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- W2945681621 abstract "Insulin-like Growth Factor-1 signaling has a well-described function in facilitating tumourigenesis and promoting tumour growth. Attempts to suppress IGF signals at the level of the IGF-1 Receptor have been disappointing, with kinase inhibitors and blocking antibodies generally showing poor efficacy in clinical trials. To address the mechanisms for this lack of efficacy we sought to identify proteins that modulate the cytotoxic response to IGF-1R tyrosine kinase inhibition using a functional siRNA screen. We identified the non-receptor tyrosine FES-related (FER) kinase as a mediator of sensitivity to the IGF-1R tyrosine kinase inhibitor in MCF-7 cells. We found that FER and the IGF-1R co-locate and can be co-immunoprecipitated from different cell types. Ectopic expression of FER strongly enhanced IGF-1R expression and phosphorylation on the atuophosphorylation sites at tyrosines 950 and 1131. FER phosphorylated these sites in an IGF-1R kinase-independent manner and also enhanced IGF-1-mediated phosphorylation of SHC, and activation of either the AKT or MAPK signaling pathways in breast cancer cell lines. The IGF-1R, β1 Integrin, FER and its substrate cortactin were all observed to be co-located in cell adhesion complexes, the disruption of which reduced IGF-1R expression and activity. High FER expression correlates with phosphorylation of SHC in breast cancer cell lines and with a poor prognosis in patient cohorts. FER and SHC phosphorylation and IGF-1R expression could be suppressed with a known ALK inhibitor that shows high specificity for FER kinase. Overall, we conclude that FER-enhances IGF-1R expression, phosphorylation and signaling to promote cooperative growth and adhesion signaling that may facilitate cancer progression and resistance to IGF-1R inhibition. Citation Format: Joanna Stanicka, Leonie Rieger, Orla T. Cox, Sandra O9Shea, Michael Coleman, Ciara O9Flanagan, Barbara Addario, Nuala McCabe, Richard Kennedy, Rosemary O9Connor. The FES-related tyrosine kinase associates with and activates the insulin-like growth factor 1 receptor at sites of cell adhesion [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2018; 2018 Apr 14-18; Chicago, IL. Philadelphia (PA): AACR; Cancer Res 2018;78(13 Suppl):Abstract nr 1794." @default.
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- W2945681621 date "2018-07-01" @default.
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- W2945681621 title "Abstract 1794: The FES-related tyrosine kinase associates with and activates the insulin-like growth factor 1 receptor at sites of cell adhesion" @default.
- W2945681621 doi "https://doi.org/10.1158/1538-7445.am2018-1794" @default.
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