Immunoreactivity of anti K562 monoclonal antibodies with leukemic cells of myeloid lineage.
Three monoclonal antibodies (MAb) raised against K562 cells (erythroleukemic cell line) reacting specifically with myeloid maturation related antigens, were characterized. MAb 4.3 (IgG2bk) reacted with promyelocytes, metamyelocytes and myelocytes, MAb 4.6 (IgG3k) also identified the myeloid blasts, while MAb 4.8 (IgG1k) reacted with metamyelocytes. The affinity constant of the MAbs ranged from 0.8 X 10(7) -3.9 X 10(8) M-1 and the binding sites on K562 cells varied from 8 X 10(4)-4 X 10(5). In competition RIA MAbs 4.6 and 4.8 competed with each other for binding sites on K562 cells. In Western blot analysis the MAbs reacted with 66,000 mol.wt and 84,000 mol.wt peptides on K562 cells and 97,000 mol.wt peptide on chronic myeloid leukemia (CML) cells. These MAbs may help in immunophenotyping of myeloid leukemias.
Cancer Research Institute, Tata Memorial Hospital, Bombay, India.
S V
SV
Chiplunkar
H S
HS
Maniar
R J
RJ
Tatake
K M
KM
Amin
S H
SH
Advani
S G
SG
Gangal
D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000276:immunology*; D000937:Antigen-Antibody Reactions; D000951:Antigens, Neoplasm / Q000032:analysis / Q000276:immunology; D001666:Binding Sites, Antibody; D001667:Binding, Competitive; D015153:Blotting, Western; D003429:Cross Reactions; D000939:Epitopes / Q000032:analysis / Q000276:immunology; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D004915:Leukemia, Erythroblastic, Acute / Q000276:immunology*; D007951:Leukemia, Myeloid / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight
D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000939:Epitopes