A phosphatidylinositol lipids system, lamellipodin, and Ena/VASP regulate dynamic morphology of multipolar migrating cells in the developing cerebral cortex

Satoshi Yoshinaga, Takahiro Ohkubo, Shinji Sasaki, Mutsuo Nuriya, Yukino Ogawa, Masato Yasui, Hidenori Tabata, Kazunori Nakajima

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

In the developing mammalian cerebral cortex, excitatory neurons are generated in the ventricular zone (VZ) and subventricular zone; these neurons migrate toward the pial surface. The neurons generated in theVZassume a multipolar morphology and remain in a narrow region called the multipolar cell accumulation zone (MAZ) for~24 h, in which they extend and retract multiple processes dynamically. They eventually extend an axon tangentially and begin radial migration using a migratory mode called locomotion. Despite the potential biological importance of the process movement of multipolar cells, the molecular mechanisms remain to be elucidated. Here, we observed that the processes of mouse multipolar cells were actin rich and morphologically resembled the filopodia and lamellipodia in growth cones; thus, we focused on the actin-remodeling proteins Lamellipodin (Lpd) and Ena/vasodilator-stimulated phosphoprotein (VASP). Lpd binds to phosphatidylinositol (3,4)-bisphosphate [PI(3,4)P2] and recruits Ena/VASP, which promotes the assembly of actin filaments, to the plasma membranes. In situ hybridization and immunohistochemistry revealed that Lpd is expressed in multipolar cells in the MAZ. The functional silencing of either Lpd or Ena/VASP decreased the number of primary processes. Immunostaining and a Förster resonance energy transfer analysis revealed the subcellular localization of PI(3,4)P2 at the tips of the processes. A knockdown experiment and treatment with an inhibitor for Src homology 2-containing inositol phosphatase-2, a 5-phosphatase that produces PI(3,4)P2 from phosphatidylinositol (3,4,5)-triphosphate, decreased the number of primary processes. Our observations suggest that PI(3,4)P2, Lpd, and Ena/VASP are involved in the process movement of multipolar migrating cells.

Original languageEnglish
Pages (from-to)11643-11656
Number of pages14
JournalJournal of Neuroscience
Volume32
Issue number34
DOIs
Publication statusPublished - 2012 Aug 22

ASJC Scopus subject areas

  • Neuroscience(all)

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