Rational Design of a Boron-Modified Triphenylethylene (GLL398) as an Oral Selective Estrogen Receptor Downregulator.

ABSTRACT: Development of orally bioavailable nonsteroidal selective estrogen receptor downregulators (SERDs) provides clinical opportunities for the long-term treatment and adjuvant therapy of breast cancer at all stages. We describe the design, synthesis, and identification of a boron-modified GW7604 derivative (GLL398, 9), a SERD candidate, in which a boronic acid functional group replaces the phenolic hydroxyl group of GW7604. Compound 9 strongly binds to ER? in a fluorescence resonance energy transfer binding assay (IC50 = 1.14 nM) and potently degrades ER? in MCF-7 breast cancer cells (IC50 = 0.21 ?M). Most importantly, the introduction of the boronic acid group confers superior oral bioavailability of 9 (AUC = 36.9 ?g·h/mL) in rats as compared to GW7604 (AUC = 3.35 ?g·h/mL). The strikingly favorable pharmacokinetic property of 9 makes it a promising oral SERD suitable for clinical evaluation.

SUBMITTER: Liu J 

PROVIDER: S-EPMC5238461 | biostudies-other | 2017 Jan

REPOSITORIES: biostudies-other