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- W2003205168 abstract "We have previously developed an in vitro tumor progression model with mouse skin keratinocytes to study the molecular targets that mediate the tumor cell's progression from a benign to a malignant phenotype. The malignantly transformed cells were found to have elevated MAP kinase signaling and increases in AP-1, NFκB and cAMP response element (CRE) transcription factors activities compared to their benign counter-part. In this study, we showed that Rac1, a member of the Rho superfamily of small GTPases, functions as a key signaling molecule that mediates these malignant phenotypes. We used a doxycycline inducible system to express dominant negative Rac1 (N17 Rac1) in the squamous cell carcinomas producing 6M90 cell line. Conditional expression of the N17 Rac1 was able to decrease multiple markers of malignancy including: growth rate, colony formation, migration, invasion and most importantly, in vivo tumor growth. In addition, these phenotypic changes were accompanied by decreases in mitogenic signals, which include ERK1/2, JNK, and PI-3 kinase/Akt activation. Transactivation mediated by AP-1, NFκB, and CRE were also attenuated by expression of dominant negative Rac1. These observations led us to conclude that Rac1 signaling is required for the malignant phenotypes of the squamous cell carcinoma cells." @default.
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- W2003205168 date "2006-01-01" @default.
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- W2003205168 title "The role of Rac1 in maintaining malignant phenotype of mouse skin tumor cells" @default.
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- W2003205168 doi "https://doi.org/10.1016/j.canlet.2005.02.031" @default.
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