title: Deletion of donor-reactive T lymphocytes in adult mice after intrathymic inoculation with lymphoid cells.
abstract: Clonal deletion of self antigen-reactive T lymphocytes is known to be a dominant mechanism of tolerance induction in the normal immune system. This report considers whether deletion of antigen-reactive T cells is also the immunologic basis for the recently described model of transplantation tolerance that follows intrathymic inoculation with allogeneic lymphoid cells. We found that the outcome of injecting Mlsa- hosts with lymphocytes from Mlsa+ donors was depletion of V beta 6+ T cells (which are known to be reactive with the Mlsa superantigen). The process was found to be specific in that a similar reduction was not seen in an irrelevant T cell population (V beta 8+) in IT injected hosts. Deletion was observed in this model only if immunosuppression with ALS or anti-CD4 accompanied intrathymic injection. When the inoculum of allogeneic lymphocytes was administered intravenously instead of intrathymically only minimal deletion was observed. The induction of transplantation tolerance by intrathymic injection of donor lymphoid cells may prove especially efficacious since it relies on deletion of only those T cells specifically reactive to donor antigens, a process analogous to tolerance induction to self antigens.
authors.affiliation: Department of Surgery, Hospital of the University of Pennsylvania, Philadelphia 19104.
authors.forename: J F
authors.initials: JF
authors.lastname: Markmann
authors.forename: J S
authors.initials: JS
authors.lastname: Odorico
authors.forename: H
authors.initials: H
authors.lastname: Bassiri
authors.forename: N
authors.initials: N
authors.lastname: Desai
authors.forename: J I
authors.initials: JI
authors.lastname: Kim
authors.forename: C F
authors.initials: CF
authors.lastname: Barker
mesh_terms: D000818:Animals; D000961:Antilymphocyte Serum / Q000494:pharmacology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D016827:CD8 Antigens / Q000032:analysis; D006085:Graft Survival / Q000276:immunology; D007165:Immunosuppression Therapy; D007166:Immunosuppressive Agents / Q000494:pharmacology; D016219:Immunotherapy, Adoptive; D007267:Injections; D007700:Kinetics; D008212:Lymphocyte Depletion; D008221:Lymphoid Tissue / Q000166:cytology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008811:Mice, Inbred DBA; D016747:Minor Lymphocyte Stimulatory Antigens / Q000032:analysis; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics; D016038:Skin Transplantation / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology
chemical_list: D000961:Antilymphocyte Serum; D016827:CD8 Antigens; D007166:Immunosuppressive Agents; D016747:Minor Lymphocyte Stimulatory Antigens; D016693:Receptors, Antigen, T-Cell, alpha-beta