Investigations on the activity of gamma-glutamyltranspeptidase (GGT) and dipeptidyl peptidase IV (DPP IV) in the serum of healthy chickens and those bearing hepatoma Mc-29, and in liver and hepatoma plasma membranes were carried out. There was no difference in the serum enzyme activities of control and tumor-bearing chickens but the activity of GGT was twice higher and that of DPP IV 20 times lower in hepatoma plasma membranes than in chicken liver plasma membranes. Using thin-layer analytical isoelectric focusing in agarose gels it was established that the pI range of GGT from host serum and hepatoma plasma membranes was shifted to more acidic values. This could be interpreted as a specific feature for this enzyme considered as a tumor marker.
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