title: KIF1A inhibition immortalizes brain stem cells but blocks BDNF-mediated neuronal migration.
abstract: Brain neural stem cells (radial glial progenitors, RGPs) undergo a mysterious form of cell cycle-entrained interkinetic nuclear migration (INM) that is driven apically by cytoplasmic dynein and basally by the kinesin KIF1A, which has recently been implicated in human brain developmental disease. To understand the consequences of altered basal INM and the roles of KIF1A in disease, we performed constitutive and conditional RNAi and expressed mutant KIF1A in E16 to P7 rat RGPs and neurons. RGPs inhibited in basal INM still showed normal cell cycle progression, although neurogenic divisions were severely reduced. Postmitotic neuronal migration was independently disrupted at the multipolar stage and accompanied by premature ectopic expression of neuronal differentiation markers. Similar effects were unexpectedly observed throughout the layer of surrounding control cells, mimicked by Bdnf (brain-derived neurotrophic factor) or Dcx RNAi, and rescued by BDNF application. These results identify sequential and independent roles for KIF1A and provide an important new approach for reversing the effects of human disease.
authors.affiliation: Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.
authors.forename: Aurelie
authors.identifier: http://orcid.org/0000-0003-2509-7198
authors.initials: A
authors.lastname: Carabalona
authors.affiliation: Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.
authors.forename: Daniel Jun-Kit
authors.initials: DJ
authors.lastname: Hu
authors.affiliation: Department of Pathology and Cell Biology, Columbia University, New York, New York, USA.
authors.forename: Richard B
authors.initials: RB
authors.lastname: Vallee
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation / Q000378:metabolism; D019208:Brain-Derived Neurotrophic Factor / Q000037:antagonists & inhibitors* / Q000494:pharmacology*; D002453:Cell Cycle / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D000089662:Doublecortin Protein; D005260:Female; D006801:Humans; D016547:Kinesins / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D008938:Mitosis / Q000187:drug effects; D058953:Neural Stem Cells / Q000187:drug effects*; D009474:Neurons / Q000187:drug effects*; D011247:Pregnancy; D034622:RNA Interference; D051381:Rats; D017207:Rats, Sprague-Dawley; D014162:Transfection
chemical_list: D000943:Antigens, Differentiation; D019208:Brain-Derived Neurotrophic Factor; C000714848:Dcx protein, rat; D000089662:Doublecortin Protein; C094065:KIF1A protein, human; C490575:Kif1a protein, rat; D016547:Kinesins