title: Prolongation of kidney graft survival by cyclophosphamide-induced tolerance in rats.
abstract: In this study, we have extended a cyclophosphamide (CP)-induced tolerance system to kidney transplantation in rats to examine whether or not we can overcome fully allogeneic (major histocompatibility complex plus minor histocompatibility) antigen barriers in organ transplantation. In the recipient Lewis (LEW, RT1(1)) rats that were primed intravenously with 4 x 10(8) spleen cells plus 2 x 10(8) bone marrow cells from Brown-Norway (BN, RT1n) rats and treated intraperitoneally with 100 mg./kg. of cyclophosphamide (CP) 2 days later, the survival of kidney allografts, but not skin allografts, from BN was prolonged as compared with that in the untreated LEW rats. Some of the kidney allografts survived for more than 100 days without further immunosuppressants. The tolerant state induced was tolerogen specific, and the suppression of tissue damage of the grafted kidney in such tolerant rats was also confirmed by the histopathological findings of the grafted kidney. These results indicate that considerable levels of tolerance can be induced, at least in organ transplantation, across fully allogeneic antigen barriers in rats by a CP-induced tolerance system. We believe that the present study is the first step in applying our CP-induced tolerance system using skin grafting in the murine model to clinical organ transplantation.
authors.affiliation: Department of Urology, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Eto
authors.forename: Y
authors.initials: Y
authors.lastname: Nishimura
authors.forename: K
authors.initials: K
authors.lastname: Matsuo
authors.forename: K
authors.initials: K
authors.lastname: Omoto
authors.forename: K
authors.initials: K
authors.lastname: Goto
authors.forename: J
authors.initials: J
authors.lastname: Kumuzawa
authors.forename: K
authors.initials: K
authors.lastname: Nomoto
mesh_terms: D000818:Animals; D016026:Bone Marrow Transplantation / Q000276:immunology; D017690:Cell Transplantation; D003520:Cyclophosphamide / Q000494:pharmacology*; D006084:Graft Rejection / Q000517:prevention & control*; D006085:Graft Survival / Q000187:drug effects*; D007108:Immune Tolerance / Q000187:drug effects / Q000276:immunology*; D016030:Kidney Transplantation / Q000276:immunology* / Q000502:physiology; D008297:Male; D051381:Rats; D011914:Rats, Inbred BN; D011917:Rats, Inbred Lew; D016038:Skin Transplantation / Q000276:immunology; D013154:Spleen / Q000166:cytology
chemical_list: D003520:Cyclophosphamide