title: Combination tumor-immunotherapy with recombinant tumor necrosis factor and recombinant interleukin 2 in mice.
abstract: Recombinant human tumor necrosis factor (r-TNF) inhibits growth of various mouse tumor cell lines both in vitro and in vivo. Treatment of established tumor nodules with intratumoral (i.t.) injection of r-TNF caused hemorrhagic necrosis of tumor and temporary disappearance of tumor mass. However, a small number of tumor cells remained and later formed fresh nodules. In striking contrast, combination therapy with r-TNF and recombinant human interleukin-2 (r-IL-2) resulted in a marked inhibition of regrowth of tumor cells. More than 60% of MBL-2-bearing mice were completely cured of tumor by treatment with r-TNF and r-IL-2. Cured mice could also reject rechallenged MBL-2 lymphoma cells, indicating the generation of anti-tumor effector cells in vivo. However, lymphocytes obtained from mice cured of MBL-2 showed no significant in vitro cytotoxic activity against MBL-2 lymphoma cells. In contrast, in vitro sensitization of spleen cells from cured mice with mitomycin-C-treated MBL-2 lymphoma cells resulted in the generation of cytotoxic cells against MBL-2 lymphoma cells. Moreover, spleen cells from mice cured of MBL-2 by treatment with r-TNF and r-IL-2 revealed a strong anti-tumor activity upon in vivo neutralization tests. These results strongly suggest that tumor-bearing mice can acquire systemic immunological memory after combination therapy with r-TNF and r-IL-2.
mesh_terms: D000818:Animals; D002460:Cell Line; D003602:Cytotoxicity, Immunologic; D004357:Drug Synergism; D004359:Drug Therapy, Combination; D006023:Glycoproteins / Q000008:administration & dosage*; D007376:Interleukin-2 / Q000008:administration & dosage*; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D009374:Neoplasms, Experimental / Q000276:immunology / Q000628:therapy*; D011994:Recombinant Proteins / Q000008:administration & dosage; D014409:Tumor Necrosis Factor-alpha
chemical_list: D006023:Glycoproteins; D007376:Interleukin-2; D011994:Recombinant Proteins; D014409:Tumor Necrosis Factor-alpha