Journal
ACS MEDICINAL CHEMISTRY LETTERS
Volume 11, Issue 6, Pages 1342-1347Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsmedchemlett.0c00224
Keywords
GNE-149; ER alpha; SERD; antagonist; breast cancer; pure antiestrogen
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Estrogen receptor alpha (ER alpha) is a well-validated drug target for ER-positive (ER+) breast cancer. Fulvestrant is FDA-approved to treat ER+ breast cancer and works through two mechanisms.as a full antagonist and selective estrogen receptor degrader (SERD).but lacks oral bioavailability. Thus, we envisioned a best-in-class molecule with the same dual mechanisms as fulvestrant, but with significant oral exposure. Through lead optimization, we discovered a tool molecule 12 (GNE-149) with improved degradation and antiproliferative activity in both MCF7 and T47D cells. To illustrate the binding mode and key interactions of this scaffold with ER alpha, we obtained a cocrystal structure of 6 that showed ionic interaction of azetidine with Asp351 residue. Importantly, 12 showed favorable metabolic stability and good oral exposure. 12 exhibited antagonist effect in the uterus and demonstrated robust dose-dependent efficacy in xenograft models.
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