title: H-2 restriction of cell-mediated immunity to an intracellular bacterium: effector T cells are specific for Listeria antigen in association with H-21 region-coded self-markers.
abstract: The protective activity of anti-Listeria-immune T cells assayed in an adoptive transfer system in H-2 restricted. As shown in the present studies, the demonstration of the restriction is directly dependent on the dose and the relative protective activity of spleen cells. In addition, some H-2-unrestricted protection is conferred predominantly by other than immunoglobulin-negative spleen cells. Thus, the activity of Listeria-immune T cells appears to be 'absolutely' restricted and is in this respect comparable to in vivo T-cell-mediated anti-viral protection. The predominant genetic region of H-2 coding for the structures which are mainly involved in this restriction in T-cell immunity to this prototype intracellular bacterium is the I region. The specificity of Listeria-immune T cells is determined by the H-2 haplotype of the donor. Thus, F1 hybrids seem to possess at least two separable sets of T cells, each specific for one parental haplotype. As is true in the virus model, the results cannot distinguish between an altered-self or a dual recognition model of T-cell recognition to explain H-2 restriction. They are, however, compatible with the idea and I-coded cell surface structures may serve as receptors for cell-specific differentiation signals, which trigger direct or lymphokin-mediated activation of macrophages to manifest increased bactericidal capacity. The interesting parallels in self-marker recognition of T cells in the virus and intracellular bacterium systems, respectively, appear to be reasonably explained by the different types of signals transmitted by T cells to various target cells via the distinctly different self-markers employed (i.e., K or D vs I).
mesh_terms: D000818:Animals; D000961:Antilymphocyte Serum; D004306:Dose-Response Relationship, Immunologic; D000939:Epitopes; D006649:Histocompatibility Antigens; D007111:Immunity, Cellular; D007116:Immunization, Passive; D007158:Immunologic Techniques; D008088:Listeriosis / Q000276:immunology*; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008815:Mice, Inbred Strains; D011947:Receptors, Antigen, B-Cell; D013154:Spleen / Q000637:transplantation; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000961:Antilymphocyte Serum; D000939:Epitopes; D006649:Histocompatibility Antigens; D011947:Receptors, Antigen, B-Cell