Periderm cells covering palatal shelves have tight junctions and their desquamation reduces the polarity of palatal shelf epithelial cells in palatogenesis

Midori Yoshida, Yohei Shimono, Hideru Togashi, Kiyomi Matsuzaki, Jun Miyoshi, Akira Mizoguchi, Takahide Komori, Yoshimi Takai

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In palatogenesis, bilateral palatal shelves grow and fuse with each other to establish mesenchyme continuity across the horizontal palate. The palatal shelves are covered with the medial edge epithelium (MEE) in which most apical cells are periderm cells. We investigated localization and roles of tight junction (TJ) and adherens junction (AJ) components and an apical membrane marker in the MEE in palatogenesis. Immunofluorescence and immunoelectron microscopy analyses revealed that TJs were located at the boundary between neighboring periderm cells, whereas AJ components were localized at the boundary between all epithelial cells in the MEE. Specifically, typical AJs were observed at the boundaries between neighboring periderm cells and between periderm cells and underlying epithelial cells where the signal for nectin-1 was observed. The TGF-β-induced desquamation of periderm cells reduced the polarity of remaining epithelial cells as estimated by changes of epithelial cell morphology and the staining of the polarity marker and the AJ components. These less polarized epithelial cells then intermingled and finally disappeared at least partly by apoptosis. These results indicate that periderm cells covering growing palatal shelves have bona fide TJs and their desquamation reduces the polarity of palatal shelf epithelial cells in palatogenesis.

Original languageEnglish
Pages (from-to)455-472
Number of pages18
JournalGenes to Cells
Volume17
Issue number6
DOIs
Publication statusPublished - 06-2012

All Science Journal Classification (ASJC) codes

  • Genetics
  • Cell Biology

Fingerprint Dive into the research topics of 'Periderm cells covering palatal shelves have tight junctions and their desquamation reduces the polarity of palatal shelf epithelial cells in palatogenesis'. Together they form a unique fingerprint.

Cite this