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- W2783704041 abstract "Exposure of certain cell lines to methylcholanthrene, X-rays, or physiological growth constraint leads to preneoplastic transformation in all or most of the treated cells. After attaining confluence, a fraction in those cells progress to full transformation, as evidenced by their ability to form discrete foci distinguishable from the surrounding cells by virtue of their higher density. Transformation induced by suspension in agar, an even stronger growth-selective condition than confluence, is reminiscent of all but the final differentiated stage of a normal developmental process, epithelial-mesenchymal transition. Changes associated with transformation are not restricted to focus-forming cells, as the permissiveness for focus formation provided by confluent cells surrounding transformed foci is greater than that of nonselected cells. The neoplastic process can also be reversed in culture. Transformed cells passaged at low density in high serum revert to normal morphology and growth behavior in vitro and lose the capacity for tumor formation in vivo. We propose that transformation and its reversal are driven by a process of phenotypic selection that involves entire heterogeneous populations of cells responding to microenvironmental changes. Because of the involvement of whole cell populations, we view this process as fundamentally adaptive and epigenetic in nature." @default.
- W2783704041 created "2018-01-26" @default.
- W2783704041 creator A5016757166 @default.
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- W2783704041 date "2018-01-08" @default.
- W2783704041 modified "2023-09-24" @default.
- W2783704041 title "Phenotypic selection as the biological mode of epigenetic conversion and reversion in cell transformation" @default.
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- W2783704041 doi "https://doi.org/10.1073/pnas.1717299115" @default.
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