title: MHC-linked Ir gene control of T cell responses: GAT-specific proliferating T cells and helper T cells are elicited in nonresponder mice immunized with soluble GAT.
abstract: The immune response to the synthetic terpolymer GAT is controlled by MHC-linked Ir gene(s). We show in this paper that antigen-presenting cells and T cells from mice belonging to two nonresponder strains (SJL and DBA/1) can present and recognize GAT, respectively. This has been measured with a T cell proliferation assay of GAT-primed lymph node cells. In order to detect T cell proliferation among GAT-primed lymph node cells from DBA/1 mice, it is necessary to treat the cells with monoclonal anti-Lyt-2 antibodies and complement (C) before the assay. These conclusions were further verified with SJL mice, when a T cell line derived from LN cells was used. We have shown that after immunization with GAT, specific T helper cells can be generated in the lymph nodes of SJL mice but not in the lymph nodes of DBA/1 mice. Furthermore, GAT-specific T helper cells can be detected in the spleen of SJL mice after immunizations with GAT, provided these spleen cells are pretreated with monoclonal anti-Lyt-2 antibodies + C or mild irradiation. Together, these results support the general idea that nonresponsiveness can be explained by a regulatory imbalance rather than by discrete cellular "defects."
mesh_terms: D000818:Animals; D000939:Epitopes; D005802:Genes, MHC Class II; D006183:H-2 Antigens / Q000235:genetics / Q000276:immunology; D007108:Immune Tolerance; D007114:Immunization; D007519:Isoantigens / Q000276:immunology; D008198:Lymph Nodes / Q000166:cytology; D008213:Lymphocyte Activation; D008211:Lymphocyte Cooperation; D051379:Mice; D008805:Mice, Inbred A; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D010455:Peptides / Q000008:administration & dosage / Q000276:immunology*; D011108:Polymers; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology
chemical_list: D000939:Epitopes; D006183:H-2 Antigens; D007519:Isoantigens; D010455:Peptides; D011108:Polymers; C020749:GAT