Expression of inappropriate cadherins by epithelial tumor cells promotes endocytosis and degradation of E-cadherin via competition for p120(ctn) - PubMed (original) (raw)
. 2006 Aug 3;25(33):4595-604.
doi: 10.1038/sj.onc.1209396. Epub 2006 Jun 19.
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- PMID: 16786001
- DOI: 10.1038/sj.onc.1209396
Expression of inappropriate cadherins by epithelial tumor cells promotes endocytosis and degradation of E-cadherin via competition for p120(ctn)
M Maeda et al. Oncogene. 2006.
Abstract
Cadherin cell-cell adhesion proteins play an important role in modulating the behavior of tumor cells. E-cadherin serves as a suppressor of tumor cell invasion, and when tumor cells turn on the expression of a non-epithelial cadherin, they often express less E-cadherin, enhancing the tumorigenic phenotype of the cells. Here, we show that when A431 cells are forced to express R-cadherin, they dramatically downregulate the expression of endogenous E- and P-cadherin. In addition, we show that this downregulation is owing to increased turnover of the endogenous cadherins via clathrin-dependent endocytosis. p120(ctn) binds to the juxtamembrane domain of classical cadherins and has been proposed to regulate cadherin adhesive activity. One way p120(ctn) may accomplish this is to serve as a rheostat to regulate the levels of cadherin. Here, we show that the degradation of E-cadherin in response to expression of R-cadherin is owing to competition for p120(ctn).
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- P20-RR018759/RR/NCRR NIH HHS/United States
- P30-CA36727/CA/NCI NIH HHS/United States
- R01-DE12308/DE/NIDCR NIH HHS/United States
- R01-GM51188/GM/NIGMS NIH HHS/United States
- T32-CA09746/CA/NCI NIH HHS/United States
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