[The gamma-glutamyltransferase (GGT) isoenzymes in human serum (author's transl)].

With this report we communicate the results of a method for the fractionation of the isoenzymes of gamma-GT in human serum based on a modified technique of Hetland et al., using cellulosa acetate. With this method we observed the appearance of a complex of four band representing: gamma-GT1 = prealbumin-albumin, gamma-GT3 = alpha 1-globulin, gamma-GT3 = alpha 2-globulin, gamma-GT4 = beta-globulin. It has been noted that the gamma-GT2 is the only fraction which constantly appears. This isoenzyme also corresponds to the form, fisiologically present in serum and is presumably preduced in the cells of the bileduct. In the results we observed the appearance of gamma-GT1 only in the course of processes involving certainly cholestasis. This fraction was once reported by other AA., but it has an unknown origin. It was not possible to correlate the appearance of the fractions gamma-GT3 and gamma-GT4 with any specific pathology alterations even though Hetland et al. have affirmed that the gamma-GT3 band derives from hepatic parenchyma.