title: Immune-mediated arrest and reversal of established visceral metastases in athymic mice.
abstract: The metastasizing MDAY-D2 tumor of DBA/2 mice disseminates in BALB/c allogeneic athymic nude (nu/nu) mice in a manner identical to that observed in the syngeneic host. Both the kinetics and organ distribution pattern of metastases from s.c. implants of MDAY-D2 are routinely predictable at any given tumor dose. BALB/c heterozygote (nu/+) litter-mates reject MDAY-D2 grafts on the basis of the multiple minor histocompatibility differences that exist between DBA/2 and BALB/c mice. The in vitro cell-mediated cytotoxic response detected in tumor-bearing BALB/c nu/+ mice is "low grade" (isotope release is approximately 40 to 50% by 24-hr 111-indium-8-hydroxyquinoline assay and approximately 6 to 8% by 6-hr 51Cr assay) and yet correlates directly with tumor rejection. BALB/c nu/nu mice can be protected against MDAY-D2 by previous reconstitution with lymphoid cells from normal or MDAY-D2-sensitized BALB/c nu/+ mice. In addition, surgically documented, established visceral metastases in BALB/c nu/nu mice can be arrested and regressed by the adoptive transfer of MDAY-D2-sensitized BALB/c nu/+ spleen cells. This represents one of the few models where established metastases have been immunotherapeutically regressed. As such, the MDAY-D2 BALB/c nu/nu mouse model offers unique advantages for studying the role of the immune system in regulating the metastatic process.
mesh_terms: D000008:Abdominal Neoplasms / Q000276:immunology / Q000556:secondary*; D000818:Animals; D003602:Cytotoxicity, Immunologic; D005260:Female; D006084:Graft Rejection; D007109:Immunity; D007116:Immunization, Passive; D066298:In Vitro Techniques; D051379:Mice; D008815:Mice, Inbred Strains; D008819:Mice, Nude; D009362:Neoplasm Metastasis; D012513:Sarcoma, Experimental / Q000276:immunology / Q000556:secondary*