title: SCLIP is crucial for the formation and development of the Purkinje cell dendritic arbor.
abstract: Cerebellar Purkinje cells elaborate one of the most complex dendritic arbors among neurons to integrate the numerous signals they receive from the cerebellum circuitry. Their dendritic differentiation undergoes successive, tightly regulated phases of development involving both regressive and growth events. Although many players regulating the late phases of Purkinje cell dendritogenesis have been identified, intracellular factors controlling earlier phases of dendritic development remain mostly unknown. In this study, we explored the biological properties and functions of SCLIP, a protein of the stathmin family, in Purkinje cell dendritic differentiation and cerebellum development. Unlike the other stathmins, SCLIP is strongly expressed in Purkinje cells during cerebellar development and accumulates in their dendritic processes at a critical period of their formation and outgrowth. To reveal SCLIP functions, we developed a lentiviral-mediated approach on cerebellar organotypic cultures to inhibit or increase its expression in Purkinje cells in their tissue environment. Depletion of SCLIP promoted retraction of the Purkinje cell primitive process and then prevented the formation of new dendrites at early stages of postnatal development. It also prevented their elongation and branching at later phases of differentiation. Conversely, SCLIP overexpression promoted dendritic branching and development. Together, our results demonstrate for the first time that SCLIP is crucial for both the formation and proper development of Purkinje cell dendritic arbors. SCLIP appears thus as a novel and specific factor that controls the early phases of Purkinje cell dendritic differentiation during cerebellum development.
authors.affiliation: Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche 839, UMR7102-Neurobiologie des Processus Adaptatifs, Université Pierre et Marie Curie, Université Paris 06, F-75005 Paris, France.
authors.forename: Fabienne E
authors.initials: FE
authors.lastname: Poulain
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Chauvin
authors.forename: Rosine
authors.initials: R
authors.lastname: Wehrlé
authors.forename: Mathieu
authors.initials: M
authors.lastname: Desclaux
authors.forename: Jacques
authors.initials: J
authors.lastname: Mallet
authors.forename: Guilan
authors.initials: G
authors.lastname: Vodjdani
authors.forename: Isabelle
authors.initials: I
authors.lastname: Dusart
authors.forename: André
authors.initials: A
authors.lastname: Sobel
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D002454:Cell Differentiation / Q000235:genetics / Q000502:physiology*; D002460:Cell Line; D002531:Cerebellum / Q000033:anatomy & histology / Q000196:embryology / Q000254:growth & development* / Q000378:metabolism*; D003712:Dendrites / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D009414:Nerve Growth Factors / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D009924:Organ Culture Techniques; D011689:Purkinje Cells / Q000166:cytology / Q000378:metabolism*; D051381:Rats
chemical_list: D009414:Nerve Growth Factors; C491792:Stmn3 protein, rat