title: A monoclonal antibody reactive with a subset of human plasma cells.
abstract: A mouse monoclonal antibody (R1-3) raised against a human plasmacytoma xenograft and reactive with human plasma cells is described. The antibody reacts with a subset of plasma cells and lymphocytes, but is nonreactive with granulocytes, normoblasts, thymus, spleen or T lymphocytes. Flow cytometer double labelling experiments showed that approximately 50% of R1-3 positive bone marrow cells expressed surface immunoglobulin, but no R1-3 positive cells also expressed B1 or Leu 4. In a myeloma patient the R1-3 reactive cells were found to have a higher rate of DNA proliferation and were aneuploid as determined by flow cytometry. The R1-3 antigen is expressed on late B lymphocytes and early plasma cells.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000951:Antigens, Neoplasm / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D001853:Bone Marrow / Q000276:immunology; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D007124:Immunoenzyme Techniques; D051379:Mice; D008807:Mice, Inbred BALB C; D009101:Multiple Myeloma / Q000276:immunology; D010950:Plasma Cells / Q000145:classification / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000954:Antigens, Surface