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在色谱分析、有机合成和交叉偶联反应领域已被 4 篇同行评审文献引用。
Tamoxifen Citrate (ICI 46474) 是一种选择性雌激素受体调节剂 (SERM),可阻断乳腺细胞中的雌激素作用,并可激活其他细胞,如骨骼,肝脏和子宫细胞中的雌激素活性。Tamoxifen Citrate 是一种有效的 Hsp90 激活剂,可增强 Hsp90 分子伴侣 ATPase 的活性。Tamoxifen Citrate 还可以有效抑制传染性 EBOV Zaire 和 Marburg (MARV),IC50 分别为 0.1 µM 和 1.8 µM。Tamoxifen Citrate 可以激活自噬 (autophagy),诱导凋亡 (apoptosis)
Information
Tamoxifen Citrate (ICI 46474) is a selectiveestrogen receptormodulator (SERM). Tamoxifen Citrate is also a potentHsp90activator and enhances the Hsp90 molecular chaperone ATPase activity. Tamoxifen inducesapoptosisandautophagy.
In vitro
Tamoxifen displays antitumor effect due to its antiestrogenic activity (ER). Values for the apparent affinity of Tamoxifen for the ER range between 30 and 0.01% of that obtained for estradiol, dependent on different ER source (species), protein concentration and condition used for assay. Binding of Tamoxifen to ER further leads to inhibition expression of estrogen-regulated genes, including growth factors and angiogenic factors secreted by the tumor that may stimulate growth by autocrine or paracrine mechanisms. Tamoxifen also directly induces programmed cell death. Tamoxifen produces an inhibitory effect on MCF-7 cell [3H]thymidine incorporation and DNA polymerase activity as well as causing a reduction in DNA content of cultures and cell numbers. This inhibitory effect of Tamoxifen on MCF-7 cell growth can be readily reversed by addition of estradiol to the culture medium. 2 and 6 μM Tamoxifen reduces the proportion of cells in S phase and increases the number of cells in G1. At 10 μM, Tamoxifen causes cell death within 48 hr. Tamoxifen inhibits MCF-7 growth with IC50 of ~10 nM after 10 days treatment. Tamoxifen inhibits plasminogen activator activity of MCF-7, and suppresses estradiol-stimulation of plasminogen activator activity. Tamoxifen also evokes minimal increases in cellular progesterone receptor levels. Tamoxifen is able to inhibit the growth of prostate cancer cell PC3, PC3-M, and DU145 with IC50 ranged from 5.5-10 μM, which is related to its inhibition of protein kinase C and induction of p21(waf1/cip1).
In vivo
Tamoxifen administration to rapidly growing, estradiol-stimulated MCF-7 xenografts results in a dose-dependent retardation or cessation of tumor growth by significantly decreasing tumor cell proliferation in tumor. Tamoxifen treatment results in a slowing of tumor growth (tumor doubling time, 12 days), a significant increase in tumor potential doubling time (Tpot) (6.6 days), and a decrease in labeling index (%LI) (to 8%) by 23 days posttreatment, compared with untreated mice which shows a volume doubling time of 5 days, a Tpot of 2.3 days, and a %LI of 23%. Tamoxifen has not only antiestrogenic but also estrogenic properties depending on the species, tissue, and gene. Tamoxifen displays favorable effects on bone and serum lipid concentrations and stimulation endometrium.
Cell Data
cell lines:HeLa cells
Concentrations:~1 μM
Incubation Time:10 days
Powder Purity:≥97%
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| 批号(Lot Number) | 证书类型 | 货号 |
|---|---|---|
| 分析证书 | T407770 |