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Molecular Pharmacology

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Research ArticleArticle

Differential Response of Estrogen Receptors α and β to SP500263, a Novel Potent Selective Estrogen Receptor Modulator

Helen Brady, Mary Doubleday, Leah M. Gayo-Fung, Matt Hickman, Sak Khammungkhune, Adam Kois, Stephanie Lipps, Steve Pierce, Normand Richard, Graciella Shevlin, May Kung Sutherland, David W. Anderson, Shripad S. Bhagwat and Bernd Stein
Molecular Pharmacology March 2002, 61 (3) 562-568; DOI: https://doi.org/10.1124/mol.61.3.562
Helen Brady
Signal Research Division, Celgene Corporation, San Diego, California
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Mary Doubleday
Signal Research Division, Celgene Corporation, San Diego, California
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Leah M. Gayo-Fung
Signal Research Division, Celgene Corporation, San Diego, California
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Matt Hickman
Signal Research Division, Celgene Corporation, San Diego, California
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Sak Khammungkhune
Signal Research Division, Celgene Corporation, San Diego, California
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Adam Kois
Signal Research Division, Celgene Corporation, San Diego, California
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Stephanie Lipps
Signal Research Division, Celgene Corporation, San Diego, California
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Steve Pierce
Signal Research Division, Celgene Corporation, San Diego, California
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Normand Richard
Signal Research Division, Celgene Corporation, San Diego, California
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Graciella Shevlin
Signal Research Division, Celgene Corporation, San Diego, California
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May Kung Sutherland
Signal Research Division, Celgene Corporation, San Diego, California
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David W. Anderson
Signal Research Division, Celgene Corporation, San Diego, California
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Shripad S. Bhagwat
Signal Research Division, Celgene Corporation, San Diego, California
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Bernd Stein
Signal Research Division, Celgene Corporation, San Diego, California
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Abstract

We determined the differential response of a novel SERM, SP500263, on estrogen receptor (ER) α and the more recently cloned ER-β. Because of the high homology of amino acid residues in the ligand-binding domain of ER-α and ER-β, we were not surprised to find that SP500263 binds to both ERs equally well. In contrast, SP500263 acts as a strong estrogen agonist in a strictly ER-α–specific manner in U2OS osteosarcoma cell lines blocking the production of interleukin (IL) 6 and granulocyte macrophage colony-stimulating factor. SP500263 also blocked IL-6 production in primary bone cells. The mechanism of this inhibition is different from the classic estrogen stimulation involving an estrogen response element (ERE). SP500263 does not activate gene expression through an ERE. In contrast to the results observed in U2OS cells, SP500263 acts as a strong estrogen antagonist in an MCF-7 breast cancer proliferation assay. Therefore, SP500263 is a member of a series of next-generation SERMs with functional selectivity toward ER-α and a mixed agonist/antagonist profile in a bone cell assay versus a breast cancer assay. The panel of assays described herein allow for the development of receptor-specific ligands that may be further developed into novel pharmaceuticals with an improved profile for the treatments of osteoporosis and breast cancer.

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Molecular Pharmacology: 61 (3)
Molecular Pharmacology
Vol. 61, Issue 3
1 Mar 2002
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Research ArticleArticle

Differential Response of Estrogen Receptors α and β to SP500263, a Novel Potent Selective Estrogen Receptor Modulator

Helen Brady, Mary Doubleday, Leah M. Gayo-Fung, Matt Hickman, Sak Khammungkhune, Adam Kois, Stephanie Lipps, Steve Pierce, Normand Richard, Graciella Shevlin, May Kung Sutherland, David W. Anderson, Shripad S. Bhagwat and Bernd Stein
Molecular Pharmacology March 1, 2002, 61 (3) 562-568; DOI: https://doi.org/10.1124/mol.61.3.562

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Research ArticleArticle

Differential Response of Estrogen Receptors α and β to SP500263, a Novel Potent Selective Estrogen Receptor Modulator

Helen Brady, Mary Doubleday, Leah M. Gayo-Fung, Matt Hickman, Sak Khammungkhune, Adam Kois, Stephanie Lipps, Steve Pierce, Normand Richard, Graciella Shevlin, May Kung Sutherland, David W. Anderson, Shripad S. Bhagwat and Bernd Stein
Molecular Pharmacology March 1, 2002, 61 (3) 562-568; DOI: https://doi.org/10.1124/mol.61.3.562
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