title: Synergistic effect of donor-specific blood transfusion and a short course of deoxyspergualin in rat kidney transplantation.
abstract: Deoxyspergualin (DSG), an analogue of spergualin produced by B. laterosporus, has a strong immunosuppressive effect in various transplantation models. We have investigated the mechanism of donor-specific prolongation of survival time in rat kidney grafting by donor-specific blood transfusion (DST) and a short course of DSG. Lewis (LEW) kidney allografts were transplanted into fully allogeneic BN rats. Fresh, whole LEW blood 1.0 ml, was injected i.v. into BN rats 2 days prior to transplantation. Then, DSG, 6 mg/kg per day, was administered by i.m. injection on days 0, 1, and 2 after transplantation. The recipients were divided into five groups: group 1 (n = 6) no treatment: group 2 (n = 6) DST only; group 3 (n = 7) DSG only; group 4 (n = 7) DST and DSG; and group 5 (n = 6), third party (ACI rats) blood transfusion and DSG. Lymphocytes (cervical lymph nodes) and serum were harvested from BN recipients on day 7 postgrafting. For suppressor cell assays, lymphocytes from BN recipients in each group were added as a third cell to the mixed lymphocyte reaction (MLC) between nontransplanted BN lymphocytes (responder) and LEW or other third party (PVGC, ACI, WKA rats) lymphocytes (stimulator). Antidonor lymphocytotoxic antibody (ADLA) was checked by microcytotoxicity assays. Median survival times (MST) for each group were: group 1, 10 days; group 2, 10 days; group 3, 13 days; group 4, 75 days; and group 5, 13 days. Remarkable prolongation of MST was only noted in group 4. In the suppressor cell assay, group 4 showed significant suppression (40%; P > or = 0.05); the other groups did not show any suppression. This suppressive activity in group 4 was effective only during the MLC between BN and LEW, not during the MLC of third party-BN combinations. Thus, suppressor cells from DST/DSG-treated BN recipients appear to be donor-specific. In the microcytotoxicity assay, the only group that showed any ADLA was group 2, which was not treated with DSG. These results clearly show that both induction of donor-specific suppressor cells and inhibition of ADLA production are associated with the remarkable donor-specific prolongation of kidney allograft survival in DST/DSG-treated recipients.
authors.affiliation: Department of Urology, Tokyo Women's Medical College, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Tanabe
authors.forename: M
authors.initials: M
authors.lastname: Yasuo
authors.forename: K
authors.initials: K
authors.lastname: Nemoto
authors.forename: K
authors.initials: K
authors.lastname: Takahashi
authors.forename: H
authors.initials: H
authors.lastname: Toma
authors.forename: K
authors.initials: K
authors.lastname: Ota
mesh_terms: D000818:Animals; D001803:Blood Transfusion; D003601:Cytotoxicity Tests, Immunologic; D004357:Drug Synergism; D006082:Graft Enhancement, Immunologic; D006085:Graft Survival; D006146:Guanidines / Q000627:therapeutic use*; D007166:Immunosuppressive Agents / Q000627:therapeutic use*; D007518:Isoantibodies / Q000032:analysis / Q000276:immunology; D016030:Kidney Transplantation / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D011836:Radiation Tolerance; D051381:Rats; D011914:Rats, Inbred BN; D011917:Rats, Inbred Lew; D050378:T-Lymphocytes, Regulatory / Q000276:immunology / Q000528:radiation effects; D014184:Transplantation, Homologous
chemical_list: D006146:Guanidines; D007166:Immunosuppressive Agents; D007518:Isoantibodies; C037258:gusperimus