title: Characterization of four new monoclonal antibodies that recognize mouse natural killer activation receptors.
abstract: With the aim of identifying natural killer (NK) activation receptors, we immunized BALB/c mice with (BALB/cxB6)F1 NK LAK cells and made B-cell hybridomas. These were screened for monoclonal antibody (MAb) reacting with an NK activation receptor by using an antibody-induced redirected lysis (AIRL) assay against FcR-bearing P815 targets. Four hybridomas, clones 1C10, 1F10, 2D10 and 4G4, were selected for further characterization. Protein G-purified MAbs from these clones activated both resting and IL-2 activated B6 or F1 NK cells in the AIRL assay. 1F10 MAb, but not the other three MAbs, could compete for the binding of anti-NK1.1 (PK136) MAb to F1 NK cells. The four MAbs were screened for their ability to bind to or activate NK cells from the mouse strains SJL/J, DBA/2, 129/J, C3H/J, and BALB.K. None showed activity except IC10, which could bind to and activate SJL/J NK cells. When members of the NKR-P1 family from both B6 mice (A, B, and C genes expressed) and SJL mice (only A and B genes expressed) were expressed in Jurkat cells and tested for their antibody reactivity, PK136 MAb was found to recognize B6 NKR-P1C and SJL/J NKR-P1B; IC10 MAb was found to recognize NKR-P1-A, -B and -C from B6, but not NKR-P1A or -B from SJL/J; and 1F10 MAb was found to react only with B6 NKR-P1C.
authors.affiliation: Department of Medical Biophysics, Ontario Cancer Institute, University of Toronto, Canada.
authors.forename: S K
authors.initials: SK
authors.lastname: Kung
authors.forename: R C
authors.initials: RC
authors.lastname: Su
authors.forename: J
authors.initials: J
authors.lastname: Shannon
authors.forename: R G
authors.initials: RG
authors.lastname: Miller
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis / Q000276:immunology* / Q000302:isolation & purification / Q000494:pharmacology; D000918:Antibody Specificity; D000950:Antigens, Ly; D000954:Antigens, Surface / Q000276:immunology; D001667:Binding, Competitive; D003429:Cross Reactions; D005434:Flow Cytometry; D006825:Hybridomas; D015979:Killer Cells, Lymphokine-Activated / Q000737:chemistry / Q000187:drug effects / Q000276:immunology; D007694:Killer Cells, Natural / Q000737:chemistry / Q000187:drug effects / Q000276:immunology*; D037181:Lectins, C-Type; D008213:Lymphocyte Activation / Q000187:drug effects; D051379:Mice; D055651:NK Cell Lectin-Like Receptor Subfamily B; D011971:Receptors, Immunologic / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000950:Antigens, Ly; D000954:Antigens, Surface; C527211:Klrb1c protein, mouse; D037181:Lectins, C-Type; D055651:NK Cell Lectin-Like Receptor Subfamily B; D011971:Receptors, Immunologic