Inducible expression of p120Cas1B isoform corroborates the role for p120-catenin as a positive regulator of E-cadherin function in intestinal cancer cells

Biochemical and Biophysical Research Communications
Santiago Roura, David Domínguez

Abstract

Over the past decade, the exact function of p120-catenin in regulation of E-cadherin/catenins complex has remained particularly controversial. We have previously reported that E-cadherin-mediated adhesion is tightly regulated by tyrosine phosphorylation of catenins. However, this effect is not observed in human colon carcinoma cell line Caco-2. Here, we have generated inducible Caco-2 clones that display p120Cas1B, a p120-catenin isoform poorly expressed by these cells. As a result, neither expression of the transgene nor tyrosine phosphorylation of catenins induces redistribution of E-cadherin to the cytosol and disassembly of adherens and tight junctions. In contrast, E-cadherin appears markedly increased reinforcing cell-cell adhesion. Interestingly, a substantial decrease in p120-catenin levels is found in MDCK cells expressing Snail, in which E-cadherin expression is strongly inhibited. Additionally, we show that the specific depletion of p120-catenin decreases cell-cell contacts, and increases cell motility and scattering of colonies established by HT-29 M6 cells. Together our results corroborate that p120-catenin plays an essential role in the maintenance of the required E-cadherin protein levels that prevent the loss of...Continue Reading

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Citations

Jan 7, 2011·PloS One·Robert H CarnahanAlbert B Reynolds
Jun 3, 2014·BMC Cancer·Björn Ldm Brücher, Ijaz S Jamall
Feb 13, 2010·Journal of Cancer Research and Clinical Oncology·K TalvinenP Kronqvist

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