title: Monoclonal antibody DLC-48: an effective reagent for use in the depletion of malignant lymphoma from human bone marrow.
abstract: A combination of large-cell lymphoma cell lines was used as immunogen in the production of DLC-48, a mouse monoclonal antibody (MAb) to a B-cell-associated antigen. This reagent identifies a protein found on a majority of peripheral blood B-cells, B-cell derived tumor cell lines, and lymphoma biopsy specimens. In reactive lymph-node sections, DLC-48 stains both germinal center and mantle zone B-lymphocytes when the immunoperoxidase technique is used. DLC-48 is an IgM, and is highly cytotoxic in the presence of human serum complement. The conditions for complement-mediated cytotoxicity were first optimized by utilizing the chromium-release assay with 2 large-cell lymphoma cell lines, and were then applied to the treatment of the cell lines prior to cloning in agar. A single treatment with antibody and human serum eliminated 4 orders of magnitude of target cells. The cytolytic activity of this antibody was not inhibited by the presence of a 20-fold excess of normal human bone marrow. Treatment with antibody and autologous serum did not affect the growth of human hematopoietic progenitor cells (CFU-GEMM and CFU-GM). These results suggest that DLC-48, either alone or in combination with other MAb reagents, should be effective in eliminating malignant cells of B-lineage from human bone marrow for purposes of autologous bone-marrow transplantation.
authors.forename: J N
authors.initials: JN
authors.lastname: Winter
authors.forename: R J
authors.initials: RJ
authors.lastname: Marder
authors.forename: J A
authors.initials: JA
authors.lastname: Radosevich
authors.forename: A L
authors.initials: AL
authors.lastname: Epstein
mesh_terms: D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000276:immunology*; D000954:Antigens, Surface / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology*; D001853:Bone Marrow / Q000276:immunology* / Q000473:pathology; D016026:Bone Marrow Transplantation; D003165:Complement System Proteins / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D005455:Fluorescent Antibody Technique; D006412:Hematopoietic Stem Cells; D006801:Humans; D007124:Immunoenzyme Techniques; D008223:Lymphoma / Q000276:immunology* / Q000628:therapy; D014410:Tumor Stem Cell Assay
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D003165:Complement System Proteins