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Proc Natl Acad Sci U S A. 2017 Feb 21;114(8):2048-2053. doi: 10.1073/pnas.1615215114. Epub 2017 Feb 7.

Reelin transiently promotes N-cadherin-dependent neuronal adhesion during mouse cortical development.

Author information

1
Department of Anatomy, Keio University School of Medicine, Shinjuku-ku, Tokyo 160-8582, Japan.
2
Faculty of Mathematics, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan.
3
Department of Anatomy and Cell Biology, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya 466-8550, Japan.
4
Department of Anatomy and Cell Biology, Kyushu University Graduate School of Medical Sciences, Higashi-ku, Fukuoka 812-8582, Japan.
5
Department of Anatomy, Keio University School of Medicine, Shinjuku-ku, Tokyo 160-8582, Japan; kazunori@keio.jp.

Abstract

Reelin is an essential glycoprotein for the establishment of the highly organized six-layered structure of neurons of the mammalian neocortex. Although the role of Reelin in the control of neuronal migration has been extensively studied at the molecular level, the mechanisms underlying Reelin-dependent neuronal layer organization are not yet fully understood. In this study, we directly showed that Reelin promotes adhesion among dissociated neocortical neurons in culture. The Reelin-mediated neuronal aggregation occurs in an N-cadherin-dependent manner, both in vivo and in vitro. Unexpectedly, however, in a rotation culture of dissociated neocortical cells that gradually reaggregated over time, we found that it was the neural progenitor cells [radial glial cells (RGCs)], rather than the neurons, that tended to form clusters in the presence of Reelin. Mathematical modeling suggested that this clustering of RGCs could be recapitulated if the Reelin-dependent promotion of neuronal adhesion were to occur only transiently. Thus, we directly measured the adhesive force between neurons and N-cadherin by atomic force microscopy, and found that Reelin indeed enhanced the adhesiveness of neurons to N-cadherin; this enhanced adhesiveness began to be observed at 30 min after Reelin stimulation, but declined by 3 h. These results suggest that Reelin transiently (and not persistently) promotes N-cadherin-mediated neuronal aggregation. When N-cadherin and stabilized β-catenin were overexpressed in the migrating neurons, the transfected neurons were abnormally distributed in the superficial region of the neocortex, suggesting that appropriate regulation of N-cadherin-mediated adhesion is important for correct positioning of the neurons during neocortical development.

KEYWORDS:

N-cadherin; Reelin; aggregation; corticogenesis; neuronal migration

PMID:
28174271
PMCID:
PMC5338414
DOI:
10.1073/pnas.1615215114
[Indexed for MEDLINE]
Free PMC Article

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