EVIDENCE FOR ANTIBODY-DEPENDENT CELL-MEDIATED CYTOTOXICITY BY T-CELLS BEARING RECEPTORS FOR IGG

Abstract

Human lymphocyte populations comprising T [thymus-derived] cells, T depleted lymphocytes, and T cells enriched for, or depleted of, Ig[immunoglobulin]G Fc receptor-bearing (TG) cells, were separated using rosette techniques. All lymphocytes were assessed for the ability to lyse antibody-coated chicken erythrocytes and SL2 mouse lymphoma cells. Their activity was compared with that of monocytes and neutrophil-enriched preparations. IgG Fc receptor positive cells within the T population were highly active in both cytotoxicity assays; the activity could not be ascribed to contamination by monocytes or neutrophils. The TG cells forming junctions with the target cells possessed a characteristic ultrastructure.