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Clinical Chemistry, Vol 19, 447-452, Copyright © 1973 by the American Association for Clinical Chemistry
1 From the I° Clinica Medica Generale e Terapia Medica della
Università di Catania, Ospedale Garibaldi, 95123 Catania, Italy.
Serum enzymes that show changed activities in diabetes mellitus can be divided into four groups: Group
I includes some lysosomal enzymes
-glucuronidase N-acetyl-
-glucosaminidase, acid phosphatase,
and amylasethat show increased activity correlated with blood sugar concentration. Because lysosomal enzymes as well as liver amylase show latency
and may be "activated" by several agents, their
increased activity in the serum of diabetics might
be a manifestation of an activation occurring in
tissues. Group II includes alkaline phosphatase and
trehalase, which are increased but not correlated
with blood sugar concentration. Their enhanced activity may reflect tissue metabolic disorders. Group
III includes enzymes that increase in the postketotic
period almost regularlyphosphohexose isomerase
or in only the most severe casesaminotransferases and several dehydrogenasesbecause of tissue damage caused by metabolic and circulatory alterations. Cholinesterase, on the other hand, is decreased. Group IV includes any of the above-mentioned enzymes, and still others, that may be more
active in diabetics with complications such as hepatic and renal involvement and obesity.
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