Serial changes in cytosolic, mitochondrial, and lysosomal enzymes and cardiac myosin light chain II in plasma following coronary ligation in conscious closed-chest dogs.
We studied serial changes in various myocardial enzymes and cardiac myosin light chain II (LCII) in plasma following coronary ligation in 14 conscious closed-chest dogs. Cytoplasmic enzymes [creatine phosphokinase (CPK) and supernatant glutamic oxaloacetic transaminase (sGOT)] reached maximum at 12-24 hr and returned to normal at 72-96 hr. The mitochondrial isozyme of GOT (mGOT) began to rise at 6-9 hr, peaked at 12-30 hr (4.8-42.2 IU/liter), and stayed higher at 96 hr than before infarction. Glutamate dehydrogenase (GLDH), another mitochondrial enzyme, began to elevate at 6-16 hr and reached maximum at 24-60 hr (6.2-20.5 U/liter); GLDH also showed higher levels at 96 hr than before infarction. N-Acetyl-beta-glucosaminidase (NAG), a lysosomal enzyme, showed a biphasic pattern in every case. The first peak appeared at 3-12 hr, and the second one at 36-72 hr. Myosin LCII began to rise at 3-9 hr, peaked at 30-120 hr (34-136 ng/ml), and remained elevated for 7 to 10 days. Determination of these myocardial enzymes or LCII in plasma is useful for the diagnosis of acute myocardial infarction.
D000118:Acetylglucosaminidase / Q000097:blood; D000818:Animals; D001219:Aspartate Aminotransferases / Q000097:blood; D003402:Creatine Kinase / Q000097:blood; D004285:Dogs; D005969:Glutamate Dehydrogenase / Q000097:blood; D008929:Mitochondria, Heart / Q000201:enzymology; D009203:Myocardial Infarction / Q000201:enzymology*; D009206:Myocardium / Q000201:enzymology*; D009218:Myosins / Q000097:blood
D005969:Glutamate Dehydrogenase; D001219:Aspartate Aminotransferases; D003402:Creatine Kinase; D000118:Acetylglucosaminidase; D009218:Myosins