Present address: Institute of Child Health, University College London, UK.
Integrin α5β1 is necessary for regulation of radial migration of cortical neurons during mouse brain development
Version of Record online: 25 JAN 2010
© The Authors (2010). Journal Compilation © Federation of European Neuroscience Societies and Blackwell Publishing Ltd
European Journal of Neuroscience
Volume 31, Issue 3, pages 399–409, February 2010
How to Cite
Marchetti, G., Escuin, S., Van Der Flier, A., De Arcangelis, A., Hynes, R. O. and Georges-Labouesse, E. (2010), Integrin α5β1 is necessary for regulation of radial migration of cortical neurons during mouse brain development. European Journal of Neuroscience, 31: 399–409. doi: 10.1111/j.1460-9568.2009.07072.x
- Issue online: 1 FEB 2010
- Version of Record online: 25 JAN 2010
- Received 15 May 2009, revised 31 October 2009, accepted 22 November 2009
- cell adhesion;
- cerebral cortex;
During cerebral cortex development, post-mitotic neurons interact with radial glial fibers and the extracellular environment to migrate away from the ventricular region and form a correct laminar structure. Integrin receptors are major mediators of cell–cell and cell–extracellular matrix interactions. Several integrin heterodimers are present during formation of the cortical layers. The α5β1 receptor is expressed in the neural progenitors of the ventricular zone during cerebral cortex formation. Using in utero electroporation to introduce short hairpin RNAs in the brain at embryonic day 15.5, we were able to inhibit acutely the expression of α5 integrin in the developing cortex. The knockdown of α5 integrin expression level in neural precursors resulted in an inhibition of radial migration, without perturbing the glial scaffold. Moreover, the same inhibitory effect on neuronal migration was observed after electroporation of a Cre recombinase expression plasmid into the neural progenitors of conditional knockout mice for α5 integrin. In both types of experiments, the electroporated cells expressing reduced levels of α5 integrin accumulated in the premigratory region with an abnormal morphology. At postnatal day 2, ectopic neurons were observed in cortical layer V, while a deficit of neurons was observed in cortical layer II–IV. We show that these neurons do not express a layer V-specific marker, suggesting that they have not undergone premature differentiation. Overall, these results indicate that α5β1 integrin functions in the regulation of neural morphology and migration during cortical development, playing a role in cortical lamination.