Down-regulation Of E-cadherin Is An Essential Event In Activating β-catenin/Tcf Dependent Transcription And Expression Of Its Target Genes In Pdcd4 Knock-down Cells
Qing Wang, Zhen-Xiao Sun, Heike Allgayer, Hsin-Sheng Yang
Published 2010 · Biology, Medicine
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We reported earlier that knockdown of tumor suppressor Pdcd4 (programed cell death 4) downregulates E-cadherin expression and activates β-catenin/Tcf (T-cell factor)-dependent transcription in colon tumor cells. However, the underlying mechanism of these observations remains unknown. In this study, we showed that knockdown of Pdcd4 downregulates E-cadherin expression through elevated protein level of Snail. Over-expression of Pdcd4 upregulates E-cadherin expression and inhibits β-catenin/Tcf-dependent transcription. We then showed that knockdown of E-cadherin activates β-catenin/Tcf-dependent transcription. Conversely, over-expression of E-cadherin in Pdcd4 knockdown cells inhibits β-catenin/Tcf-dependent transcription. In addition, Pdcd4 knockdown stimulates urokinase-type plasminogen activator receptor (u-PAR) and c-Myc expression, whereas u-PAR and c-Myc expression can be reversed by over-expressing E-cadherin in Pdcd4 knockdown cells. Using chromatin immunoprecipitation, we showed that β-catenin/Tcf4 directly binds to the promoters of u-PAR and c-myc in Pdcd4 knockdown cells. Futhermore, knockdown of u-PAR or c-Myc inhibits invasion in Pdcd4 knockdown cells, suggesting that both u-PAR and c-Myc contribute to invasion induced by Pdcd4 knockdown. Taken together, our data showed that elevated Snail expression by Pdcd4 knockdown leads to downregulation of E-cadherin resulting in activating β-catenin/Tcf-dependent transcription and stimulating the expression of c-Myc and u-PAR, thus providing molecular explanation of how Pdcd4 suppresses tumor invasion.
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