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. 1996 Dec 2;135(6):1643–1654. doi: 10.1083/jcb.135.6.1643

Expression of N-cadherin by human squamous carcinoma cells induces a scattered fibroblastic phenotype with disrupted cell-cell adhesion

PMCID: PMC2133960  PMID: 8978829

Abstract

E-cadherin is a transmembrane glycoprotein that mediates calcium- dependent, homotypic cell-cell adhesion and plays an important role in maintaining the normal phenotype of epithelial cells. Disruption of E- cadherin activity in epithelial cells correlates with formation of metastatic tumors. Decreased adhesive function may be implemented in a number of ways including: (a) decreased expression of E-cadherin; (b) mutations in the gene encoding E-cadherin; or (c) mutations in the genes that encode the catenins, proteins that link the cadherins to the cytoskeleton and are essential for cadherin mediated cell-cell adhesion. In this study, we explored the possibility that inappropriate expression of a nonepithelial cadherin by an epithelial cell might also result in disruption of cell-cell adhesion. We showed that a squamous cell carcinoma-derived cell line expressed N-cadherin and displayed a scattered fibroblastic phenotype along with decreased expression of E- and P-cadherin. Transfection of this cell line with antisense N- cadherin resulted in reversion to a normal-appearing squamous epithelial cell with increased E- and P-cadherin expression. In addition, transfection of a normal-appearing squamous epithelial cell line with N-cadherin resulted in downregulation of both E- and P- cadherin and a scattered fibroblastic phenotype. In all cases, the levels of expression of N-cadherin and E-cadherin were inversely related to one another. In addition, we showed that some squamous cell carcinomas expressed N-cadherin in situ and those tumors expressing N- cadherin were invasive. These studies led us to propose a novel mechanism for tumorigenesis in squamous epithelial cells; i.e., inadvertent expression of a nonepithelial cadherin.

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Selected References

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