title: Allogeneic versus syngeneic killer splenocytes as effector cells for the induction of graft-versus-tumor effect.
abstract: The effect of allogeneic versus syngeneic killer cells derived from normal or severe combined immunodeficiency disease (SCID) mice was evaluated for induction of antitumor reaction in a murine model of mammary carcinoma. Tumor cells of H-2d origin were injected intravenously into H-2(d/b) mice 24 hours after total body irradiation (4 Gy). On the following day, lymphokine-activated killer (LAK) splenocytes, derived from either minor (H-2d) or major (H-2b) histocompatibility complex (MHC)-mismatched parental normal mice or MHC (H-2b)-mismatched SCID mice, were given intravenously. LAK cells of H-2d normal or SCID mice, syngeneic to the tumor, were inoculated in parallel. The results show that LAK cells derived from minor histocompatibility complex-mismatched or MHC-mismatched parental normal mice improved the probability of tumor-free survival as compared with LAK cells syngeneic to the tumor cells, but they aggravated the severity of graft-versus-host disease. SCID splenocytes serving as a source of natural killer (NK) cells were expanded and activated in vitro by rIL-2 to obtain a sufficient number of DX5+ CD3- CD8- NK cells (SCID-LAK). H-2b SCID-LAK cells did not cause graft-versus-host disease and significantly delayed tumor growth compared with syngeneic H-2d SCID-LAK cells, as indicated by tumor colony assays in vitro and adoptive transfer experiments. However, the graft-versus-tumor effect was not long lasting, and treated mice finally died of tumor. Our results show an advantage of allogeneic over syngeneic cell therapy for achieving a graft-versus-tumor effect by rIL-2-activated T cells and NK cells. Periodic repetition of NK treatments may be required to achieve more durable antitumor effects.
authors.affiliation: Department of Bone Marrow Transplantation & Cancer Immunotherapy, Cell Therapy & Transplantation Research Center, Hadassah University Hospital, Jerusalem, Israel. morecki@hadassah.org.il
authors.forename: Shoshana
authors.initials: S
authors.lastname: Morecki
authors.forename: Elena
authors.initials: E
authors.lastname: Yacovlev
authors.forename: Yael
authors.initials: Y
authors.lastname: Gelfand
authors.forename: Anna
authors.initials: A
authors.lastname: Vilensky
authors.forename: Shimon
authors.initials: S
authors.lastname: Slavin
mesh_terms: D000818:Animals; D006086:Graft vs Host Disease / Q000276:immunology; D020350:Graft vs Tumor Effect / Q000276:immunology*; D006648:Histocompatibility; D015979:Killer Cells, Lymphokine-Activated / Q000637:transplantation*; D017710:Lymphocyte Transfusion; D015674:Mammary Neoplasms, Animal / Q000150:complications / Q000628:therapy; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D016513:Mice, SCID; D013154:Spleen / Q000166:cytology* / Q000276:immunology; D015996:Survival Rate; D014184:Transplantation, Homologous; D014185:Transplantation, Isogeneic