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Molecular Endocrinology, doi:10.1210/me.2002-0323
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Molecular Endocrinology 17 (3): 356-365
Copyright © 2003 by The Endocrine Society

The NEDD8 Pathway Is Required for Proteasome-Mediated Degradation of Human Estrogen Receptor (ER)-{alpha} and Essential for the Antiproliferative Activity of ICI 182,780 in ER{alpha}-Positive Breast Cancer Cells

Meiyun Fan, Robert M. Bigsby and Kenneth P. Nephew

Medical Sciences (M.F., K.P.N.), Indiana University School of Medicine, Bloomington, Indiana 47405; and Departments of Obstetrics & Gynecology (R.M.B., K.P.N.) and of Cellular and Integrative Physiology (R.M.B., K.P.N.), Indiana University Cancer Center (R.M.B., K.P.N.), Indiana University School of Medicine, Indianapolis, Indiana 46202

Address all correspondence and requests for reprints to: Kenneth P. Nephew, Ph.D., Medical Sciences, Indiana University School of Medicine, 302 Jordan Hall, 1001 East Third Street, Bloomington, Indiana 47405-4401. E-mail: knephew{at}indiana.edu.

Steroid hormone receptors, including estrogen receptor-{alpha} (ER{alpha}), are ligand-activated transcription factors, and hormone binding leads to depletion of receptor levels via preteasome-mediated degradation. NEDD8 (neural precursor cell-expressed developmentally down-regulated) is an ubiquitin-like protein essential for protein processing and cell cycle progression. We recently demonstrated that ubiquitin-activating enzyme (Uba)3, the catalytic subunit of the NEDD8-activating enzyme, inhibits ER{alpha} transcriptional activity. Here we report that Uba3-mediated inhibition of ER{alpha} transactivation function is due to increased receptor protein turnover. Coexpression of Uba3 with ER{alpha} increased receptor degradation by the 26S proteasome. Inhibition of NEDD8 activation and conjugation diminished polyubiquitination of ER{alpha} and blocked proteasome-mediated degradation of receptor protein. The antiestrogen ICI 182,780 is known to induce ER degradation. In human MCF7 breast cancer cells modified to contain a disrupted NEDD8 pathway, ICI 182,780 degradation of ER{alpha} was impaired, and the antiestrogen was ineffective at inhibiting cell proliferation. This study provides the first evidence linking nuclear receptor degradation with the NEDD8 pathway and the ubiquitin-proteasome system, suggesting that the two pathways can act together to modulate ER{alpha} turnover and cellular responses to estrogens. Based on our observation that an intact NEDD8 pathway is essential for the antiproliferation activity of the ICI 182,780 in ER{alpha} positive breast cancer cells, we propose that disruptions in the NEDD8 pathway provide a mechanism by which breast cancer cells acquire antiestrogen resistance while retaining expression of ER{alpha}.

NURSA Molecule Pages Link:

Nuclear Receptors:   ERα
Coregulators:   Uba3
Ligands:   17β-Estradiol  |  4-Hydroxytamoxifen



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