title: Human natural killer cells analyzed by B73.1, a monoclonal antibody blocking Fc receptor functions. I. Characterization of the lymphocyte subset reactive with B73.1.
abstract: We describe the production of the monoclonal antibody B73.1, reacting with a subset of human lymphocytes and, in about one-half of the donors, with neutrophilic polymorphonuclear leukocytes. In the peripheral blood from normal adult donors, 14.6 +/- 8.5% of the lymphocytes react with B73.1 antibody. The B73.1(+) lymphocyte subset does not bear markers of typical T or B cells and corresponds to the lymphocyte subset containing antibody-dependent killer (K) and natural killer (NK) cells. We demonstrate that: a) virtually all lymphocytes with K/NK cytotoxic activity are found in the lymphocyte subpopulation bearing the B73.1-defined antigen; b) the B73.1(+) lymphocyte subset bears the combination of antigens known to be present on K/NK cells; and c) there is a positive correlation between the level of cytotoxicity and the actual number of B73.1(+) lymphocytes in individual donors. We also report the distribution of B73.1(+) lymphocytes according to donor age and tissue types. The use of the B73.1 antibody in quantitating the actual number of K/NK cells and in performing functional studies on spontaneous cytotoxicity is discussed.
mesh_terms: D000293:Adolescent; D000328:Adult; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D001667:Binding, Competitive; D001853:Bone Marrow / Q000276:immunology; D001854:Bone Marrow Cells; D002469:Cell Separation; D002648:Child; D002675:Child, Preschool; D003602:Cytotoxicity, Immunologic; D005312:Fetal Blood / Q000166:cytology / Q000276:immunology; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007694:Killer Cells, Natural / Q000276:immunology*; D051379:Mice; D009504:Neutrophils / Q000276:immunology; D011961:Receptors, Fc
chemical_list: D000911:Antibodies, Monoclonal; D011961:Receptors, Fc