title: HDAC1 regulates the proliferation of radial glial cells in the developing Xenopus tectum.
abstract: In the developing central nervous system (CNS), progenitor cells differentiate into progeny to form functional neural circuits. Radial glial cells (RGs) are a transient progenitor cell type that is present during neurogenesis. It is thought that a combination of neural trophic factors, neurotransmitters and electrical activity regulates the proliferation and differentiation of RGs. However, it is less clear how epigenetic modulation changes RG proliferation. We sought to explore the effect of histone deacetylase (HDAC) activity on the proliferation of RGs in the visual optic tectum of Xenopus laevis. We found that the number of BrdU-labeled precursor cells along the ventricular layer of the tectum decrease developmentally from stage 46 to stage 49. The co-labeling of BrdU-positive cells with brain lipid-binding protein (BLBP), a radial glia marker, showed that the majority of BrdU-labeled cells along the tectal midline are RGs. BLBP-positive cells are also developmentally decreased with the maturation of the brain. Furthermore, HDAC1 expression is developmentally down-regulated in tectal cells, especially in the ventricular layer of the tectum. Pharmacological blockade of HDACs using Trichostatin A (TSA) or Valproic acid (VPA) decreased the number of BrdU-positive, BLBP-positive and co-labeling cells. Specific knockdown of HDAC1 by a morpholino (HDAC1-MO) decreased the number of BrdU- and BLBP-labeled cells and increased the acetylation level of histone H4 at lysine 12 (H4K12). The visual deprivation-induced increase in BrdU- and BLBP-positive cells was blocked by HDAC1 knockdown at stage 49 tadpoles. These data demonstrate that HDAC1 regulates radial glia cell proliferation in the developing optical tectum of Xenopus laevis.
authors: Department of Neurosurgery, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, Jiangsu, 210029, China.
authors: Yi
authors: Y
authors: Tao
authors: Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, Zhejiang, China.
authors: Hangze
authors: H
authors: Ruan
authors: Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, Zhejiang, China.
authors: Xia
authors: X
authors: Guo
authors: Department of Neurosurgery, First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, Jiangsu, 210029, China.
authors: Lixin
authors: L
authors: Li
authors: Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, Zhejiang, China.
authors: Wanhua
authors: W
authors: Shen
mesh_terms: D000107:Acetylation; D000818:Animals; D049109:Cell Proliferation / Q000187:drug effects; D063928:Ependymoglial Cells / Q000187:drug effects / Q000378:metabolism*; D018507:Gene Expression Regulation, Developmental; D056284:Histone Deacetylase 1 / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D006657:Histones / Q000378:metabolism; D006877:Hydroxamic Acids / Q000494:pharmacology; D018613:Microscopy, Confocal; D060172:Morpholinos / Q000378:metabolism; D013477:Superior Colliculi / Q000378:metabolism*; D014635:Valproic Acid / Q000494:pharmacology; D014982:Xenopus laevis / Q000254:growth & development / Q000378:metabolism*
chemical_list: D006657:Histones; D006877:Hydroxamic Acids; D060172:Morpholinos; C012589:trichostatin A; D014635:Valproic Acid; D056284:Histone Deacetylase 1