title: Neuronal activity controls Bdnf expression via Polycomb de-repression and CREB/CBP/JMJD3 activation in mature neurons.
abstract: It has been recently described that in embryonic stem cells, the expression of some important developmentally regulated genes is repressed, but poised for fast activation under the appropriate stimuli. In this work we show that Bdnf promoters are repressed by Polycomb Complex 2 in mature hippocampal neurons, and basal expression is guaranteed by the coexistence with activating histone marks. Neuronal stimulation triggered by N-methyl-D-aspartate application induces the transcription of these promoters by H3K27Me3 demethylation and H3K27Me3 phosphorylation at Serine 28 leading to displacement of EZH2, the catalytic subunit of Polycomb Repressor Complex 2. Our data show that the fast transient expression of Bdnf promoters II and VI after neuronal stimulation is dependent on acetylation of histone H3K27 by CREB-p/CBP. Thus, regulatory mechanisms established during development seem to remain after differentiation controlling genes induced by different stimuli, as would be the case of early memory genes in mature neurons.
authors.affiliation: Departamento de Neurobiología Molecular, Centro Biología Molecular 'Severo Ochoa' CSIC-UAM, 28049 Madrid, Spain.
authors.forename: Ernest
authors.initials: E
authors.lastname: Palomer
authors.affiliation: Departamento de Neurobiología Molecular, Centro Biología Molecular 'Severo Ochoa' CSIC-UAM, 28049 Madrid, Spain.
authors.forename: Javier
authors.initials: J
authors.lastname: Carretero
authors.affiliation: Departamento de Neurobiología Molecular, Centro Biología Molecular 'Severo Ochoa' CSIC-UAM, 28049 Madrid, Spain.
authors.forename: Stefano
authors.initials: S
authors.lastname: Benvegnù
authors.affiliation: Departamento de Neurobiología Molecular, Centro Biología Molecular 'Severo Ochoa' CSIC-UAM, 28049 Madrid, Spain.
authors.forename: Carlos G
authors.initials: CG
authors.lastname: Dotti
authors.affiliation: Departamento de Neurobiología Molecular, Centro Biología Molecular 'Severo Ochoa' CSIC-UAM, 28049 Madrid, Spain.|Laboratorio de Neurobiología, Instituto de Investigaciones Médicas Mercedes y Martín Ferreyra (INIMEC-CONICET-UNC), Universidad Nacional de Córdoba, 5016 Córdoba, Argentina.
authors.forename: Mauricio G
authors.initials: MG
authors.lastname: Martin
mesh_terms: D000107:Acetylation / Q000187:drug effects; D000818:Animals; D019208:Brain-Derived Neurotrophic Factor / Q000235:genetics* / Q000378:metabolism; D050882:CREB-Binding Protein / Q000378:metabolism*; D002454:Cell Differentiation; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism*; D000071221:Enhancer of Zeste Homolog 2 Protein; D044127:Epigenesis, Genetic / Q000187:drug effects; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D006624:Hippocampus / Q000166:cytology; D006657:Histones / Q000378:metabolism; D056484:Jumonji Domain-Containing Histone Demethylases / Q000378:metabolism*; D036881:Long-Term Synaptic Depression / Q000187:drug effects; D008239:Lysine / Q000378:metabolism; D008745:Methylation / Q000187:drug effects; D008954:Models, Biological; D016202:N-Methylaspartate / Q000494:pharmacology; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D010766:Phosphorylation / Q000187:drug effects; D063151:Polycomb Repressive Complex 2 / Q000378:metabolism; D063146:Polycomb-Group Proteins / Q000378:metabolism*; D011401:Promoter Regions, Genetic / Q000235:genetics; D017208:Rats, Wistar
chemical_list: D019208:Brain-Derived Neurotrophic Factor; D017362:Cyclic AMP Response Element-Binding Protein; D006657:Histones; D063146:Polycomb-Group Proteins; D016202:N-Methylaspartate; D056484:Jumonji Domain-Containing Histone Demethylases; C000655037:Kdm6b protein, rat; C578253:EZH2 protein, rat; D000071221:Enhancer of Zeste Homolog 2 Protein; D063151:Polycomb Repressive Complex 2; D050882:CREB-Binding Protein; D008239:Lysine