title: Potentiation of tumoricidal properties of murine macrophages by Nocardia rubra cell wall skeleton (N-CWS).
abstract: Intraperitoneal injection of squalene-treated cell wall skeleton of Nocardia rubra (N-CWS) caused increase in number of peritoneal exudate cells (PEC). Adherent macrophages obtained from N-CWS-treated PEC suppressed growth of methylcholanthrene-induced fibrosarcoma (Meth-A), when injected intradermally with the tumor cells into BALB/c mice. The macrophages showed strong cytotoxicity against Meth-A cells in vitro. When treated with 10 micrograms/ml of N-CWS in vitro, proteose peptone-induced macrophages acquired tumoricidal property but resident macrophages showed no cytotoxicity after the treatment. In the supernatant of spleen cells cultured for 72 hours in the presence of N-CWS (10 micrograms/ml), the presence of (a) factor(s) with macrophage activating effect was observed. This factor, shown to be identical to macrophage activating factor (MAF) in molecular weight, showed synergy with N-CWS in potentiating macrophage cytotoxicity against tumor cells.
mesh_terms: D000276:Adjuvants, Immunologic / Q000302:isolation & purification*; D000818:Animals; D002460:Cell Line; D002470:Cell Survival; D002473:Cell Wall / Q000276:immunology; D005260:Female; D005354:Fibrosarcoma / Q000276:immunology; D066298:In Vitro Techniques; D008222:Lymphokines / Q000096:biosynthesis; D016215:Macrophage-Activating Factors; D008264:Macrophages / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D009615:Nocardia / Q000276:immunology*; D013154:Spleen / Q000276:immunology
chemical_list: D000276:Adjuvants, Immunologic; D008222:Lymphokines; D016215:Macrophage-Activating Factors