title: Histone deacetylase 3 (HDAC3) is recruited to target promoters by PML-RARalpha as a component of the N-CoR co-repressor complex to repress transcription in vivo.
abstract: PML-RARalpha is a chimeric transcription factor tightly associated with acute promyelocytic leukemia. PML-RARalpha plays an important role in the aberrant transcription repression on the target genes of wild-type retinoic acid receptors. Here, we demonstrated that HDAC3, one component of the N-CoR transcription repressor complex, is a key regulator of the transcription repression by PML-RARalphain vivo. Using immunoprecipitation, we demonstrated that PML-RARalpha interacts with N-CoR/HDAC3 in vivo without ligand. Next, using chromatin immunoprecipitation (ChIP) assay, this N-CoR/HDAC3 co-repressor complex was recruited to the endogenous target promoters (RARbeta and CYP26) through PML-RARalpha. The neighboring histones were de-acetylated and gene expression was repressed. When HDAC3 protein was knocked down by RNA interference in PML-RARalpha-expressing cells, the endogenous target genes were significantly activated, which was also confirmed by promoter-luciferase reporter assay. These results provide evidence to show that the N-CoR/HDAC3 co-repressor complex is involved in the aberrant transcription regulation in PML-RARalpha-expressing cells.
authors.affiliation: Department of Hematology, Nagoya University Graduate School of Medicine, Showa-ku, Japan.
authors.forename: Akihide
authors.initials: A
authors.lastname: Atsumi
authors.forename: Akihiro
authors.initials: A
authors.lastname: Tomita
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kiyoi
authors.forename: Tomoki
authors.initials: T
authors.lastname: Naoe
mesh_terms: D001483:Base Sequence; D002460:Cell Line; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics; D005786:Gene Expression Regulation; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D047468:Immunoprecipitation; D008024:Ligands; D008156:Luciferases / Q000235:genetics / Q000378:metabolism; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D056971:Nuclear Receptor Co-Repressor 1; D015514:Oncogene Proteins, Fusion / Q000235:genetics / Q000378:metabolism*; D010957:Plasmids / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011485:Protein Binding; D018168:Receptors, Retinoic Acid / Q000235:genetics; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism*; D000072516:Retinoic Acid 4-Hydroxylase; D000072482:Retinoic Acid Receptor alpha; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014158:Transcription, Genetic / Q000235:genetics*; D014162:Transfection; D000099186:Histone Deacetylase 3
chemical_list: D003577:Cytochrome P-450 Enzyme System; D006655:Histone Deacetylases; D008024:Ligands; D008156:Luciferases; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D056971:Nuclear Receptor Co-Repressor 1; D015514:Oncogene Proteins, Fusion; D018168:Receptors, Retinoic Acid; D011993:Recombinant Fusion Proteins; D012097:Repressor Proteins; D000072516:Retinoic Acid 4-Hydroxylase; D000072482:Retinoic Acid Receptor alpha; D000099186:Histone Deacetylase 3; C539127:NCOR1 protein, human; C000607071:RARA protein, human; C093476:promyelocytic leukemia-retinoic acid receptor alpha fusion oncoprotein