Endoxifen Z-isomer hydrochloride


CAS No. : 1032008-74-4

Endoxifen Z-isomer hydrochloride,1032008-74-4
Product Details
For research use only. Not Intended for Therapeutic Use!
Cat No:I000189
Molecular Formula:C25H28ClNO2
Molecular Weight:409.95
Target:hERG Potassium Channel, Estrogen Receptor/ERR
IC50:1.6 μM [1]
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Cat No:I000189
Cas No:1032008-74-4
Product-Name:Endoxifen Z-isomer hydrochloride

Endoxifen Z-isomer hydrochloride is the most important Tamoxifen metabolite responsible for eliciting the anti-estrogenic effects of this drug in breast cancer cells expressing estrogen receptor-alpha (ERα). Endoxifen inhibits hERG tail currents at 50 mV in a concentration-dependent manner with IC50 values of 1.6 μM.
IC50 value: 1.6 μM [1]
Target: hERG Potassium Channel, Estrogen Receptor/ERR
Endoxifen Z-isomer hydrochloride is considered a prodrug, since it has a much higher potency for the estrogen receptor than its parent drug. Endoxifen inhibits the hERG channel protein trafficking to the plasma membrane in a concentration-dependent manner with Endoxifen being more potent than Tamoxifen. [1] Endoxifen is also shown to be a more potent inhibitor of estrogen target genes when ERβ is expressed. Additionally, low concentrations of Endoxifen observed in Tamoxifen treated patients with deficient CYP2D6 activity (20 to 40 nM) markedly inhibit estrogen-induced cell proliferation rates in the presence of ERβ, whereas much higher Endoxifen concentrations are needed when ERβ is absent.[2]


[1]. Chae YJ, et al. Endoxifen, the active metabolite of tamoxifen, inhibits cloned hERG potassium channels. Eur J Pharmacol. 2015 Apr 5;752:1-7.
[2]. Wu X, et al. Estrogen receptor-beta sensitizes breast cancer cells to the anti-estrogenic actions of endoxifen. Breast Cancer Res. 2011 Mar 10;13(2):R27.

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