title: Cytotoxic cells induced in tumor-bearing rats by a streptococcus preparation (OK-432).
abstract: The characteristics of the cytotoxic cells induced by ip injections of an immunoadjuvant, OK-432 (Picibanil), into ACI/N rats bearing syngeneic bladder cancer, BC47, were examined. The cytostatic activity, but not the cytolytic activity, of peritoneal macrophages was augmented when either normal or cancer-bearing rats were treated with OK-432. In contrast, the plastic nonadherent cells of the peritoneal exudate cells from OK-432-treated cancer bearing rats, but not lymph node cells or spleen cells, killed all ACI/N rat bladder cancers tested as well as ACI/N rat hepatoma cells and Meth-A mouse sarcoma cells. The plastic nonadherent cells from OK-432-treated normal rats also killed hepatoma cells and Meth-A cells, but not bladder cancer cells. The cytolytic cells that were induced in cancer-bearing rats by OK-432 treatment and showed cytolytic activity specific for bladder cancer were found to be sensitive to anti-rat thymocyte serum and complement, nylon-adherent, and Fc receptor-negative. The cells that showed nonselective cytolytic activity were nylon-adherent and insensitive to anti-rat thymocyte serum and complement.
mesh_terms: D000818:Animals; D001688:Biological Products / Q000494:pharmacology*; D002448:Cell Adhesion / Q000187:drug effects; D002460:Cell Line; D003602:Cytotoxicity, Immunologic / Q000187:drug effects*; D004261:DNA Replication / Q000187:drug effects; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009374:Neoplasms, Experimental / Q000276:immunology; D010844:Picibanil / Q000494:pharmacology*; D051381:Rats; D011912:Rats, Inbred ACI; D012513:Sarcoma, Experimental / Q000276:immunology; D001749:Urinary Bladder Neoplasms / Q000276:immunology*
chemical_list: D001688:Biological Products; D010844:Picibanil