Altered adenosine triphosphatase activities in pigs with naturally occurring hypertrophic cardiomyopathy |
| |
| Authors: | K-S Dai C-S Liang Y T Ch'iu P-C Yang I C Cheng |
| |
| Institution: | (1) Department of Comparative Medicine, Pig Research Institute Taiwan, PO Box 23, Chunan, Miaoli, Taiwan, R.O.C.;(2) Department of Pathobiology, Pig Research Institute Taiwan, PO Box 23, Chunan, Miaoli, Taiwan, R.O.C.;(3) The Cardiology Unit, Department of Medicine, University of Rochester Medical Center, Rochester, NY, USA |
| |
| Abstract: | The purpose of this study was to determine whether myocardial adenosine triphosphatase (ATPase) activities were reduced in pigs with naturally occurring hypertrophic cardiomyopathy (HCM). The selection of hearts for the HCM and the normal control groups depended on histological examination. Specific ATPase activity and 5 -nucleotidase activity were measured in left ventricular myocardium obtained from HCM (n=7) and normal control (n=7) animals. The histological features of HCM included marked disorientation of muscle cells, thickening of the intramural coronary arterial wall with a narrowed lumen, endocardial fibrosis and myocardial fibrosis. The HCM group showed significant increases in both heart weight (32%) and heart weight to body weight ratio (46%). The total ATPase activity in crude homogenates from the HCM group was significantly decreased by 16%. Azide-sensitive ATPase (mitochondrial ATPase) activity, ouabain-sensitive ATPase (Na+,K+-ATPase) activity, basal Mg2+-ATPase activity and Ca2+-ATPase activity were all significantly decreased by 18%, 30%, 20% and 50%, respectively. In contrast, no significant decrease was found in the mean values for 5-nucleotidase activity. These results suggest that myocardial ATPase activities are suppressed in pigs with naturally occurring HCMAbbreviations ATP
adenosine triphosphate
- gww
grams wet weight
- HCM
hypertrophic cardiomyopathy
- Pi
inorganic phosphate |
| |
| Keywords: | adenosine triphosphatase hypertrophic cardiomyopathy heart pig |
| 本文献已被 SpringerLink 等数据库收录！ |
|
