TGFβ3 inhibits E-cadherin gene expression in palate medial-edge epithelial cells through a Smad2-Smad4-LEF1 transcription complex

Ali Nawshad, Damian Medici, Chang Chin Liu, Elizabeth D. Hay

Research output: Contribution to journalArticle

107 Scopus citations

Abstract

Dissociation of medial-edge epithelium (MEE) during palate development is essential for mediating correct craniofaciaI morphogenesis. This phenomenon is initiated by TGFβ3 upon adherence of opposing palatal shelves, because loss of E-cadherin causes the MEE seam to break into small epithelial islands. To investigate the molecular mechanisms that cause this E-cadherin loss, we isolated and cultured murine embryonic primary MEE cells from adhered or non-adhered palates. Here, we provide the first evidence that lymphoid enhancer factor 1 (LEF1), when functionally activated by phosphorylated Smad2 (Smad2-P) and Smad4 (rather than β-catenin), binds with the promoter of the E-cadherin gene to repress its transcription in response to TGFP3 signaling. Furthermore, we found that TGFβ3 signaling stimulates epithelial-mesenchymal transformation (EMT) and cell migration in these cells. LEF1 and Smad4 were found to be necessary for up-regulation of the mesenchymal markers vimentin and fibronectin, independently of β-catenin. We proved that TGFβ3 signaling induces EMT in MEE cells by forming activated transcription complexes of Smad2-P, Smad4 and LEF1 that directly inhibit E-cadherin gene expression.

Original languageEnglish (US)
Pages (from-to)1646-1653
Number of pages8
JournalJournal of cell science
Volume120
Issue number9
DOIs
StatePublished - May 1 2007

Keywords

  • E-cadherin
  • Epithelial-m
  • LEF1
  • Smad
  • TGF-beta

ASJC Scopus subject areas

  • Cell Biology

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