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Inhibition of Natural Killer Cell Activity by Antigen-Antibody Complexes
Authors:B. K. Pedersen    B. S. Thomsen   H. Nielsen
Affiliation:Laboratory of Medical Immunology TA, Rigshospital, Copenhagen, Denmark
Abstract:The natural killer (NK) cell activity of human peripheral blood mononuclear cells was found to be inhibited by precipitated tetanus toxoid anti-tetanus toxoid complexes (Te/aTe) as well as soluble Te/aTe. Preincubation of the immune complexes with protein A decreased the inhibition of NK cell activity. When mononuclear cells were preincubated with interferon (IF) or interleukin 2 (Il-2) before incubation with Te/aTe, the immune complex-induced inhibition was decreased, while IF or Il-2 added after incubation with the immune complexes had no effect. Using NK cell-enriched suspensions in a single cell agarose assay, the immune complexes were shown to inhibit NK cell activity by inhibiting the formation of effector/target cell conjugates.
Keywords:Fc-receptor    immune complexes    natural killer cells
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