title: Nature of the suppressor cells mediating prolonged graft survival after administration of extracted histocompatibility antigen and cyclosporine.
abstract: Antigen-specific suppressor T cells are induced by donor histocompatibility antigen extracted from spleen cells with 3M KCl combined with cyclosporine (Ag-CsA). A single i.v. injection of 5 mg 3M-KCl-extracted donor Buffalo (Buf, RT1b) antigen (Ag) combined with a three day course of CsA prolonged renal allograft survival in Wistar-Furth (WFu, RT1u) hosts to a greater extent (MST 26.5 days) than CsA alone (MST 11.8 days). Peripheral blood lymphocytes (PBL) or spleen cells harvested from Ag-CsA-treated recipients ten days after transplantation inhibited the mixed lymphocyte reaction (MLR) between normal responder WFu cells and irradiated Buf cells (55.6% and 64.4% suppression, respectively, P less than 0.025), but not third-party Brown-Norway (BN, RT1n) stimulator cells (13.6% and -18.3% suppression, respectively, NS). The suppressor effect was not mediated by cytolytic cells; there was neither primary nor secondary cytolytic activity against 51Cr-labeled Con-A blastoid Buf cells. The suppressor cells were neither adherent to plastic dishes nor to nylon-wool columns. PBL irradiated with 800 rads, but not 1500 rads, suppressed the MLR. A single injection of cyclophosphamide (CY, 25 mg/kg) seven days after transplantation abrogated the suppression induced by Ag-CsA treatment. Moreover, PBL from Ag-CsA recipients failed to suppress the MLR, if depleted either of all T cells by treatment with monoclonal antibody (Mab) W3/13 HLK (pan T cells; % suppression -15.8), or of cytotoxic/suppressor cells with Mab OX-8 (-19.3% suppression) together with rabbit antimouse immunoglobulin and complement. On the other hand, PBL treated with the Mab W3/25 (helper) showed suppressor cell activity (+56.4%, P less than 0.001) similar to untreated cells (62.4%, P less than 0.001). Moreover, adoptive transfer of suppressor T cells purified from pooled lymphocytes by rosetting using Mab significantly prolonged the survival of donor-specific, but not third-party, test grafts in naive secondary hosts. Thus, these studies demonstrated antigen-specific suppressor T cells mediate the long-term unresponsiveness induced by the Ag-CsA regimen.
authors.forename: N
authors.initials: N
authors.lastname: Yoshimura
authors.forename: B D
authors.initials: BD
authors.lastname: Kahan
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D003520:Cyclophosphamide / Q000494:pharmacology; D003524:Cyclosporins / Q000494:pharmacology*; D006085:Graft Survival / Q000187:drug effects; D006649:Histocompatibility Antigens / Q000008:administration & dosage*; D008297:Male; D051381:Rats; D013601:T-Lymphocytes / Q000276:immunology; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology* / Q000528:radiation effects
chemical_list: D000911:Antibodies, Monoclonal; D003524:Cyclosporins; D006649:Histocompatibility Antigens; D003520:Cyclophosphamide