title: Requirement for an Ia-bearing accessory cell in Con A-induced T cell proliferation.
abstract: Pretreatment of murine lymphoid cells with anti-Ia and C abrogated the proliferative response of these cells to Con A, but not to PHA. Reconstitution experiments demonstrated that T cell-enriched populations failed to restore Con A responsiveness and that T cell-depleted populations were more effective in restoring responsiveness to Con A. In particular, a population of 1000 R resistant, glass-adherent, non-T spleen cells was capable of completely restoring responsiveness to Con A when added in numbers as low as 4% of cultured cells. These splenic adherent cells were found to express Ia determinants encoded by at least two genes: one in I-A and the other in I-B, I-J, and/or I-E/C, and it was demonstrated that determinants encoded in these two regions were expressed on the same cell. These results demonstrate that non-T accessory cells may be the Ia+ cells entirely responsible for the anti-Ia and C-induced abrogation of T cell proliferative responses to Con A.
mesh_terms: D000818:Animals; D002448:Cell Adhesion; D002469:Cell Separation; D003165:Complement System Proteins; D003208:Concanavalin A / Q000494:pharmacology*; D000939:Epitopes; D007106:Immune Sera / Q000494:pharmacology; D008198:Lymph Nodes / Q000276:immunology; D008213:Lymphocyte Activation; D008285:Major Histocompatibility Complex; D051379:Mice; D008805:Mice, Inbred A; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D013154:Spleen / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013997:Time Factors
chemical_list: D000939:Epitopes; D007106:Immune Sera; D003208:Concanavalin A; D003165:Complement System Proteins