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Molecular Endocrinology, Vol 10, 488-498, Copyright © 1996 by Endocrine Society

ARTICLES

Estrogen regulates activity of cyclin-dependent kinases and retinoblastoma protein phosphorylation in breast cancer cells

JS Foster and J Wimalasena
Department of Obstetrics and Gynecology, University of Tennessee Medical Center, Knoxville 37920, USA.

Cyclin-dependent kinases (Cdk) act to regulate G1- to S-phase transition in mammalian cells. We have studied the effects of estradiol and the steroidal antiestrogen ICI 182, 780 on induction of Cdk activity and the consequent phosphorylation of retinoblastoma protein (Rb) in estrogen-responsive MCF-7 breast cancer cells. Treatment of growth-arrested MCF-7 cells with physiological concentrations of estradiol led to a time-dependent increase in Cdk2-associated and cyclin E-dependent kinase activity, which was accompanied by hyperphosphorylation of Rb and S-phase entry. Induction of both Cdk2 activity and DNA synthesis by estradiol was dose dependent and was inhibited by coadministration of ICI 182,780. Elicitation of Cdk2 activity was found to require prolonged (> 8h) estradiol exposure. Levels of cyclins E and A were unchanged in MCF-7 cells undergoing G1- to S-transit; however, synthesis and steady state levels of cyclin D1 protein were increased by estradiol. Cdk4-associated Rb kinase activity was evident in MCF-7 cells by 6 h after estradiol exposure and was inhibited by antiestrogen. Cdk2 and Cdk4 protein levels were not altered by estrogen treatment; however, faster migrating, phosphorylated Cdk2 forms increased in estradiol-treated MCF-7 cells by 12 after release from growth arrest. Cdtk-inhibitory activities, associated with p27kip-1, were eliminated from growth-arrested MCF-7 cells after treatment with estradiol but were not eliminated from cells cotreated with estradiol and ICI 182,780. These findings suggest that estradiol regulates G1 progression in MCF-7 cells through direct effects upon Cdk activation, Rb phosphorylation, and by inducing elimination of Cdk inhibitors.


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