Distribution of the 124-kd antigen defined by monoclonal antibody AML-1-99 on normal and leukemic myeloid cells.
We have produced a monoclonal antibody (MoAb), AML-1-99, that defines a novel 124-kd protein antigen expressed on a subpopulation of monocytes and on the majority of hematopoietic progenitor cells of the granulocyte-monocyte (CFU-GM), erythroid, and mixed-lineage classes. AML-1-99 is lytic to bone marrow (BM)- and peripheral blood-derived progenitor cells in the presence of rabbit complement (C'). AML-1-99 is not toxic to progenitor cells in the absence of C', nor does it modify their growth when included in colony-forming cultures. Several leukemia cell lines, including HL-60, U937, KG-1a, and Daudi cells, express the antigen on the majority of cells. Freshly isolated leukemia cells from patients with acute myelogenous leukemia (AML) react variably with AML-1-99. Leukemia colony-forming cells from several AML patients express the antigen and could be eliminated by treatment with AML-1-99 and C'. Cell sorting and immune rosette techniques were successfully applied to normal BM and chronic myelocytic leukemia cell populations using AML-1-99 with the result that significant enrichment of CFU-GM could be accomplished. The pattern of reactivity of this MoAb and its apparent molecular weight suggests that AML-1-99 recognizes a newly defined myeloid-associated cell surface antigen.
Department of Medicine, Dartmouth Medical School, Hanover, New Hampshire 03756.
A L
AL
Howell
R
R
Miller
K A
KA
Keefe
O R
OR
McIntyre
M
M
Stockner
R
R
Sullivan
S R
SR
Hibbert
R J
RJ
Noelle
E D
ED
Ball
D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation / Q000032:analysis*; D001853:Bone Marrow / Q000276:immunology; D001854:Bone Marrow Cells; D002469:Cell Separation; D002478:Cells, Cultured; D003165:Complement System Proteins / Q000494:pharmacology; D005434:Flow Cytometry; D006412:Hematopoietic Stem Cells / Q000276:immunology; D006801:Humans; D007951:Leukemia, Myeloid / Q000276:immunology / Q000473:pathology*; D015470:Leukemia, Myeloid, Acute / Q000276:immunology; D012397:Rosette Formation; D013234:Stem Cells; D013997:Time Factors; D014407:Tumor Cells, Cultured; D014410:Tumor Stem Cell Assay
D000911:Antibodies, Monoclonal; D000943:Antigens, Differentiation; D003165:Complement System Proteins