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
Müller U
中科院分区:
医学1区
文献类型:
--
作者:
Gil-Sanz C;Franco SJ;Martinez-Garay I;Espinosa A;Harkins-Perry S;Müller U

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Cajal-Retzius(CR)细胞是中枢神经系统的一种短暂细胞群,对大脑发育至关重要。在新皮层,CR细胞分泌reelin来指导投射神经元的径向迁移。然而,CR细胞是否提供了对大脑发育重要的额外分子线索仍然未被探索。在这里,我们表明,CR细胞表达免疫球蛋白样粘附分子nectin 1,而新皮质投射神经元表达其首选的结合伴侣,nectin 3。我们证明,nectin 1/3介导的CR细胞和迁移神经元的主导过程之间的相互作用是至关重要的径向迁移。此外,reelin信号Rap 1促进Cdh 2功能的神经元通过nectin 3和afadin,从而指导广泛表达的嗜同性细胞粘附分子Cdh 2对介导异型细胞间的相互作用的神经元和CR细胞。我们的研究结果确定nectin/afadin作为reelin信号通路的组成部分,并证明CR细胞来源的分泌和短程引导线索之间的重合信号直接神经元迁移。
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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