Subpopulations of human T lymphocytes. VI. Analysis of cell markers in acute lymphoblastic leukemia with special reference to Fc receptor expression on E-rosette-forming blasts.
A variety of surface markers, terminal deoxynucleotidyl transferase (TdT) activity, morphologic appearance, and cytochemical composition were studied in a group of 16 patients (13 children, 3 adults) with acute lymphoblastic leukemia (ALL). In 9 children, no surface markers were detected on lymphoblasts (null-type ALL). Leukemic blasts of 4 children formed E-rosettes. These E-rosette-forming blasts from 3 adult patients with ALL, were studied for the presence of Fc receptors. Of the leukemic blasts from these 7 patients, 2--76% expressed receptors for IgG Fc. Only 3 of 7 patients showed 9--42% receptors for IgM Fc. In addition, complement receptors were investigated in 6 of those 7 patients with T-cell ALL. Complement receptors were detected on 9--70% of the E rosette forming blasts from all 6 patients. TdT activity was elevated in T-cell ALL and in children with null-type ALL. The heterogeneity of Fc receptor expression on leukemic blasts in these patients demonstrates a malignant proliferation of T cells in different stages of differentiation or maturation. This observation might be helpful in subclassifying T-cell leukemias with regard to prognosis and the response to therapy.
D000328:Adult; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology*; D008297:Male; D011379:Prognosis; D011951:Receptors, Complement / Q000032:analysis; D011961:Receptors, Fc / Q000032:analysis*; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000032:analysis / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory
D011951:Receptors, Complement; D011961:Receptors, Fc