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Correspondence to: Stephen W. Byers, E415 The Research Building, GUMC, 3970 Reservoir Road N.W., Washington, DC 20007. Tel:(202) 687-1813 Fax:(202) 687-7505 E-mail:byerss{at}gunet.georgetown.edu.
ß-Catenin is an important regulator of cellcell adhesion and embryonic development that associates with and regulates the function of the LEF/TCF family of transcription factors. Mutations of ß-catenin and the tumor suppressor gene, adenomatous polyposis coli, occur in human cancers, but it is not known if, and by what mechanism, increased ß-catenin causes cellular transformation. This study demonstrates that modest overexpression of ß-catenin in a normal epithelial cell results in cellular transformation. These cells form colonies in soft agar, survive in suspension, and continue to proliferate at high cell density and following
-irradiation. Endogenous cytoplasmic ß-catenin levels and signaling activity were also found to oscillate during the cell cycle. Taken together, these data demonstrate that ß-catenin functions as an oncogene by promoting the G1 to S phase transition and protecting cells from suspension-induced apoptosis (anoikis).
Key Words: ß-catenin, oncogene, cell cycle, anoikis, apoptosis
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