title: Endogenous lipoxygenase metabolites mediate A23187 induced macrophage cytostasis towards P815 tumor cells in vitro.
abstract: The calcium ionophore A23187 stimulated cytostatic activity of peritoneal macrophages towards P815 tumor cells in coculture served as a model for macrophage activation. A macrophage enriched preparation, separated on the basis of cell size in a discontinuous fetal calf serum gradient column, expressed cytostatic activity when stimulated by A23187. This was inhibited dose-dependently, by AA-861 but not by nordihydroguaiaretic acid (NDGA). AA-861 inhibited the 5-lipoxygenase specifically, NDGA inhibited both lipoxygenase- and cyclooxygenase activity: The ratio cyclooxygenase/lipoxygenase products increased with AA-861 but not with NDGA. These results show that lipoxygenase products are necessary for expression of cytostatic activity of these arachidonic acid metabolite producing macrophages and that the ratio of cyclooxygenase/lipoxygenase metabolites plays an important role in macrophage activation.
authors.affiliation: Institute of Pharmacology, Erasmus University, Rotterdam, The Netherlands.
authors.forename: J A
authors.initials: JA
authors.lastname: van Hilten
authors.forename: G R
authors.initials: GR
authors.lastname: Elliott
authors.forename: I L
authors.initials: IL
authors.lastname: Bonta
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology; D016227:Benzoquinones; D000001:Calcimycin / Q000494:pharmacology*; D008084:Lipoxygenase / Q000378:metabolism*; D016859:Lipoxygenase Inhibitors; D008262:Macrophage Activation / Q000187:drug effects*; D009637:Masoprocol / Q000494:pharmacology; D051379:Mice; D011809:Quinones / Q000494:pharmacology; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000970:Antineoplastic Agents; D016227:Benzoquinones; D016859:Lipoxygenase Inhibitors; D011809:Quinones; D000001:Calcimycin; D009637:Masoprocol; C036837:2,3,5-trimethyl-6-(12-hydroxy-5,10-dodecadiynyl)-1,4-benzoquinone; D008084:Lipoxygenase