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Clinical Chemistry 31: 569-573, 1985;
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Clinical Chemistry, Vol 31, 569-573, Copyright © 1985 by American Association for Clinical Chemistry

Multiple forms of gamma-glutamyltransferase: a clinical study

PR Wenham, DB Horn and AF Smith

We have measured the amounts of different molecular forms of gamma- glutamyltransferase (EC 2.3.2.2), leucine aminopeptidase (EC 3.4.11.2), and alkaline phosphatase (EC 3.1.3.1) in serum of patients with different types of liver disease. A high-molecular-mass (greater than 1 000 000 Da) form of gamma-glutamyltransferase and of each of the other enzymes is present in greatest amounts in patients with jaundice from extrahepatic obstruction. A gamma-glutamyltransferase form of intermediate molecular mass (250 000 to 500 000 Da) is present in the serum from most patients with liver disease and can be separated by electrophoresis into several bands. We found that one of these bands predominated in patients with extrahepatic obstructive jaundice, whereas the others predominated in patients with other liver diseases. Electrophoresis of serum gamma-glutamyltransferase may be of clinical value in distinguishing extrahepatic from intrahepatic causes of jaundice.




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