Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P17174 (aspartate aminotransferase)
 14,872 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

A radioimmunoassay for quantitation of serum myoglobin in healthy individuals and patients with different diseases is described. Purified myoglobin was labelled by an 125I-labelled ester (N-succinimidyl 3-(-4 hydroxy, 5-[125I]iodophenyl) propionate), a commercially available antiserum was used, and the antigen-antibody complex was precipitated with polyethylene glycol 6000. The rapid assay can be performed within 1 h at 37 degrees C with a detection limit of 45 micrograms/l. Prolonged incubation at 4 degrees C for 18 or 72 h gives a detection limit of 6 and 2 micrograms/l, respectively. The mean coefficient of variation of the routine assay was 11%. In healthy human subjects a significant difference in mean serum myoglobin concentration was found between 43 women (34 +/- 17 micrograms/l) and 51 mean 47 +/- 15 micrograms/l). In twenty patients admitted to hospital with the clinical diagnosis acute myocardial infarction, the serum myoglobin concentration profiles were in close agreement with the final diagnosis. In three patients with myocardial infarction serum samples were taken every 2 h after the acute episode, and serum myoglobin levels were compared with the levels of creatine kinase, lactate dehydrogenase, aspartate aminotransferase and creatine kinase isoenzyme-MB.
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PMID:Rapid and sensitive radioimmunoassays for human myoglobin. 53 83

Myoglobin and the enzymatic activity of creatine phosphokinase CK), MB-isoenzyme of CK (CK-MB), aspartate aminotransferase (GOT), alanine aminotransferase (GPT) and lactic acid dehydrogenase (LDH) were serially determined in 10 patients with acute myocardial infarction. Additionally the same parameters were assessed in 5 patients with angina pectoris for 24 hours after bicycle ergometry. 10 in-patients served as controls. Myoglobin was determined by radioimmunoassay and the other enzyme activities according to the current kinetic methods. Comparison of myoglobin with the enzymatic parameters showed that the myoglobin peak occurs 5.6 hours after the beginning of the sampling period, i.e. 7.3 hours earlier than CK and CK-MB and 11.6 hours earlier than GOT. In analogy to this finding the descending limb of the myoglobin curve was significantly earlier at a level of one third of the peak value, i.e. 8.2 hours earlier than CK-MB, 18.8 hours earlier than CK and 27.3 hours earlier than GOT. No signs of myocardial necrosis in terms of myoglobin or enzymatic activity could be detected after bicycle ergometry. It is concluded that myoglobin is a more sensitive parameter for assessment of the acute phase in patients with myocardial infarction than the usualy enzymatic parameters.
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PMID:[Plasma myoglobin level as a course criterium in patients with acute myocardial infarct]. 53 58

Rhabdomyolysis, secondary to exertion is known to result in myoglobinuria and is occasionally associated with acute renal failure. In this study myoglobinaemia occurred in 25 of 44 runners completing a 99 km marathon. A marked rise in the values of myoglobin, lactate and the enzymes creatine kinase (CPK), aspartate transaminase (AST) and lactic dehydrogenase (LDH) was noted. A linear correlation was demonstrated between the level of serum myoglobin and the serum concentrations of urate, CPK, AST and LDH. Both the myoglobin itself and the increased concentration of urate may contribute to the acute renal failure. The pathophysiology of rhabdomyolysis during exertion is discussed in the context of other causes of myoglobinuria. A classification of rhabdomyolysis and myoglobinuria is suggested.
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PMID:Myoglobinuria, rhabdomyolysis and marathon running. 75 Oct 88

It was demonstrated in experiments on 60 dogs that in hyporeactive myocardial infarction (MI) myoglobin (MG) concentration and the activity of creatine kinase (CK) and aspartate aminotransferase (ASAT) increase at a slower rate and reach maximum values later. In hyperreactive MI the rate of their increase and the time of attainment of maximum values are, respectively, greater and earlier than in normoreactive MI. The connection of MG, CK, and ASAT changes with reactivity allows them to be used in prognosticating MI healing.
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PMID:[Kinetics of myoglobin, creatine kinase and aspartate aminotransferase in uncomplicated and complicated forms of healing of experimental myocardial infarction]. 162 20

The time course of changes in serum proteins and other blood constituents after eccentric exercise of the forearm flexors by six nonweight-trained female subjects (age, 19.7 +/- 1.9 years) was investigated. Eccentric muscle actions are those in which the muscle lengthens as it exerts force, as when a person lowers a weight. Serum levels of creatine kinase, lactate dehydrogenase, aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, gamma-glutamyl transpeptidase, myoglobin, as well as urea nitrogen, uric acid, creatinine, calcium, and phosphorus were examined before and for 6 days after exercise. Creatine kinase increased dramatically (peak value ranged from 6740 to 24,200 U/L) and aspartate aminotransferase, lactate dehydrogenase, alanine aminotransferase, and myoglobin followed the same time course as creatine kinase, but their peak values were lower. These proteins did not increase significantly until 48 hours after exercise and reached peak values 3 to 5 days after exercise. Alkaline phosphatase, gamma-glutamyl transpeptidase, uric acid, urea nitrogen, creatinine, calcium, and phosphorus showed no change. There is either a delay in muscle protein release by damaged muscle fibers, or the proteins are unable to leave the interstitial area for the 24 to 48 hour period after exercise. Because of the long delay, care should be taken when blood protein levels are interpreted in persons who have exercised strenuously (even if only for a short period of intense effort) several days before any diagnostic tests are performed.
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PMID:Time course of serum protein changes after strenuous exercise of the forearm flexors. 174 Jun 32

The clinical significance of the serum enzymes creatine kinase (CK, EC 2.7.3.2), lactate dehydrogenase (LD, EC 1.1.1.27) and aspartate aminotransferase (EC 2.6.1.1), and the isoenzymes CK 1-3 and LD 1-5, in acute myocardial infarction (AMI) is reviewed. Particular attention is given to electrophoretic analysis of the isoenzymes (and the CK isoforms/subforms) following AMI and thrombolytic therapy. Other protein markers for the monitoring of AMI, including myoglobin and muscle contractile proteins, are also discussed and the potential for the detection of new marker proteins using high-resolution two-dimensional electrophoretic methods is demonstrated. Whilst emphasis is placed upon electrophoretic methods the value of complementary immunoassays is acknowledged in order to maintain a balanced perspective.
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PMID:Electrophoresis of serum isoenzymes and proteins following acute myocardial infarction. 193 92

The serum myoglobin (MG) was assayed by the radio-immunological method in 30 patients, all victims of a recent myocardial infarction (MI) and in 30 tests subjects suffering (21 cases) or not (9 cases) from heart diseases, but none from myocardial infarction (MI). The blood samples have been collected on hospital admission of the patient, then every four hours during the first 48 hours and finally, every 12 hours from the 48th to 72nd hour. The normal value is less than 85 micrograms/l. The creatine-kinase (CK), the aspartate aminotransferase (ASAT), the alanine aminotransferase (ALAT) and the lactate dehydrogenase (LDH) were also assayed each time. In MI, there is a significant increase in the serum MG level (731 +/- 323 micrograms/l against 174 +/- 198 micrograms/l in the test subjects; p less than 0.001). The sensitivity of this assay reaches 97%, its specificity 80%, its positive predictive value 83% and its negative predictive value 96%. Starting from the beginning of the characteristic pain of infarction, the MG level exceeds the normal values after 3.3 +/- 1.6 hours, reaches its maximum after 9.3 +/- 3.7 hours and comes back to normal after 38 +/- 8.1 hours. On the other hand, the MG level does not enable any conclusion regarding either the transmural/not transmural nature, or the site, or the acuteness of the MI.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Value of the assay of serum myoglobin in recent myocardial infarction]. 218 59

Administration of testosterone after exercises led to suppression of the hormone production during the anabolic phase within 72-120 hrs of muscles adaptation to physical loading. Content of the androgen receptors was also altered. The supercompensatory phase in content of proteins (myoglobin and aspartate aminotransferase as index) was absent due to an impairing effect of testosterone on muscle adaptation. These data suggest that administration of testosterone could not serve as an adequate model of a body androgenization which was observed in anabolic phase of muscle adaptation to physical exercises.
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PMID:[Androgen regulation of the level of tissue-specific proteins in skeletal muscles during physical exercise]. 238 30

Endomyocardial biopsies were taken from the apex of the left ventricle in 15 patients operated on for aortic valve disease or ischaemic heart disease and from papillary muscles in six patients operated on for mitral valve disease. Activities of cardiac phosphofructokinase (PFK), total lactate dehydrogenase (LD), its isoenzyme LD1, aspartate aminotransferase (ASAT), total creatine kinase (CK), its isoenzyme MB, citrate synthase (CS) and myoglobin content (MYO) were related to the angiographically determined left ventricular function. Activities of total LD, PFK and PFK/CS ratio were lower in patients with decreased, than in those with normal, left ventricular function. Myoglobin content and activities of CS and ASAT were not related to left ventricular function. It is suggested that depressed left ventricular contractility is associated with a decreased glycolytic capacity while the oxidative capacity is mainly unaltered.
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PMID:Key enzymes of myocardial energy metabolism in patients with valvular heart disease: relation to left ventricular function. 297 29

The glycolytic and aerobic oxidative capacity in skeletal muscle was investigated to reveal if the decrease seen in muscle protein synthesis is accompanied by a fall in the enzymatic capacity to oxidize substrates. Six patients undergoing elective abdominal surgery were investigated by percutaneous muscle biopsies taken before surgery and on the first and third postoperative days. Protein synthesis as assessed by the polyribosome concentration was 40% lower on the third day postoperatively than before surgery (p less than 0.01). The glycolytic and oxidative capacity was evaluated by determining the activity of eight key enzymes in the intracellular oxidative metabolism, namely total creatine kinase (CK), the isozymes CK-MB and mitochondrial CK, lactate dehydrogenase, citrate synthase, aspartate aminotransferase, and phosphofructokinase, and also the concentration of myoglobin. None of these parameters were affected in the immediate postoperative period independently of the provision of nutritional support. It was concluded that the decrease in protein synthesis is not accompanied by a concomitant decline in the enzymatic oxidative capacity in skeletal muscle in the period immediately following elective surgery.
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PMID:Enzymatic capacity and protein synthesis in human muscle postoperatively. 314 5


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