E-cadherin-dependent transcriptional control of apolipoprotein A-IV gene expression in intestinal epithelial cells: a role for the hepatic nuclear factor 4

J Biol Chem. 2006 Feb 10;281(6):3560-8. doi: 10.1074/jbc.M506360200. Epub 2005 Dec 7.

Abstract

Cell-matrix and cell-cell adhesion play a central role in the control of cell proliferation, differentiation, and gene expression. Integrins and E-cadherin are the key components involved in these processes in epithelial cells. We recently showed that integrin-dependent adhesion to the extracellular matrix reinforces the formation of E-cadherin-actin complexes inducing the polarization of Caco-2 enterocytes and increases the expression of a marker of enterocyte differentiation, the apolipoprotein A-IV (apoA-IV) gene. By impairing or enhancing E-cadherin-dependent cell adhesion, we demonstrate in the present study its involvement in the transcriptional activation of the apoA-IV gene in Caco-2 cells. This control requires the regulatory sequence that we have previously identified as necessary and sufficient to drive and restrict apoA-IV gene expression in enterocytes in vivo. Furthermore, using chimeric E-cadherin-Fc homophilic ligand-coated surfaces, we show that a direct activation of E-cadherin triggers the transcriptional activation of the apoA-IV promoter. Finally, E-cadherin-dependent cell-cell adhesion controls the nuclear abundance of the transcription factor hepatic nuclear factor 4alpha, which is involved in the enterocyte-specific expression of apoA-IV gene. Altogether, our results suggest that E-cadherin controls enterocyte-specific expression of genes, such as the apoA-IV gene, through the control of hepatic nuclear factor 4alpha nuclear abundance.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Apolipoproteins A / biosynthesis*
  • Apolipoproteins A / genetics
  • Caco-2 Cells
  • Cadherins / metabolism*
  • Cell Adhesion
  • Cell Line, Tumor
  • Enterocytes / metabolism
  • Epithelial Cells / metabolism*
  • Extracellular Matrix / metabolism
  • Flow Cytometry
  • Gene Expression Regulation*
  • Genes, Reporter
  • Green Fluorescent Proteins / metabolism
  • Hepatocyte Nuclear Factor 4 / metabolism
  • Hepatocyte Nuclear Factor 4 / physiology*
  • Humans
  • Immunoblotting
  • Intestinal Mucosa / metabolism*
  • Ligands
  • Liver / metabolism
  • Luciferases / metabolism
  • Microscopy, Fluorescence
  • Models, Genetic
  • Promoter Regions, Genetic
  • RNA, Messenger / metabolism
  • Recombinant Fusion Proteins / chemistry
  • Reverse Transcriptase Polymerase Chain Reaction
  • Transcription, Genetic*
  • Transcriptional Activation
  • Transfection

Substances

  • Apolipoproteins A
  • Cadherins
  • HNF4A protein, human
  • Hepatocyte Nuclear Factor 4
  • Ligands
  • RNA, Messenger
  • Recombinant Fusion Proteins
  • apolipoprotein A-IV
  • Green Fluorescent Proteins
  • Luciferases