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Estrogen-dependent cyclin E-cdk2 activation through p21 redistribution.

M D Planas-Silva·R A Weinberg
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Abstract

In order to elucidate the mechanisms by which estrogens and antiestrogens modulate the growth of breast cancer cells, we have characterized the changes induced by estradiol that occur during the G1 phase of the cell cycle of MCF-7 human mammary carcinoma cells. Addition of estradiol relieves the cell cycle block created by tamoxifen treatment, leading to marked activation of cyclin E-cdk2 complexes and phosphorylation of the retinoblastoma protein within 6 h. Cyclin D1 levels increase significantly while the levels of cyclin E, cdk2, and the p21 and p27 cdk inhibitors are relatively constant. However, the p21 cdk inhibitor shifts from its association with cyclin E-cdk2 to cyclin D1-cdk4, providing an explanation for the observed activation of the cyclin E-cdk2 complexes. These results support the notion that cyclin D1 has an important role in steroid-dependent cell proliferation and that estrogen, by regulating the activities of G1 cyclin-dependent kinases, can control the proliferation of breast cancer cells.

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Breast NeoplasmsCDC2-CDC28 KinasesCell CycleCell Cycle ProteinsCell DivisionCyclin D1Cyclin-Dependent Kinase 2Cyclin-Dependent Kinase Inhibitor p21Cyclin-Dependent Kinase Inhibitor p27Cyclin-Dependent KinasesCyclinsEnzyme ActivationEnzyme InhibitorsEstradiolFemaleHumansMicrotubule-Associated ProteinsOncogene ProteinsPhosphorylationProtein Serine-Threonine KinasesRetinoblastoma ProteinTamoxifenTime FactorsTumor Cells, CulturedTumor Suppressor ProteinsJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, Non-P.H.S.

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M D Planas-Silva, R A Weinberg. 1997. Estrogen-dependent cyclin E-cdk2 activation through p21 redistribution.. https://doi.org/10.1128/mcb.17.7.4059

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