title: Mechanism(s) of in vitro macrophage activation with Nocardia rubra cell wall skeleton: the effects on macrophage activating factor production by lymphocytes.
abstract: BALB/c mouse peritoneal macrophages prepared from WPC which had been treated with N. CWS demonstrated potent cytostatic activity against syngeneic Meth A fibrosarcoma cells. The maximum cytostatic activity developed in the macrophages when WPC were incubated with 25 micrograms/ml N. CWS for 3 days. NAPC from BALB/c mice given an i.p. injection with 100 micrograms N. CWS 7 days previously (N. CWS-NAPC) or supernatants from N. CWS-NAPC also activated peritoneal macrophages in vitro. However, when peritoneal macrophages were incubated with N. CWS in the absence of NAPC, or when T cells were depleted from WPC by treatment with anti-Thy 1.2 antibody and complement, N. CWS failed to enhance the cytostatic activity of the macrophages. Furthermore, thioglycollate-elicited peritoneal macrophages from C3H/HeN mice increased their cytolytic properties by incubation with supernatant fluids from N. CWS-treated spleen cells. These findings suggest that in vitro macrophage activation with N. CWS depends on MAF secreted from T lymphocytes.
mesh_terms: D000818:Animals; D002448:Cell Adhesion; D002469:Cell Separation; D002473:Cell Wall / Q000276:immunology; D002474:Cell-Free System; D008214:Lymphocytes / Q000378:metabolism*; D008222:Lymphokines / Q000096:biosynthesis*; D008262:Macrophage Activation; D016215:Macrophage-Activating Factors; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D009615:Nocardia / Q000276:immunology*; D010529:Peritoneal Cavity / Q000166:cytology; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D008222:Lymphokines; D016215:Macrophage-Activating Factors