Tamoxifen Citrate

Catalog No.S1972 Synonyms: ICI 46474 Citrate

Tamoxifen Citrate Chemical Structure

Molecular Weight(MW): 563.64

Tamoxifen Citrate is an antagonist of the estrogen receptor by competitive inhibition of estrogen binding.

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In DMSO USD 130 In stock
USD 97 In stock
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Cited by 1 Publication

1 Customer Review

  • Effects of DPN, LY500307, Raloxifene and Tamoxifen on cell viability in BSO-treated FRDA fibroblasts. BSO concentration was 1 mM and all steroid concentrations were 100 nM. Depicted are mean ± SD for n= 8 per group. * indicated p<0.05 versus BSO alone-treated cells.

    University of North Texas Health Science Center, 2014.. Tamoxifen Citrate purchased from Selleck.

Purity & Quality Control

Choose Selective Estrogen/progestogen Receptor Inhibitors

Biological Activity

Description Tamoxifen Citrate is an antagonist of the estrogen receptor by competitive inhibition of estrogen binding.
ER [1]
(Cell-free assay)
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. [1] 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. [2] 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. [3] 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). [4]

Cell Data
Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID
human MCF7 cells MlXHR5l1d3SxeHnjxsBie3OjeR?= NEnKSYUyQCCq Ml25R5l1d3SxeHnjbZR6KGGpYXnud5QhcHWvYX6gUWNHPyClZXzsd{Bi\nSncjCxPEBpenNiYomgUXRVKGG|c3H5MEBKSzVyPUGwMlIh|ryP NIjOUHIyQTl|MkCyOC=>
human MDA-MB-231 cells NF3EXoNEgXSxdH;4bYPDqGG|c3H5 Mk\tNVghcA>? MnHPR5l1d3SxeHnjbZR6KGGpYXnud5QhcHWvYX6gUWRCNU2ELUKzNUBk\WyuczDh[pRmeiBzODDodpMh[nliTWTUJIF{e2G7LDDJR|UxRTF{LkOg{txO MYexPVk{OjB{NB?=
human Ishikawa cells M333d2N6fG:2b4jpZ:Kh[XO|YYm= MkSzNVghcA>? Mke2R5l1d3SxeHnjbZR6KGGpYXnud5QhcHWvYX6gTZNpcWujd3GgZ4VtdHNiYX\0[ZIhOThiaILzJIJ6KE2WVDDhd5NigSxiSVO1NF0yOi53IN88US=> NGnBW4QyQTl|MkCyOC=>
human DU145 cells MVLDfZRwfG:6aXRCpIF{e2G7 Mn21NVghcA>? M2WzXWN6fG:2b4jpZ4l1gSCjZ3HpcpN1KGi3bXHuJGRWOTR3IHPlcIx{KGGodHXyJFE5KGi{czDifUBOXFRiYYPzZZktKEmFNUC9NVUvOjVizszN M1TrZlE6QTN{MEK0

... Click to View More Cell Line Experimental Data

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%. [5] 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. [1]


Kinase Assay:


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Competitive binding assays:

Cells are harvested from 150-sq cm T-flasks, and cytosol is prepared at a protein concentration of approximately 2 mg/mL in phosphate buffer. Aliquots of this 180,000 ×g supernatant are then incubated with various concentrations of Tamoxifen and 2.5 nM [3H]estradiol for 16 hr at 0-4 ℃. The free steroids are absorbed by dextran-charcoal [l0 μL of 0.5% Dextran C-5% Norite A in TE buffer] for 1 hr at 0 ℃, and aliquots are counted after centrifugation at 800 ×g, 30 min. The relative binding ability of each competitor is taken as the ratio of the concentration of radioinert estradiol/competitor required to inhibit one-half of the specific [3H]estradiol binding, with the affinity of estradiol set at 100%.
Cell Research:


+ Expand
  • Cell lines: Human breast cancer cells MCF-7
  • Concentrations: ~1 μM
  • Incubation Time: 10 days
  • Method:

    MCF-7 cells are seeded into T-25 flasks (1.5×105 cells/flask) and grown for 2 days in the MEM supplemented with 10 mM HEPES buffer, gentamicin (50 μg/mL), penicillin (100 units/mL), streptomycin (0.1 mg/mL), bovine insulin (6 ng/mL), hydrocortisone (3.75 ng/mL), and 5% calf serum that has been treated with dextran-coated charcoal for 45 min at 55 ℃ to remove endogenous hormones. The medium is then changed to MEM supplemented as described above, except that it contains 2% charcoal dextran-treated calf serum and various concentrations of Tamoxifen. At the end of incubation, cell numbers are counted.

    (Only for Reference)
Animal Research:


+ Expand
  • Animal Models: Human breast carcinoma xenografts MCF-7
  • Formulation: Silastic capsules
  • Dosages: 2 cm Tamoxifen capsules
  • Administration: Subcutaneous implantation
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 100 mg/mL (177.41 mM)
Ethanol 100 mg/mL (177.41 mM)
Water Insoluble
In vivo Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
30% PEG400+0.5% Tween80+5% propylene glycol
For best results, use promptly after mixing.
30 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 563.64


CAS No. 54965-24-1
Storage powder
in solvent
Synonyms ICI 46474 Citrate

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Clinical Trial Information

NCT Number Recruitment interventions Conditions Sponsor/Collaborators Start Date Phases
NCT03582865 Not yet recruiting Drug: Tamoxifen 20 mg Breast Cancer Assiut University September 1 2019 --
NCT02801786 Not yet recruiting Drug: Placebo|Drug: Lidocaine|Drug: Tamoxifen Pain|Discomfort Universidade Federal de Goias November 2018 Phase 2|Phase 3
NCT03707340 Recruiting Drug: Flibanserin Pill Breast Cancer|Hyposexual Desire Disorder Memorial Sloan Kettering Cancer Center September 14 2018 --

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Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

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Frequently Asked Questions

  • Question 1:

    I am wondering if the Tamoxifen (product Cat # S1972) is a 4-hydroxy Tamoxifen form or just plain Tamoxifen Citrate?

  • Answer:

    The Tamoxifen (S1972) is a prodrug, just plain Tamoxifen citrate.

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID