title: Inhibition of autologous mixed lymphocyte reaction by aggregated IgG molecules.
abstract: Human autologous and allogeneic mixed lymphocyte reactions (MLR) were studied using various T cell subsets as responding cells. T cells expressing Fc gamma receptor for IgG (TG) were weak responder while T cells with Fc mu receptor and T cells lacking Fc receptor responded vigorously in both types of MLR. Percoll-separated T cells of low density (TL) enriched for TG cells were, however, excellent responders in autologous MLR, whereas T cells of high density (TH) were the major responders in allogeneic MLR. Continuous presence of or short-term pulse with aggregated IgG significantly reduced the autologous MLR of unfractionated T and TL cells while largely sparing proliferation in allogenic MLR. These findings are discussed with respect to diminished autologous MLR reactivity in certain autoimmune diseases.
mesh_terms: D001327:Autoimmune Diseases / Q000276:immunology; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology*; D007959:Lymphocyte Culture Test, Mixed; D011961:Receptors, Fc / Q000276:immunology*; D012397:Rosette Formation; D013601:T-Lymphocytes / Q000145:classification / Q000276:immunology*
chemical_list: D007074:Immunoglobulin G; D011961:Receptors, Fc