Requirement of ZO-1 for the formation of belt-like adherens junctions during epithelial cell polarization

Junichi Ikenouchi, Kazuaki Umeda, Sachiko Tsukita, Mikio Furuse, Shoichiro Tsukita

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

The molecular mechanisms of how primordial adherens junctions (AJs) evolve into spatially separated belt-like AJs and tight junctions (TJs) during epithelial polarization are not well understood. Previously, we reported the establishment of ZO-1/ZO-2-deficient cultured epithelial cells (1[ko]/2[kd] cells), which lacked TJs completely. In the present study, we found that the formation of belt-like AJs was significantly delayed in 1(ko)/2(kd) cells during epithelial polarization. The activation of Rac1 upon primordial AJ formation is severely impaired in 1(ko)/2(kd) cells. Our data indicate that ZO-1 plays crucial roles not only in TJ formation, but also in the conversion from "fi broblastic" AJs to belt-like "polarized epithelial" AJs through Rac1 activation. Furthermore, to examine whether ZO-1 itself mediate belt-like AJ and TJ formation, respectively, we performed a mutational analysis of ZO-1. The requirement for ZO-1 differs between belt-like AJ and TJ formation. We propose that ZO-1 is directly involved in the establishment of two distinct junctional domains, belt-like AJs and TJs, during epithelial polarization.

Original languageEnglish
Pages (from-to)779-786
Number of pages8
JournalJournal of Cell Biology
Volume176
Issue number6
DOIs
Publication statusPublished - Mar 12 2007
Externally publishedYes

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Adherens Junctions
Tight Junctions
Epithelial Cells
Cultured Cells

All Science Journal Classification (ASJC) codes

  • Cell Biology

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Requirement of ZO-1 for the formation of belt-like adherens junctions during epithelial cell polarization. / Ikenouchi, Junichi; Umeda, Kazuaki; Tsukita, Sachiko; Furuse, Mikio; Tsukita, Shoichiro.

In: Journal of Cell Biology, Vol. 176, No. 6, 12.03.2007, p. 779-786.

Research output: Contribution to journalArticle

Ikenouchi, Junichi ; Umeda, Kazuaki ; Tsukita, Sachiko ; Furuse, Mikio ; Tsukita, Shoichiro. / Requirement of ZO-1 for the formation of belt-like adherens junctions during epithelial cell polarization. In: Journal of Cell Biology. 2007 ; Vol. 176, No. 6. pp. 779-786.
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