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Bazedoxifene is a selective estrogen receptor modulator (SERM) with IC50 value of 26 and 99 nM for estrogen receptorα and β, respectively [1].

Bazedoxifene is a SERM used for the prevention and treatment of post menopausalo steoporosis which is caused by the loss of endogenous levels of estrogens. It is developed as a third-generation SERM which can reduce the vertebral and nonvertebral fracture risk and have no stimulatory effects on breast or uterus. Bazedoxifene is an estrogen receptor ligand with an indole-based core binding domain. It binds to both ERα (IC50 value of 23nM) and ERβ (IC50 value of 85nM), exhibited agonist activity in bone, cardiovascular system and CNS while exhibited antagonist activity in breast and endometrium. It competitively inhibited the binding of 17β-estradiol to both ERα and ERβ [1, 2 and 3].

In MCF7 cells, treatment of bazedoxifene showed no ER agonist activity and no effect on the cell proliferation. However, it suppressed the 17β-estradiol -induced transcriptional activation and cell proliferation [3].

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