title: Natural killer cells activated in a human mixed lymphocyte response culture identified by expression of Leu-11 and class II histocompatibility antigens.
abstract: Lymphoid cells with natural killer (NK)-like function, morphology, and antigenic phenotype have been identified in a mixed lymphocyte culture generated by co-culture of human peripheral blood mononuclear cells with an allogeneic human B lymphoblastoid cell line CCRF-SB. The majority of these mixed lymphocyte (MLR)-response activated NK cells express the Leu-11 surface antigen, but do not express certain T cell-associated antigens (Leu-1, Leu-3, and Leu-4) or the mature monocyte specific antigen, Leu-M3. Unlike most freshly isolated Leu-11+ human NK cells, the MLR-activated Leu-11+ cells expressed class II major histocompatibility antigens, DR and DC. Concomitant with expression of class II gene products, the Leu-11+,DR+ NK cells demonstrate enhanced cytotoxicity against the NK-sensitive tumor cell line K562. The presence of mitotic cells in the Leu-11+,DR+ population and the acquisition of increased levels of transferrin receptor on the cell surface were further indicators of activation of these cells. The direct precursors of the MLR-activated Leu-11+,DR+ cell were Leu-11+ cells that lacked expression of another NK-associated antigen Leu-7, i.e., Leu-7-,11+. These studies provided a definitive identification of the "NK-like" cell in MLR cultures and thus allow quantitation and isolation of these cells for further study.
mesh_terms: D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D006680:HLA Antigens / Q000235:genetics / Q000276:immunology*; D006410:Hematopoiesis; D006801:Humans; D007694:Killer Cells, Natural / Q000166:cytology / Q000276:immunology*; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D010641:Phenotype; D013234:Stem Cells / Q000276:immunology
chemical_list: D006680:HLA Antigens