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Vol. 39, No. 4, 2007
Issue release date: June 2007
Eur Surg Res 2007;39:208–215
(DOI:10.1159/000101452)

Association of Extracellular Cleavage of E-Cadherin Mediated by MMP-7 with HGF-Induced in vitro Invasion in Human Stomach Cancer Cells

Lee K.H. · Choi E.Y. · Hyun M.S. · Jang B.I. · Kim T.N. · Kim S.W. · Song S.K. · Kim J.H. · Kim J.-R.
Departments of aHemato-Oncology, bEnterology, cGeneral Surgery, and dBiochemistry and Molecular Biology, and eAging-Associated Vascular Disease Research Center, College of Medicine, Yeungnam University, Daegu, Republic of Korea

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Abstract

Background: Proteolytic shedding of the ectodomain of a variety of transmembrane proteins, including cell-to-cell adhesion molecules, has been observed in solid cancers. We have investigated whether extracellular cleavage of E-cadherin mediated by matrix metalloproteinase-7 (MMP-7) is involved in hepatocyte growth factor (HGF) induced in vitro invasion in stomach cancer cells. Methods: The effects of HGF on the expression of E-cadherin/β-catenin and MMP-7 at both the protein and mRNA levels were assessed in stomach cancer cells, NUGC-3 and MKN-28, and in cells in which the expression of MMP-7 was downregulated by transfection with a MMP-7 short hairpin RNA plasmid. Results: Treatment with HGF increased the extracellular cleavage of E-cadherin and the release of MMP-7 and reduced the level of E-cadherin in a dose- and time-dependent manner. HGF treatment repressed the phosphorylation of β-catenin in a Triton-soluble fraction, but enhanced this phosphorylation in a Triton-insoluble fraction. The association of E-cadherin with β-catenin was decreased by HGF treatment in the Triton-soluble fraction. In addition, treatment of MMP-7 short hairpin RNA transfected NUGC-3 cells with HGF resulted in no extracellular cleavage of E-cadherin and also decreased the in vitro cell invasion. Conclusions: These results suggest that incubation with HGF mediated the release of MMP-7, resulting in extracellular cleavage of E-cadherin from stomach cancer cells. This might be a key mechanism in HGF-induced in vitro invasion and metastasis.



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