A mutant selective anti-estrogen is a pure antagonist on EREs and AP-1 response elements.

Abstract excerpt

Estrogen receptors (ERs) regulate gene transcription through classic estrogen response elements (EREs) as well as AP-1 responsive genes. The common SERMs Raloxifene, Tamoxifen, and ICI164384 function as ER antagonists on EREs but as ERbeta agonists/partial agonists on AP-1 responsive genes. While developing a mutant selective analog of Raloxifene, that is an antagonist of ERalpha(E353A), we discovered an...

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