Atrial and ventricular myosin ATPase--divergence with increasing animal species size

Myosin was isolated from mouse, rat, rabbit, pig and bovine atrial and ventricular myocardium and Ca2+-ATPase activity was examined. In the mouse the ATPase activity of myosin was the same in atrial and ventricular myocardium. In larger animal species, the activity of atrial myosin ATPase was higher...

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Bibliographic Details
Published inPflügers Archiv Vol. 404; no. 1; p. 80
Main Author Syrový, I
Format Journal Article
LanguageEnglish
Published Germany 01.05.1985
Subjects
Adenosine Triphosphatases - metabolism
Animals
Body Weight
Cattle
Female
Heart Atria
Heart Ventricles
Mice
Myocardial Contraction
Myocardium - enzymology
Rabbits
Rats
Species Specificity
Swine
Tissue Distribution
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Summary:Myosin was isolated from mouse, rat, rabbit, pig and bovine atrial and ventricular myocardium and Ca2+-ATPase activity was examined. In the mouse the ATPase activity of myosin was the same in atrial and ventricular myocardium. In larger animal species, the activity of atrial myosin ATPase was higher than that of ventricular myocardium and the larger the animal species the greater the divergence between the activities of atrial and ventricular myosin ATPase. The relevance of these observations to regulation of heart contractility is discussed.
ISSN:0031-6768
DOI:10.1007/BF00581495