Induction of T cell responses in nonresponder mice by abolishing suppression with monoclonal antibodies recognizing A region-controlled, T cell-specific determinants.
Mouse strains carrying the kappa allele at loci A beta, A alpha, E beta, and E alpha are nonresponders to lactate dehydrogenase B (LDHB) and to allotypic determinants of IgG2a myeloma proteins (for example, UPC10 used in this study). The nonresponsiveness to these antigens is caused by T suppressor (Ts) cells that prevent antigen-primed T helper (Th) cells from proliferating. We demonstrate here that monoclonal antibodies specific for an A region-controlled molecule selectively expressed on T cells (A-T) are capable of inducing anti-LDHB and anti-UPC10 responses of primed T cells from nonresponder strains. A monoclonal anti-J antibody that cross-reacts with the A-T molecule also induces responsiveness, whereas another J-specific antibody that lacks this cross-reactivity fails to do so. The mechanism of response induction is blocking of the interaction between the Ts cell or its factor (TsF) and the target of suppression, the antigen-specific Lyt-1+2- (Th) cell. The blocking occurs at the level of the Ts cell and the TsF. The data indicate that Ts cells and TsF carry a unique, A region-controlled molecule that is not only functionally analogous but also serologically similar to the J molecule.
D000818:Animals; D000911:Antibodies, Monoclonal / Q000502:physiology*; D001667:Binding, Competitive; D000939:Epitopes / Q000235:genetics / Q000276:immunology*; D005260:Female; D005802:Genes, MHC Class II; D007108:Immune Tolerance; D007770:L-Lactate Dehydrogenase / Q000276:immunology; D008213:Lymphocyte Activation; D008222:Lymphokines / Q000502:physiology; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D009194:Myeloma Proteins / Q000276:immunology; D013491:Suppressor Factors, Immunologic; D013601:T-Lymphocytes / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
D000911:Antibodies, Monoclonal; D000939:Epitopes; D008222:Lymphokines; D009194:Myeloma Proteins; D013491:Suppressor Factors, Immunologic; D007770:L-Lactate Dehydrogenase