Reelin controls neuronal positioning by promoting cell-matrix adhesion via inside-out activation of integrin α5β1.

Reelin controls neuronal positioning by promoting cell-matrix adhesion via inside-out activation of integrin α5β1.
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DOI:
10.1016/j.neuron.2012.07.020
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发表时间:
2012-10-18
期刊:
影响因子:
16.2
通讯作者:
Nakajima K
Nakajima K
中科院分区:
医学1区
文献类型:
--
作者:
Sekine K;Kawauchi T;Kubo K;Honda T;Herz J;Hattori M;Kinashi T;Nakajima K

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出生日期相关的神经元分层是新皮层功能的基础。细胞外蛋白Reelin对最终神经元排列的建立至关重要。尽管这种依赖Reelin的神经元分层主要是通过边缘区(MZ)下被称为“终端易位”的最后神经元迁移步骤建立的,但Reelin控制终端易位和层形成的分子机制在很大程度上是未知的。在这里,我们发现在Reelin与其受体结合后,它通过细胞内Dab1-Crk/CrkL-C3G-Rap1途径激活整合素α5β1。这种细胞内通路是终末易位所必需的,Reelin信号的激活通过整合素α5β1促进神经元对纤维连接蛋白的粘附。由于纤维连接蛋白定位于MZ,激活的整合素α5β1控制末端易位,从而介导成熟皮层中适当的神经元排列。这些数据表明,依赖reelin的神经元粘附细胞外基质的激活对于最终的出生日期依赖的新皮层分层至关重要。
Birth-date-dependent neuronal layering is fundamental to neocortical functions. The extracellular protein Reelin is essential for the establishment of the eventual neuronal alignments. Although this Reelin-dependent neuronal layering is mainly established by the final neuronal migration step called “terminal translocation” beneath the marginal zone (MZ), the molecular mechanism underlying the control by Reelin of terminal translocation and layer formation is largely unknown. Here, we show that after Reelin binds to its receptors, it activates integrin α5β1 through the intracellular Dab1-Crk/CrkL-C3G-Rap1 pathway. This intracellular pathway is required for terminal translocation and the activation of Reelin signaling promotes neuronal adhesion to fibronectin through integrin α5β1. Since fibronectin is localized in the MZ, the activated integrin α5β1 then controls terminal translocation, which mediates proper neuronal alignments in the mature cortex. These data indicate that Reelin-dependent activation of neuronal adhesion to the extracellular matrix is crucial for the eventual birth-date-dependent layeringof the neocortex.
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