title: Characterization of an Lyt-1+ cytolytic T-cell clone specific for a polymorphic domain of the I-Ak molecule.
abstract: We have characterized a cytolytic T-cell clone, isolated from a A.TH anti-A.TL mixed lymphocyte culture, which recognized a private determinant of the I-Ak molecule. This specificity has been confirmed by inhibition of effector-target cell interaction by anti-I-Ak monoclonal antibody (mAb). Comparison of the inhibitory capacity of various mAb and the spatial arrangement of their epitopes (defined in previous studies by antibody-binding competition) indicated that the antigenic site recognized by this cytolytic T-cell clone was topologically related to one of the major polymorphic domains of the Ak molecule. This clone expressed the Thy-1.2+, Lyt-1.+, Lyt-1.2+low and I-As- cell surface phenotype. Testing of several rat mAb, screened for their ability to inhibit H-2K/D-specific cytolysis at the level of the effector cells, revealed that two anti-p94, 180 mAb but not various anti-Lyt-2 mAb inhibited the lytic function of this anti-I-Ak T-cell clone.
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000235:genetics / Q000276:immunology*; D000961:Antilymphocyte Serum / Q000494:pharmacology; D002874:Chromosome Mapping; D002999:Clone Cells / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D000939:Epitopes / Q000235:genetics / Q000276:immunology; D005260:Female; D005802:Genes, MHC Class II; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D008297:Male; D051379:Mice; D008805:Mice, Inbred A; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008811:Mice, Inbred DBA; D010641:Phenotype; D011110:Polymorphism, Genetic; D051381:Rats; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000950:Antigens, Ly; D000961:Antilymphocyte Serum; D000939:Epitopes; D000949:Histocompatibility Antigens Class II