title: Terminal deoxynucleotidyl transferase activity and cell surface antigens of two unique cell lines (NALM-1 and BALM-2) of human leukemic origin.
abstract: Two unique cell lines, NALM-1 and BALM-2 derived from lymphoblast-like cells of chronic myelogenous leukemia and rare B cell acute lymphoblastic leukemia patients, respectively, were compared with fresh parent cells from the patients and with a Philadelphia chromosome positive K-562 cell line previously established from a chronic myelogenous leukemia patient in blastic phase. NALM-1 resembled the parent cells in the presence of Philadelphia chromosome, non-T/non-B acute lymphoblastic leukemia specific antigens and lack of T or B cell markers, whereas BALB-2, like the parent cells, had two chromosome markers and bore kappa, delta and mu immunoglobulins. NALM-1 lacked Epstein-Barr virus genome, whereas BALM-2 showed the presence of Epstein-Barr virus genome. K-562 cells lacked all the antigen markers examined. All cells had high DNA polymerase alpha activity and low DNA polymerase gamma activity. NALM-1, like the parent cells and unlike K-562 cells, had high terminal deoxynucleotidyl transferase activity of about 200 mu/mg DNA, whereas BALM-2, like its parent cells, had terminal deoxynucleotidyl transferase activity of 1-2 mu/mg DNA (1 u = 1 nmole Mn++-dGTP/h on dA12-18 initiator). Terminal deoxynucleotidyl transferase was characterized by its chromatographic and sedimentation behavior, thermal sensitivity and specific inhibition by streptolydigin and terminal deoxynucleotidyl transferase antisera. These results indicate that NALM-1 and K-562 may represent different phenotypes of cells in CML blastic crisis. Moreover, NALM-1 and BALM-2 seem to have retained the characteristics of original leukemic cells from which they may have been derived.
mesh_terms: D000951:Antigens, Neoplasm / Q000032:analysis; D000956:Antigens, Viral / Q000032:analysis; D002460:Cell Line; D002462:Cell Membrane / Q000276:immunology; D002675:Child, Preschool; D004254:DNA Nucleotidyltransferases / Q000378:metabolism*; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism; D000939:Epitopes; D005260:Female; D004854:Herpesvirus 4, Human / Q000276:immunology; D006801:Humans; D007945:Leukemia, Lymphoid / Q000201:enzymology / Q000276:immunology; D007962:Leukocytes / Q000201:enzymology / Q000276:immunology
chemical_list: D000951:Antigens, Neoplasm; D000956:Antigens, Viral; D000939:Epitopes; D004254:DNA Nucleotidyltransferases; D004259:DNA-Directed DNA Polymerase