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Characterization by Monoclonal Antibodies of the Cytotoxic Effector Cells in Human Peripheral Blood Mononuclear Cells Reactive against Anchorage‐Dependent Tumour Cell Lines

The effector cells for spontaneous cytotoxicity against anchorage‐dependent human or mouse tumour cell lines in a 72‐h iododeoxyuridine‐re lease assay by normal human peripheral blood cells (PBMNC) or monocyle‐enriched fractions were analysed by the use of monoclonal antibodies. PBMNC or adherent or elutriated monocyte‐enriched populations of PBMNC were depleted of monoclonal antibody‐reactive cells by complement‐dependent lysis or separated into monoclonal‐antibody‐positive or ‐negative subsets by an indirect rosetting technique followed by Ficoll‐Hypaque density gradient separation. The experimental data indicated that in both PBMNC and monocyte‐enrichcd populations, an appreciable proportion of the effector cells with cytolytic activity against adherent human or mouse tumour target cells were positive with B73.1.1 (an antibody with a high degree of selectivity for natural killer (NK) cells), B43.4.1 (or OKM1) and with OKT1 la (an antibody recognizing the receptors lor sheep erythrocytes), and had the morphology of large granular cells, which have previously been shown to mediate NK activity. These effector cells were mostly negative for BRL 1, BRL.2. B52.1.1, B44.1.1, B13.4.1 and DR antigens, unlike classical monocytes. Some cells which are cytotoxic for the adherent mouse, SV‐40‐transformed kidney tumour line. TU‐5. may bear BS2.I.1 or other monocyte‐like antigens. Taken together, these results indicate that, in monocyte‐enriched populations, both NK cells and monocytes have cytotoxic effector activity against various human and mouse adherent target cell lines.