title: Neuronal differentiation is regulated by leucine-rich acidic nuclear protein (LANP), a member of the inhibitor of histone acetyltransferase complex.
abstract: Neuronal differentiation is a tightly regulated process characterized by temporal and spatial alterations in gene expression. A number of studies indicate a significant role for histone acetylation in the regulation of genes involved in development. Histone acetylation is regulated by histone deacetylases and histone acetyltransferases. Recent findings suggest that these catalytic activities, in turn, are modulated by yet another set of regulators. Of considerable interest in this context is the possible role of the INHAT (inhibitor of histone acetyltransferase) complex, comprised of a group of acidic proteins that suppress histone acetylation by a novel "histone-masking" mechanism. In this study, we specifically examined the role of the leucine-rich acidic nuclear protein (LANP), a defining member of the INHAT complex whose expression is tightly regulated in neuronal development. We report that depleting LANP in neuronal cell lines promotes neurite outgrowth by inducing changes in gene expression. In addition, we show that LANP directly regulates expression of the neurofilament light chain, an important neuron-specific cytoskeletal gene, by binding to the promoter of this gene and modulating histone acetylation levels. Finally, we corroborated our findings in vivo by demonstrating increased neurite outgrowth in primary neurons obtained from LANP null mice, which is also accompanied by increased histone acetylation at the NF-L promoter. Taken together, these results implicate INHATs as a distinct class of developmental regulators involved in the epigenetic modulation of neuronal differentiation.
authors.affiliation: Davee Department of Neurology and Department of Cell and Molecular Biology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA.
authors.forename: Rupinder K
authors.initials: RK
authors.lastname: Kular
authors.forename: Marija
authors.initials: M
authors.lastname: Cvetanovic
authors.forename: Steve
authors.initials: S
authors.lastname: Siferd
authors.forename: Ameet R
authors.initials: AR
authors.lastname: Kini
authors.forename: Puneet
authors.initials: P
authors.lastname: Opal
mesh_terms: D000107:Acetylation; D000818:Animals; D002454:Cell Differentiation / Q000502:physiology*; D004791:Enzyme Inhibitors / Q000378:metabolism*; D044127:Epigenesis, Genetic / Q000502:physiology; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism; D006657:Histones / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D008817:Mice, Mutant Strains; D016900:Neurofilament Proteins / Q000096:biosynthesis / Q000235:genetics; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D016716:PC12 Cells; D011401:Promoter Regions, Genetic / Q000502:physiology; D051381:Rats
chemical_list: C490338:Anp32a protein, rat; D004791:Enzyme Inhibitors; D056572:Histone Deacetylase Inhibitors; D006657:Histones; D016900:Neurofilament Proteins; D009687:Nuclear Proteins; C044882:neurofilament protein L; D006655:Histone Deacetylases