title: Studies on the generation and expression of H-2-controlled T helper function in chimeric mice: evidence for two levels of H-2 resitriction.
abstract: F1 leads to parental, semisyngeneic/semiallogeneic and fully allogeneic bone marrow radiation chimeras were used as a source of helper T cells in the in vitro anamnestic response to dinitrophenylated keyhole limpet hemocyanin. In F1 leads to parental and in semisyngeneic/semiallogeneic chimeras, a small population of helper T cells restricted to the H-2 haplotype present in the donor only was shown to co-exist with T cells restricted to the shared haplotype. Only the population restricted to the donor H-2 could be demonstrated in allochimeras, presumably due to a lack of antigen-presenting cells of host origin during priming. Under assay conditions where, in addition to T cell/macrophage interactions, a direct T-B cell contact was necessary ("linked" cooperation), the H-2 restrictions observed were absolute. When direct T-B cell contact was made unnecessary by a special experimental protocol ("unlinked" cooperation), H-2 restriction between T and B cells was overcome. Thus, the cellular interactions during the anamnestic immune response to T-dependent antigens seem to be H-2-restricted at two levels: T cell/macrophage and T-B cell interactions.
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D003433:Crosses, Genetic; D004136:Dinitrobenzenes / Q000276:immunology; D004912:Erythrocytes / Q000276:immunology; D006183:H-2 Antigens; D006238:Haploidy; D006433:Hemocyanins / Q000276:immunology; D008211:Lymphocyte Cooperation; D051379:Mice; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D011828:Radiation Chimera; D012756:Sheep; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D004136:Dinitrobenzenes; D006183:H-2 Antigens; D006433:Hemocyanins