title: Trichostatin A and structurally related histone deacetylase inhibitors induce 5-lipoxygenase promoter activity.
abstract: 5-Lipoxygenase (5-LO) mRNA expression in Mono Mac 6 cells is induced by the histone deacetylase inhibitor trichostatin A (TsA). In order to study the effects of TsA and several structurally related compounds such as MD85, D237 and M232 on 5-LO promoter activity, we have analyzed the response of a 5-lipoxygenase (5-LO) promoter luciferase reporter gene construct to histone deacetylase inhibitors in transiently transfected Mono Mac 6 and HeLa cells. We show that the activity of 5-LO promoter constructs comprising the sequences -778 to  and of several successive deletions of the 5-LO promoter is strongly increased upon TsA treatment. The data suggest a significant involvement of histone deacetylases in the regulation of 5-LO gene transcription. The basal activity of the 5-LO promoter strongly depends on the presence of multiple Sp1-binding sites (GC-boxes), five of which are positioned in tandem. Deletion of the five tandemized GC-boxes in the 5-LO reporter gene construct revealed that the induction of 5-LO promoter activity by TsA seems to be independent of these GC-boxes. Methylation of 5-LO reporter gene constructs by M.Hpall reduced 5-LO promoter activity but did not prevent induction of promoter activity by TsA, although the activated reporter gene activities were lower compared to the unmethylated plasmid, indicating the dominance of methylation over TsA-sensitive histone deacetylation in silencing of the 5-LO gene. The structure-activity data obtained for histone deacetylase inhibitors suggest that this assay system might serve as a cellular screening tool for the development of HDAC inhibitors.
authors.affiliation: Institute of Pharmaceutical Chemistry, University of Frankfurt, Marie-Curie-Str. 9, D-60439 Frankfurt/Main, Germany.
authors.forename: Niko
authors.initials: N
authors.lastname: Klan
authors.forename: Sabine
authors.initials: S
authors.lastname: Seuter
authors.forename: Nicole
authors.initials: N
authors.lastname: Schnur
authors.forename: Manfred
authors.initials: M
authors.lastname: Jung
authors.forename: Dieter
authors.initials: D
authors.lastname: Steinhilber
mesh_terms: D000818:Animals; D001094:Arachidonate 5-Lipoxygenase / Q000235:genetics* / Q000378:metabolism; D002117:Calcitriol / Q000494:pharmacology; D002460:Cell Line; D018899:CpG Islands / Q000502:physiology; D019175:DNA Methylation; D004791:Enzyme Inhibitors / Q000494:pharmacology*; D020862:GC Rich Sequence / Q000235:genetics; D006367:HeLa Cells; D056572:Histone Deacetylase Inhibitors; D006801:Humans; D006877:Hydroxamic Acids / Q000737:chemistry / Q000494:pharmacology*; D020128:Inhibitory Concentration 50; D008099:Liver / Q000201:enzymology; D011401:Promoter Regions, Genetic / Q000187:drug effects* / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D014158:Transcription, Genetic / Q000187:drug effects / Q000502:physiology; D014162:Transfection; D016212:Transforming Growth Factor beta / Q000494:pharmacology
chemical_list: D004791:Enzyme Inhibitors; D056572:Histone Deacetylase Inhibitors; D006877:Hydroxamic Acids; D012333:RNA, Messenger; D016212:Transforming Growth Factor beta; C012589:trichostatin A; D001094:Arachidonate 5-Lipoxygenase; D002117:Calcitriol