Ena/VASP proteins regulate cortical neuronal positioning.
Development of the multilayered cerebral cortex involves extensive regulated migration of neurons arising from the deeper germinative layers of the mammalian brain. The anatomy and formation of the cortical layers has been well characterized; however, the underlying molecular mechanisms that control the migration and the final positioning of neurons within the cortex remain poorly understood. Here, we report evidence for a key role of Ena/VASP proteins, a protein family implicated in the spatial control of actin assembly and previously shown to negatively regulate fibroblast cell speeds, in cortical development. Ena/VASP proteins are highly expressed in the developing cortical plate in cells bordering Reelin-expressing Cajal-Retzius cells and in the intermediate zone through which newly born cells migrate. Inhibition of Ena/VASP function through retroviral injections in utero led to aberrant placement of early-born pyramidal neurons in the superficial layers of both the embryonic and the postnatal cortex in a cell-autonomous fashion. The abnormally placed pyramidal neurons exhibited grossly normal morphology and polarity. Our results are consistent with a model in which Ena/VASP proteins function in vivo to control the position of neurons in the mouse neocortex.
Goh
Keow Lin
KL
Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Cai
Li
L
Cepko
Constance L
CL
Gertler
Frank B
FB
D000818:Animals; D002352:Carrier Proteins / Q000096:biosynthesis; D015815:Cell Adhesion Molecules; D002454:Cell Differentiation; D002465:Cell Movement; D002540:Cerebral Cortex / Q000166:cytology* / Q000196:embryology / Q000378:metabolism; D003598:Cytoskeletal Proteins; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D051379:Mice; D008840:Microfilament Proteins; D019579:Neocortex / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D009474:Neurons / Q000166:cytology / Q000502:physiology*; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics; D000091042:Reelin Protein
D002352:Carrier Proteins; D015815:Cell Adhesion Molecules; D003598:Cytoskeletal Proteins; D004268:DNA-Binding Proteins; C092744:ENA-VASP proteins; C102176:Enah protein, mouse; C102177:Evl protein, mouse; D008840:Microfilament Proteins; D011506:Proteins; D000091042:Reelin Protein; C000717128:Reln protein, mouse