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FYN promotes breast cancer progression through epithelial-mesenchymal transition

FYN, one of the members of the Src family of kinases (SFKs), has been reported to be overexpressed in various types of cancers and correlated with cell motility and proliferation. However, the mechanism is still unclear. In the present study, we found that FYN was overexpressed in breast cancer and overexpression of FYN promoted cell proliferation, migration and invasion in the MCF10A cells, whereas depletion of FYN suppressed cell proliferation, migration and invasion in the MDA-MB-231 cells. Moreover, FYN upregulated the expression of mesenchymal markers and epithelial-mesenchymal transition (EMT)-related transcription factors, and downregulated the expression of epithelial markers, suggesting that FYN induces EMT in breast cancer cells. Furthermore, FYN was transcriptionally regulated by FOXO1 and mediated FGF2-induced EMT through both the PI3K/AKT and ERK/MAPK pathways.

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