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- W2107695860 abstract "Endocrine therapy resistant (ETR) tumors often display mesenchymal features, associated with aggressive and enhanced motility behaviour. Notch signalling is over-activated in ETR cells. By blocking it, it is possible to interfere with the cell growth. Notch is also implicated in regulating epithelial to mesenchymal transition (EMT) affecting both migration and invasion in breast cancer cells. We know that Nicastrin is the major component of the multi-subunit protease complex Gamma Secretase (GS) which executes intramembrane proteolysis of integral proteins such Notch. We used two models of Endocrine Therapy Resistant MCF7 breast cancer cell lines which acquired EMT feature and showed higher levels of Nicastrin and Notch targets. Moreover, they displayed higher Notch4 levels but lower Notch1 and Notch2, indicating a possible switch of the Notch signalling when cells acquire resistance. We demonstrated that Gamma Secretase inhibitor PF03084014 and anti-Nicastrin MAbs were particularly effective in partially inhibiting the EMT process by blocking Nicastrin-Notch4 contribution to resistance. Importantly, we also demonstrated that the stem cells-like population was reduced upon these treatments. Both Nicastrin and Notch4 genetic silencing lead to similar effects. Finally, stably overexpressing Nicastrin, was sufficient to activate Notch4 in MCF7 and render them unresponsive to tamoxifen. Here we highlight our recent study." @default.
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- W2107695860 date "2014-10-23" @default.
- W2107695860 modified "2023-09-24" @default.
- W2107695860 title "Endocrine therapy resistance and epithelial to mesenchymal transition are driven by Nicastrin and Notch4 cooperation in MCF7 breast cancer cells" @default.
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- W2107695860 doi "https://doi.org/10.14800/ccm.356" @default.
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