Cajal-Retzius cells instruct neuronal migration by coincidence signaling between secreted and contact-dependent guidance cues.
Cajal-Retzius cells instruct neuronal migration by coincidence signaling between secreted and contact-dependent guidance cues.
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DOI:
10.1016/j.neuron.2013.06.040
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发表时间:
2013-08-07
期刊:
影响因子:
16.2
通讯作者:
Müller U
中科院分区:
文献类型:
--
作者:
Gil-Sanz C;Franco SJ;Martinez-Garay I;Espinosa A;Harkins-Perry S;Müller U
Cajal-Retzius (CR) cells are a transient cell population of the CNS that is critical for brain development. In the neocortex, CR cells secrete reelin to instruct the radial migration of projection neurons. It has remained unexplored, however, whether CR cells provide additional molecular cues important for brain development. Here, we show that CR cells express the immunoglobulin-like adhesion molecule nectin1, whereas neocortical projection neurons express its preferred binding partner, nectin3. We demonstrate that nectin1/3-mediated interactions between CR cells and the leading processes of migrating neurons are critical for radial migration. Furthermore, reelin signaling to Rap1 promotes Cdh2 function in neurons via nectin3 and afadin, thus directing the broadly expressed homophilic cell adhesion molecule Cdh2 towards mediating heterotypic cell-cell interactions between neurons and CR cells. Our findings identify nectins/afadin as components of the reelin signaling pathway and demonstrate that coincidence signaling between CR cell-derived secreted and short-range guidance-cues direct neuronal migration.
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