title: Retinoic acid receptors inhibit AP1 activation by regulating extracellular signal-regulated kinase and CBP recruitment to an AP1-responsive promoter.
abstract: Retinoids exhibit antineoplastic activities that may be linked to retinoid receptor-mediated transrepression of activating protein 1 (AP1), a heterodimeric transcription factor composed of fos- and jun-related proteins. Here we show that transcriptional activation of an AP1-regulated gene through the mitogen-activated protein kinase (MAPK)-extracellular signal-regulated kinase (ERK) pathway (MAPK(ERK)) is characterized, in intact cells, by a switch from a fra2-junD dimer to a junD-fosB dimer loading on its promoter and by simultaneous recruitment of ERKs, CREB-binding protein (CBP), and RNA polymerase II. All-trans-retinoic acid (atRA) receptor (RAR) was tethered constitutively to the AP1 promoter. AP1 transrepression by retinoic acid was concomitant to glycogen synthase kinase 3 activation, negative regulation of junD hyperphosphorylation, and to decreased RNA polymerase II recruitment. Under these conditions, fra1 loading to the AP1 response element was strongly increased. Importantly, CBP and ERKs were excluded from the promoter in the presence of atRA. AP1 transrepression by retinoids was RAR and ligand dependent, but none of the functions required for RAR-mediated transactivation was necessary for AP1 transrepression. These results indicate that transrepressive effects of retinoids are mediated through a mechanism unrelated to transcriptional activation, involving the RAR-dependent control of transcription factors and cofactor assembly on AP1-regulated promoters.
authors.affiliation: INSERM U 459 and Ligue Nationale Contre le Cancer, Faculté de Médecine Henri Warembourg, 59045 Lille Cedex, France.
authors.forename: Madjid
authors.initials: M
authors.lastname: Benkoussa
authors.forename: Céline
authors.initials: C
authors.lastname: Brand
authors.forename: Marie-Hélène
authors.initials: MH
authors.lastname: Delmotte
authors.forename: Pierre
authors.initials: P
authors.lastname: Formstecher
authors.forename: Philippe
authors.initials: P
authors.lastname: Lefebvre
mesh_terms: D000841:Anisomycin / Q000494:pharmacology; D050882:CREB-Binding Protein; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000187:drug effects / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D019281:Dimerization; D004791:Enzyme Inhibitors / Q000494:pharmacology; D038362:Glycogen Synthase Kinase 3; D038341:Glycogen Synthase Kinases; D006367:HeLa Cells / Q000187:drug effects / Q000528:radiation effects; D006801:Humans; D048369:MAP Kinase Kinase 1; D048670:MAP Kinase Kinase 4; D020929:Mitogen-Activated Protein Kinase Kinases / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D020928:Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D009154:Mutation; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D056971:Nuclear Receptor Co-Repressor 1; D011401:Promoter Regions, Genetic; D017346:Protein Serine-Threonine Kinases / Q000187:drug effects / Q000378:metabolism / Q000528:radiation effects; D018168:Receptors, Retinoic Acid / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D020218:Response Elements; D000072482:Retinoic Acid Receptor alpha; D047488:Retinoid X Receptors; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D015534:Trans-Activators / Q000235:genetics / Q000378:metabolism*; D018808:Transcription Factor AP-1 / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D014157:Transcription Factors / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D014212:Tretinoin / Q000494:pharmacology; D014466:Ultraviolet Rays
chemical_list: D004791:Enzyme Inhibitors; C539127:NCOR1 protein, human; D009687:Nuclear Proteins; D056971:Nuclear Receptor Co-Repressor 1; C000607071:RARA protein, human; D018168:Receptors, Retinoic Acid; D012097:Repressor Proteins; D000072482:Retinoic Acid Receptor alpha; D047488:Retinoid X Receptors; D015534:Trans-Activators; D018808:Transcription Factor AP-1; D014157:Transcription Factors; D014212:Tretinoin; D000841:Anisomycin; D004247:DNA; D050882:CREB-Binding Protein; C494363:CREBBP protein, human; D038341:Glycogen Synthase Kinases; D017346:Protein Serine-Threonine Kinases; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D020928:Mitogen-Activated Protein Kinases; D038362:Glycogen Synthase Kinase 3; D048369:MAP Kinase Kinase 1; D048670:MAP Kinase Kinase 4; C482125:MAP2K1 protein, human; C482559:MAP2K4 protein, human; D020929:Mitogen-Activated Protein Kinase Kinases; D013755:Tetradecanoylphorbol Acetate