Inecalcitol (TX 522), a unique vitamin D3 analog, is an orally active vitamin D receptor (VDR) agonist. Inecalcitol can induce cell apoptosis and has potent anticancer activities[1][2][3.
Inecalcitol (0.1-10 nM; 48 hours) treatment of LNCaP cells resulted in decreased expression of both protein and mRNA of Pim-1 in a dose-dependent manner. Inecalcitol (0.1-10 nM; 48 hours) also decreases ETV1 expression levels in a dose-dependent manner[1].Inecalcitol (10-14 days) inhibits the growth of LNCaP and HL-60 cells with ED50 values of 4.0 nM and 0.28 nM, respectively[1].
Inecalcitol (1.3 mg/kg; i.p.; 3 times per week; for 42 days) inhibits androgen-responsive prostate cancer growth in vivo[1]. Pharmacokinetic studies show that plasma half-life of Inecalcitol (C57Bl/6J mice; 1.3 mg/kg; i.p.) is 18.3 minutes in mice[1].
References:
[1]. Ryoko Okamoto, et al. Inecalcitol, an analog of 1α,25(OH)(2) D(3) , induces growth arrest of androgen-dependent prostate cancer cells. Int J Cancer. 2012 May 15;130(10):2464-73.
[2]. Jacques Medioni, et al. Phase I safety and pharmacodynamic of inecalcitol, a novel VDR agonist with docetaxel in metastatic castration-resistant prostate cancer patients. Clin Cancer Res. 2014 Sep 1;20(17):4471-7.
[3]. Yingyu Ma, et al. Inecalcitol, an analog of 1,25D3, displays enhanced antitumor activity through the induction of apoptosis in a squamous cell carcinoma model system. Cell Cycle. 2013 Mar 1;12(5):743-52.