title: The Fc receptor on thymus-derived lymphocytes. IV. Inhibition of binding of antigen-antibody complexes to Fc receptor-positive T cells by anti-Ia sera.
abstract: Treatment of splenic T lymphocytes with anti-Ia antiserum inhibits the binding of antigen-antibody (AgAb) complexes to the majority (less than 50%) of Fc receptor-positive (FcR+) T cells. A similar inhibition was observed with anti-H-2D and anti-H-2K sera but not with anti-Thy 1.2. Despite the presence of Ia determinants on peripheral T cells, as established by the inhibition of AgAb binding, Ia could not be detected on peripheral T cells by immunofluorescence assays. Data obtained with the AgAb-binding inhibition assay indicate that determinants controlled by loci mapping in the I-A and I-C, S, or G regions are present on the FcR+ T cells. Evidence is presented that subpopulations of T cells within the FcR+ T-cell population may be distinguishable on the basis of which I-region-controlled determinant is expressed. The data are discussed in terms of phenotypic and functional heterogeneity of T lymphocytes.
mesh_terms: D000818:Animals; D000936:Antigen-Antibody Complex; D000937:Antigen-Antibody Reactions; D001665:Binding Sites; D002874:Chromosome Mapping; D000939:Epitopes; D005260:Female; D005796:Genes; D008040:Genetic Linkage; D006649:Histocompatibility Antigens; D007141:Immunoglobulin Fc Fragments; D007519:Isoantigens / Q000032:analysis; D008297:Male; D051379:Mice; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000936:Antigen-Antibody Complex; D000939:Epitopes; D006649:Histocompatibility Antigens; D007141:Immunoglobulin Fc Fragments; D007519:Isoantigens