TAG-1-assisted progenitor elongation streamlines nuclear migration to optimize subapical crowding

Mayumi Okamoto, Takashi Namba, Tomoyasu Shinoda, Takefumi Kondo, Tadashi Watanabe, Yasuhiro Inoue, Kosei Takeuchi, Yukiko Enomoto, Kumiko Ota, Kanako Oda, Yoshino Wada, Ken Sagou, Kanako Saito, Akira Sakakibara, Ayano Kawaguchi, Kazunori Nakajima, Taiji Adachi, Toshihiko Fujimori, Masahiro Ueda, Shigeo HayashiKozo Kaibuchi, Takaki Miyata

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50 Citations (Scopus)

Abstract

Neural progenitors exhibit cell cycle-dependent interkinetic nuclear migration (INM) along the apicobasal axis. Despite recent advances in understanding its underlying molecular mechanisms, the processes to which INM contributes mechanically and the regulation of INM by the apicobasally elongated morphology of progenitors remain unclear. We found that knockdown of the cell-surface molecule TAG-1 resulted in retraction of neocortical progenitors' basal processes. Highly shortened stem-like progenitors failed to undergo basalward INM and became overcrowded in the periventricular (subapical) space. Surprisingly, the overcrowded progenitors left the apical surface and migrated into basal neuronal territories. These observations, together with the results of in toto imaging and physical tests, suggest that progenitors may sense and respond to excessive mechanical stress. Although, unexpectedly, the heterotopic progenitors remained stem-like and continued to sequentially produce neurons until the late embryonic period, histogenesis was severely disrupted. Thus, INM is essential for preventing overcrowding of nuclei and their somata, thereby ensuring normal brain histogenesis.

Original languageEnglish
Pages (from-to)1556-1566
Number of pages11
JournalNature Neuroscience
Volume16
Issue number11
DOIs
Publication statusPublished - 2013 Nov

ASJC Scopus subject areas

  • Neuroscience(all)

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    Okamoto, M., Namba, T., Shinoda, T., Kondo, T., Watanabe, T., Inoue, Y., Takeuchi, K., Enomoto, Y., Ota, K., Oda, K., Wada, Y., Sagou, K., Saito, K., Sakakibara, A., Kawaguchi, A., Nakajima, K., Adachi, T., Fujimori, T., Ueda, M., ... Miyata, T. (2013). TAG-1-assisted progenitor elongation streamlines nuclear migration to optimize subapical crowding. Nature Neuroscience, 16(11), 1556-1566. https://doi.org/10.1038/nn.3525