was directly related to tissue ATP concentration in aerobic control, postischemic, and postanoxic hearts. Thus, loss of adenine nucleotides during oxygen deficiency may impair subsequent aerobic synthesis of ATP and mechanical function.
Authors:
D K Reibel; M J Rovetto
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  234     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1978 May 
Date Detail:
Created Date:  1978-06-28     Completed Date:  1978-06-28     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:  H620-4     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Adenosine / metabolism
Adenosine Triphosphate / biosynthesis*
Animals
Coronary Disease / metabolism,  physiopathology*
Creatine / metabolism
Male
Myocardial Contraction*
Myocardium / metabolism*
Rats
Time Factors
Chemical
Reg. No./Substance:
56-65-5/Adenosine Triphosphate; 57-00-1/Creatine; 58-61-7/Adenosine

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


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