title: Mechanism of target cell recognition by natural killer cells: characterization of a novel triggering molecule restricted to CD3- large granular lymphocytes.
abstract: In an attempt to identify a molecule in target recognition by CD3- large granular lymphocytes (LGL), we have generated a rabbit antiidiotypic (anti-ID) serum against a monoclonal antibody (mAb 36) that reacted with the cell membrane of K562. Flow cytometry analysis demonstrated that the anti-ID serum bound selectively to CD3- LGL and that F(ab')2 fragments of the anti-ID serum blocked both target cell binding and lysis by NK cells. Stimulation of CD3- LGL with F(ab')2 fragments resulted in the release of serine esterases and the secretion of interferon gamma. Furthermore, anti-ID F(ab')2 antibodies crosslinked to anti-DNP F(ab')2 mediated directed cytotoxicity of a non-natural killer (NK)-susceptible mouse target (YAC-1) via this surface ligand. These functional reactivities were only removed by adsorption with the specific idiotype. Protein analysis showed that the anti-ID serum immunoprecipitated 80-, 110-, and 150-kD proteins. Using this anti-ID, a partial cDNA was cloned and an antipeptide antiserum was made against the portion of the predicted amino acid sequence that corresponded to a portion of the ID binding region. This antipeptide serum exhibited similar functional and biochemical reactivities to those observed with the anti-ID serum. These data suggest that the cell surface moiety recognized by the anti-ID and anti-p104 is novel and is selectively involved in both recognition and triggering of NK-mediated lytic function.
authors.affiliation: Laboratory of Experimental Immunology, National Cancer Institute, Frederick Cancer Research and Development Center, Maryland 21702.
authors.forename: J L
authors.initials: JL
authors.lastname: Frey
authors.forename: T
authors.initials: T
authors.lastname: Bino
authors.forename: R R
authors.initials: RR
authors.lastname: Kantor
authors.forename: D M
authors.initials: DM
authors.lastname: Segal
authors.forename: S L
authors.initials: SL
authors.lastname: Giardina
authors.forename: J
authors.initials: J
authors.lastname: Roder
authors.forename: S
authors.initials: S
authors.lastname: Anderson
authors.forename: J R
authors.initials: JR
authors.lastname: Ortaldo
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000920:Antibody-Dependent Cell Cytotoxicity; D015703:Antigens, CD / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis*; D017252:CD3 Complex; D019002:CD56 Antigen; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D007130:Immunoglobulin Idiotypes / Q000276:immunology; D007371:Interferon-gamma / Q000378:metabolism; D007694:Killer Cells, Natural / Q000276:immunology*; D011817:Rabbits; D011948:Receptors, Antigen, T-Cell / Q000032:analysis*; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D017252:CD3 Complex; D019002:CD56 Antigen; D007106:Immune Sera; D007130:Immunoglobulin Idiotypes; D011948:Receptors, Antigen, T-Cell; D007371:Interferon-gamma