title: RNA synthesis inhibition stabilises urokinase mRNA in macrophages.
abstract: Urokinase-type plasminogen activator (uPA) mRNA is induced in macrophages by the lineage specific growth factor CSF-1. Upon removal of CSF-1 from bone marrow-derived macrophages (BMM), uPA mRNA decayed with a half-life of 2 h. If RNA synthesis inhibitors actinomycin D, 5,6-dichloro-1-beta-ribofuranosyl benzimidazole (DRB) or alpha-amanitin were added at the time as CSF-1 removal, the uPA message was stabilised. This was not a general effect on CSF-1 responsive mRNAs, as c-myc mRNA decayed with normal kinetics in the presence of inhibitors. The requirement for ongoing RNA synthesis for the degradation of uPA mRNA in BMM suggests that a component of the degradative pathway may be induced following removal of CSF-1.
authors.affiliation: Centre for Molecular and Cellular Biology, University of Queensland, Brisbane, Australia.
authors.forename: K J
authors.initials: KJ
authors.lastname: Stacey
authors.forename: Y
authors.initials: Y
authors.lastname: Nagamine
authors.forename: D A
authors.initials: DA
authors.lastname: Hume
mesh_terms: D000546:Amanitins / Q000494:pharmacology; D000818:Animals; D001483:Base Sequence; D001853:Bone Marrow; D002454:Cell Differentiation; D003609:Dactinomycin / Q000494:pharmacology; D004004:Dichlororibofuranosylbenzimidazole / Q000494:pharmacology; D004790:Enzyme Induction / Q000187:drug effects; D006801:Humans; D007700:Kinetics; D016173:Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D008264:Macrophages / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides; D012313:RNA / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D012333:RNA, Messenger / Q000378:metabolism*; D011994:Recombinant Proteins / Q000494:pharmacology; D014568:Urokinase-Type Plasminogen Activator / Q000096:biosynthesis*
chemical_list: D000546:Amanitins; D009838:Oligodeoxyribonucleotides; D012333:RNA, Messenger; D011994:Recombinant Proteins; D003609:Dactinomycin; D004004:Dichlororibofuranosylbenzimidazole; D012313:RNA; D016173:Macrophage Colony-Stimulating Factor; D014568:Urokinase-Type Plasminogen Activator