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• W2000883492 abstract "USF is a small family of basic helix-loop-helix leucine zipper (bHLH-zip) transcription factors with DNA binding specificities similar to that of the c-Myc oncoprotein. Evidence for a role of USF in growth control includes inhibition of c-Myc-dependent cellular transformation in vitro and loss of USF transcriptional activity in many cancer cell lines. However, a direct effect of USF on the tumorigenicity of an established cell line has never been demonstrated. Here, cell lines derived from rat embryo fibroblasts transformed by c-Ha-Ras and either c-Myc or E1A were used as model system to investigate the tumor suppression ability of USF. Overexpression of USF2 stimulated transcription and inhibited colony formation in c-Myc-transformed, but not E1A-transformed, fibroblasts. Stable clones expressing high USF2 levels were constructed from c-Myc-transformed fibroblasts. In two of these clones, overexpressed USF2 did not activate transcription, and there was no significant change in the transformed phenotype. In contrast, a clone that expressed transcriptionally active USF2 exhibited altered morphology and a strongly decreased ability to proliferate in semisolid medium. The ability of these cells to form tumors in nude mice was also decreased by a factor of more than 30 as compared to the parental cell line or cells overexpressing transcriptionally inactive USF2. Cotransfection assays with USF- or Myc-specific dominant-negative mutants indicated that active USF2 inhibited cellular transformation by preventing transcriptional repression by c-Myc." @default.
• W2000883492 created "2016-06-24" @default.
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• W2000883492 date "2005-01-01" @default.
• W2000883492 modified "2023-09-27" @default.
• W2000883492 title "Decreased tumorigenicity of c-Myc-transformed fibroblasts expressing active USF2" @default.
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• W2000883492 doi "https://doi.org/10.1016/j.yexcr.2004.08.013" @default.
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