title: LPS-or 8Br-cyclic AMP-induced production of T cell-activating factor(s) in macrophage tumor cell line J774.1.
abstract: The macrophage tumor cell line J774.1 replaced the function of normal macrophages in the induction of polyclonal killer T cells with 2-mercaptoethanol. J774.1 does not normally release soluble factor(s) which we have shown to be responsible for the differentiation of T cells to killer T cells. However, stimulation of J774.1 with LPS induced soluble factor(s) for T cell activation. An optimum concentration of LPS for the production of soluble factor(s) was 1 to 10 microgram/ml, which completely inhibited growth of the tumor cells. The production of soluble factor(s) was observed within 6 hr after LPS stimulation and reached its maximum level at 24 hr. Incubation of the cell line with 8Br-cyclic AMP and theophylline induced soluble factor(s), suggesting that LPS stimulation induced an increase in intracellular cyclic AMP which leads to the synthesis of soluble factor(s).
mesh_terms: D000818:Animals; D002460:Cell Line; D002471:Cell Transformation, Neoplastic; D000242:Cyclic AMP / Q000494:pharmacology*; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D007694:Killer Cells, Natural; D007700:Kinetics; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008264:Macrophages; D008623:Mercaptoethanol / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D009374:Neoplasms, Experimental / Q000276:immunology*; D012995:Solubility; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D008070:Lipopolysaccharides; D008623:Mercaptoethanol; D000242:Cyclic AMP