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  • Original Paper
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Ectopic expression of cyclin E in estrogen responsive cells abrogates antiestrogen mediated growth arrest

Abstract

Estrogens stimulate proliferation of estrogen receptor positive MCF7 breast cancer cells while antiestrogens signal a G0/G1 growth arrest. In MCF7 cells, arrest is mediated through the CDK inhibitors p21 and p27 and through a decrease in cyclin E/CDK2 kinase activity. We found that in MCF7 cells, overexpression of cyclin E partially abrogates a tamoxifen mediated growth arrest. Overexpression of cyclin E is accompanied by a decrease in the levels of RB and CDK inhibitor p21 but an increase in CDK inhibitor p27. Cyclin E overexpression also alters the composition of E2F transcription factor complexes. The E2F4/p107/cyclin E/CDK2 complex, a minor component in proliferating control cells that is absent in growth-arrested cells, is more abundant in both proliferating and tamoxifen treated cyclin E overexpressing cells. Conversely, levels of the quiescence associated E2F/p130 complex is not detected in these cells. Expression from the E2F dependant promoter is elevated in proliferating and tamoxifen treated cyclin E overexpressing cells. This study suggests that a modest overexpression of cyclin E abrogates the tamoxifen mediated growth arrest through modification of the RB/E2F pathway. Moreover, these results provide one explanation of why some cells that express the estrogen receptor may be unresponsive to antiestrogens.

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Acknowledgements

We thank Daniel P Vang and Brian Robinson for technical support, and Drs Michael F Seldin, Gigi Lozano and Clifford Tepper for critical reading of the manuscript. This study was supported in part by a VA Merit Award (M Mudryj) and the University of California, Davis Health System Research Award (M Mudryj).

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Correspondence to Maria Mudryj.

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Dhillon, N., Mudryj, M. Ectopic expression of cyclin E in estrogen responsive cells abrogates antiestrogen mediated growth arrest. Oncogene 21, 4626–4634 (2002). https://doi.org/10.1038/sj.onc.1205576

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