Different activities of energy metabolism enzymes in children's cardiac atria and ventricles.
Tissue samples from the right atrium and ventricle of the same heart were obtained during surgery on 45 children operated on for congenital heart disease (tetralogy of Fallot, ventricular septal defect). Significant enzyme activity differences were found between atrial and ventricular muscle. Aerobic metabolism enzymes (citrate synthase, malate dehydrogenase), with lactate metabolism (lactate dehydrogenase) and fatty acid oxidation (hydroxyacyl-SoA dehydrogenase) showed significantly higher activities in ventricular muscle tissue. In contrast, hexokinase, the enzyme responsible for glucose phosphorylation was significantly higher in the atria. Hence, the right ventricle can utilize and oxidize to the full all the main nutrients (fatty acids, glucose and lactate) while the right atrium utilizes primarily glucose. These atrio-ventricular differences are independent of the type of congenital heart disease and their existence can be presumed in healthy persons, too.
Bass
A
A
Heart Centre, Prague-Motol Teaching Hospital.
Samánek
M
M
Ostádal
B
B
Hucín
B
B
Stejsklová
M
M
D015094:3-Hydroxyacyl CoA Dehydrogenases / Q000378:metabolism; D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002950:Citrate (si)-Synthase / Q000378:metabolism; D004734:Energy Metabolism; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000378:metabolism; D050536:Glycerol-3-Phosphate Dehydrogenase (NAD+); D005993:Glycerolphosphate Dehydrogenase / Q000378:metabolism; D006325:Heart Atria / Q000201:enzymology / Q000378:metabolism; D006345:Heart Septal Defects, Ventricular / Q000201:enzymology / Q000378:metabolism; D006352:Heart Ventricles / Q000201:enzymology / Q000378:metabolism; D006593:Hexokinase / Q000378:metabolism; D006801:Humans; D007223:Infant; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008291:Malate Dehydrogenase / Q000378:metabolism; D009206:Myocardium / Q000201:enzymology* / Q000378:metabolism; D013771:Tetralogy of Fallot / Q000201:enzymology / Q000378:metabolism
D005993:Glycerolphosphate Dehydrogenase; D015094:3-Hydroxyacyl CoA Dehydrogenases; D007770:L-Lactate Dehydrogenase; D008291:Malate Dehydrogenase; D050536:Glycerol-3-Phosphate Dehydrogenase (NAD+); D005987:Glyceraldehyde-3-Phosphate Dehydrogenases; D002950:Citrate (si)-Synthase; D006593:Hexokinase