Abstract

Foetal erythropoiesis is characterized by many properties of the erythrocytes the best known of which is the presence of haemoglobin F in the erythrocytes. A distinct pattern of hexokinase isoenzymes is a further typical sign of foetal erythrocytes. We have investigated the hexokinase isoenzymes of 4 children (age: 2, 8, 9, and 11 years) with acute myeloid and juvenile chronic myeloid leukaemia, erythroleukaemia and aplastic anaemia whose erythrocytes exhibited in - creased haemoglobin F-concenttrations (8, 65, 53, and 10 %). Their hexokinase isoenzymes were partially purified by treatment with DEAE-Sephadex and separated by analytical isoelectric focussing in polyacrylamide gels. The foetal type of hexokinase isoenzymes was observed in the erythrocytes of all patients. This suggets that the synthesis of haemoglobin F and of the hexokinase isoenzymes are under common control as well in malignancies as in non-malignant disease.

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