title: Monoclonal antibody recognizing a unique Rh-related specificity.
abstract: A mouse IgG1 monoclonal antibody (MAb) UMRh, was prepared by immunizing Balb/c mice with the Jurkat T cell acute lymphoblastic leukemia (T-ALL) cell line. The MAb UMRh is directed against a widely distributed Rh-related cell surface antigen, present on red blood cells (RBCs) expressing the more common Rh phenotypes. The antigen has reduced expression on RBCs of -D-, DCW-/DCW-, Rhmod and Rhnull phenotypes. UMR immunoblotted a unique pattern on RBC membrane preparations of two bands at 40 and 43 kD and a diffuse pattern extending upward to about 55 kD. The UMRh antigen is also present on peripheral blood mononuclear cells, granulocytes, platelets, leukemic cells of T cell, B cell and myeloid origins, hematopoietic stem cells, and two tumor lines (lung and colon carcinoma). The number of UMRh sites per RBC (CDe/ce) was determined to be 5,519 copies/cell, whereas the sites on a -D- phenotype RBC were 1,096 copies/cell. A T-ALL line (CEM) expressed 333,364 copies/cell and a myeloid line (KG-1) expressed 90,913 copies/cell. Several Rh-related murine MAbs have been described, but our data indicates that UMRh recognizes a previously uncharacterized Rh-related specificity.
authors.affiliation: Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis.
authors.forename: M T
authors.initials: MT
authors.lastname: Poss
authors.forename: J L
authors.initials: JL
authors.lastname: Swanson
authors.forename: M J
authors.initials: MJ
authors.lastname: Telen
authors.forename: L C
authors.initials: LC
authors.lastname: Lasky
authors.forename: D A
authors.initials: DA
authors.lastname: Vallera
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D000939:Epitopes / Q000276:immunology; D005434:Flow Cytometry; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000276:immunology / Q000473:pathology; D051379:Mice; D008807:Mice, Inbred BALB C / Q000276:immunology; D012204:Rh-Hr Blood-Group System / Q000276:immunology*; D012699:Serology; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D007074:Immunoglobulin G; D012204:Rh-Hr Blood-Group System