title: Induction of activated macrophages by intraperitoneal injection of mitomycin C in mice.
abstract: The host cellular response to IP injection of mitomycin C was studied in C3H/HeN mice. As assessed by in vitro cytolysis assay using 125I-iododeoxyuridine-labelled tumour target cells, mitomycin C-induced peritoneal macrophages showed the maximum tumouricidal activity 4 days after the IP injection. The tumouricidal activity was dependent on the dose of mitomycin C injected and it was detectable against syngeneic, allogeneic and xenogeneic tumour target cells. In addition, these tumouricidal macrophages were found to be augmented in functions of both incorporation of 2-deoxy-D-glucose and phagocytosis of sheep red blood cells. Among the other anti-cancer drugs, which were used at a dose of three-fifths of LD50, only adriamycin (7.5 mg/kg) was capable of inducing activated macrophages as much as mitomycin C (3 mg/kg). Cyclophosphamide (225 mg/kg), methotrexate (60 mg/kg) and vincristine (1.5 mg/kg) were able to augment incorporation of 2-deoxy-D-glucose and phagocytosis of sheep red blood cells, but not tumouricidal activity. Differential cytolysis assay was performed for two cell lines of P 388 tumour target cells, the mitomycin C-sensitive original cell line and the mitomycin C-resistant subline, demonstrating no significant difference in macrophage-mediated tumour cell lysis between these cell lines. Based on these results, it was concluded that mitomycin C, when injected IP induced activated macrophages in the peritoneal cavity. A better understanding of the effect of anti-cancer drugs on macrophage tumouricidal activity may be useful in designing more effective local chemotherapy for malignant peritoneal effusions.
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D007274:Injections, Intraperitoneal; D008262:Macrophage Activation / Q000187:drug effects*; D008264:Macrophages / Q000276:immunology; D051379:Mice; D008809:Mice, Inbred C3H; D016685:Mitomycin; D008937:Mitomycins / Q000008:administration & dosage / Q000494:pharmacology*; D009374:Neoplasms, Experimental / Q000473:pathology
chemical_list: D000970:Antineoplastic Agents; D008937:Mitomycins; D016685:Mitomycin