Beta-catenin signaling involves HGF-enhanced HepG2 scattering through activating MMP-7 transcription

Histochem Cell Biol. 2010 Sep;134(3):285-95. doi: 10.1007/s00418-010-0729-3. Epub 2010 Jul 31.

Abstract

It is well accepted that cell scattering (dispersion of clustered cells into single cells) is the initial step of tumor metastasis, and the downregulation of E-cadherin is associated with metastatic potential of tumor cells; however, the molecular mechanisms underlying loss of E-cadherin during tumor development are still poorly understood. Here, we report that hepatocyte growth factor (HGF) induced E-cadherin downregulation and cell scattering are attributed to the activation of Wnt/beta-catenin signaling and transcriptional activation of matrix metalloproteinase MMP-7. Furthermore, the increased MMP-7 is secreted into the medium and cleaves the ectodomain of E-cadherin. Inhibition of HGF signal by siRNA of c-Met, blocking the beta-catenin transcriptional activity through a dominant negative form of TCF4, MMP-7 knockdown by siRNA or suppression of MMP-7 enzymatic activity with a neutralization antibody allowed inhibition of HGF-induced loss of E-cadherin and HepG2 scattering. Our data presented here revealed the intrinsic mechanism of HGF activated Wnt/beta-catenin signaling regulation of HepG2 cell scattering through MMP-7 transcription activation and E-cadherin degradation. The results suggest that the blocking of HGF/c-Met/beta-catenin/MMP-7/E-cadherin signaling pathway might present a practical therapeutic target for interference with hepatocellular carcinoma metastasis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cadherins / biosynthesis*
  • Down-Regulation
  • Enzyme Activation
  • Hep G2 Cells
  • Hepatocyte Growth Factor / physiology*
  • Humans
  • Matrix Metalloproteinase 7 / metabolism*
  • Neoplasm Invasiveness / physiopathology
  • Neoplasm Metastasis / physiopathology
  • Proto-Oncogene Proteins c-met / physiology
  • Signal Transduction / drug effects
  • Wnt Proteins / physiology
  • beta Catenin / physiology*

Substances

  • Cadherins
  • Wnt Proteins
  • beta Catenin
  • Hepatocyte Growth Factor
  • Proto-Oncogene Proteins c-met
  • Matrix Metalloproteinase 7