Abstract
Nicastrin is an essential component of the gamma secretase (GS) enzyme complex, required for its synthesis and recognition of substrates for proteolytic cleavage. The purpose of this study was to investigate whether nicastrin has prognostic value or potential as a therapeutic target in breast cancer (BC). The suitability of nicastrin as a target in BC was assessed using BC tissue microarrays (TMAs) (n = 1050), and its biological role in vitro was evaluated in BC cell lines following gene silencing. Nicastrin blocking antibodies were developed and evaluated for their suitability as potential clinical therapeutics. TMA and cell line analysis confirmed that nicastrin expression was upregulated in BC compared to normal breast cells. In TMA patient samples, high nicastrin expression was observed in 47.5% of cases and correlated with ERα expression, patient age, and tumor grade. In pre-defined subset analysis, high nicastrin expression predicted for worse BC specific survival in the ERα −ve cohort. In vitro gene silencing of nicastrin resulted in disruption of the GS complex and a decrease in notch1 cleavage. This was sufficient to increase E-cadherin expression and its co-localization with p120 catenin at cell–cell junctions in MCF7 cells. Nicastrin silencing in invasive MDA-MB-231 cells resulted in loss of vimentin expression and a marked reduction in both cell motility and invasion; which was concomitant with the de novo formation of cell–cell junctions characterized by the colocalization of p120 catenin and F-actin. These data indicate that nicastrin can function to maintain epithelial to mesenchymal transition during BC progression. Anti-nicastrin polyclonal and monoclonal antibodies were able to decrease notch1 and vimentin expression and reduced the invasive capacity of BC cells in vitro. This supports our hypothesis that a nicastrin blocking antibody could be used to limit metastatic dissemination in invasive BC.
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Acknowledgments
This work was partially funded by Cancer Research UK (AF, CC), The Prostate Cancer Charity (JS, JHG) and the Experimental Cancer Medicine Centre (SR). We thank Professor Ian Hart for his expert advice and guidance in performing the cell invasion assays and use of the facilities in his laboratory at St Bart’s School of Medicine and Dentistry. We thank Prof. P Wong for providing NCSTN +/+ and NCSTN −/− MEFs, Maria Afentakis for performing the nicastrin staining of normal breast tissue and paired tumor/lymph node samples, and Marhokh Nohadani for TMA IHC.
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NCSTN+/+ MEFs. Video represents 10 h time-lapse microscopy with image collected 1 frame/10 min (MPG 3238 kb)
NCSTN−/− MEFs. Video represents 10 h time-lapse microscopy with image collected 1 frame/10 min. Display rate is 10 frames per second (MPG 2942 kb)
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Filipović, A., Gronau, J.H., Green, A.R. et al. Biological and clinical implications of nicastrin expression in invasive breast cancer. Breast Cancer Res Treat 125, 43–53 (2011). https://doi.org/10.1007/s10549-010-0823-1
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DOI: https://doi.org/10.1007/s10549-010-0823-1