title: The cytotoxic effect of mouse macrophages stimulated in vitro by a beta-1,3-D-glucan from yeast cell walls.
abstract: Macrophages stimulated by an insoluble beta-1,3-D-glucan from yeast cell walls were able to destroy tumour cells as measured by the release of radioactive label from prelabelled 14C-thymidine cells. Target cells were B-16 melanoma, P-815 mastocytoma, and the L-929 cell line. A significant target cell killing by macrophages stimulated by glucan was observed after 72-96 h. The cytolysis of L-929 cells was investigated in some detail. No stable soluble cytolytic factor appeared to be released into the medium during the stimulation of macrophages by glucan, since cell-free spent medium had no cytotoxic effect on L-929 cells. The densities of the macrophage monolayers were critical for an effective target cell killing; dense cultures showed more cytotoxicity than less dense cultures. The kinetics of the development of macrophage-mediated cytotoxicity suggests a minimum stimulation period of 4 days for maximal cytolysis.
mesh_terms: D000818:Animals; D002452:Cell Count; D002473:Cell Wall / Q000276:immunology; D003470:Culture Media; D003602:Cytotoxicity, Immunologic; D005260:Female; D005936:Glucans / Q000276:immunology*; D066298:In Vitro Techniques; D007739:L Cells / Q000276:immunology; D008262:Macrophage Activation; D008264:Macrophages / Q000276:immunology*; D008297:Male; D051379:Mice; D009374:Neoplasms, Experimental / Q000276:immunology; D012441:Saccharomyces cerevisiae / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D003470:Culture Media; D005936:Glucans