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Mol. Cell. Biol., 09 1997, 5640-5647, Vol 17, No. 9
Copyright © 1997, American Society for Microbiology

Ectopic expression of cyclin D1 but not cyclin E induces anchorage- independent cell cycle progression

D Resnitzky
Department of Molecular Cell Biology, The Weizmann Institute of Science, Rehovot, Israel.

Normal fibroblasts are dependent on adhesion to a substrate for cell cycle progression. Adhesion-deprived Rat1 cells arrest in the G1 phase of the cell cycle, with low cyclin E-dependent kinase activity, low levels of cyclin D1 protein, and high levels of the cyclin-dependent kinase inhibitor p27kip1. To understand the signal transduction pathway underlying adhesion-dependent growth, it is important to know whether prevention of any one of these down-regulation events under conditions of adhesion deprivation is sufficient to prevent the G1 arrest. To that end, sublines of Rat1 fibroblasts capable of expressing cyclin E, cyclin D1, or both in an inducible manner were used. Ectopic expression of cyclin D1 was sufficient to allow cells to enter S phase in an adhesion-independent manner. In contrast, cells expressing exogenous cyclin E at a level high enough to overcome the p27kip1-imposed inhibition of cyclin E-dependent kinase activity still arrested in G1 when deprived of adhesion. Moreover, expression of both cyclins D1 and E in the same cells did not confer any additional growth advantage upon adhesion deprivation compared to the expression of cyclin D1 alone. Exogenously expressed cyclin D1 was down-regulated under conditions of adhesion deprivation, despite the fact that it was expressed from a heterologous promoter. The ability of cyclin D1-induced cells to enter S phase in an adhesion-independent manner disappears as soon as cyclin D1 proteins disappear. These results suggest that adhesion-dependent cell cycle progression is mediated through cyclin D1, at least in Rat1 fibroblasts.


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