title: Presentation of antigen by mixed isotype class II molecules in normal H-2d mice.
abstract: A panel of DBA/2 T cell hybridomas specific for the sperm whale myoglobin epitope 110-121 was found to recognize antigen presented by the mixed isotype class II molecule E alpha dA beta d. The response was blocked by monoclonal antibodies specific for E alpha and A beta d chains; in addition, the hybridomas responded to antigen presented by L cells expressing E alpha A beta d molecules, and made no response with L cells expressing I-Ad or I-Ed molecules. Two more groups of hybridomas isolated from DBA/2 and B10.D2 mice immunized with myoglobin also recognized peptide 110-121 presented by E alpha d A beta d. Thus, although it is expressed at biochemically undetectable levels on spleen cells, the E alpha d A beta d molecule is an important presenting element in normal H-2d mice making a conventional immune response to a protein antigen. These results suggest that high levels of class II expression are not a prerequisite for T cell activation.
authors.affiliation: Department of Medicine, Stanford University School of Medicine, California 94305.
authors.forename: G
authors.initials: G
authors.lastname: Ruberti
authors.forename: K S
authors.initials: KS
authors.lastname: Sellins
authors.forename: C M
authors.initials: CM
authors.lastname: Hill
authors.forename: R N
authors.initials: RN
authors.lastname: Germain
authors.forename: C G
authors.initials: CG
authors.lastname: Fathman
authors.forename: A
authors.initials: A
authors.lastname: Livingstone
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000938:Antigen-Presenting Cells / Q000276:immunology*; D001666:Binding Sites, Antibody; D006183:H-2 Antigens / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006825:Hybridomas / Q000276:immunology; D007376:Interleukin-2 / Q000032:analysis; D046911:Macromolecular Substances; D008297:Male; D051379:Mice; D008811:Mice, Inbred DBA; D009211:Myoglobin / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D007376:Interleukin-2; D046911:Macromolecular Substances; D009211:Myoglobin