Tamoxifen
For research use only.
Catalog No.S1238 Synonyms: ICI 46474
25 publications
Molecular Weight(MW): 371.51
Tamoxifen is an antagonist of the estrogen receptor in breast tissue. Tamoxifen enhances the Hsp90 molecular chaperone ATPase activity. Tamoxifen induces apoptosis.
Purity & Quality Control
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Biological Activity
| Description | Tamoxifen is an antagonist of the estrogen receptor in breast tissue. Tamoxifen enhances the Hsp90 molecular chaperone ATPase activity. Tamoxifen induces apoptosis. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Targets |
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| In vitro |
TAM treatment inhibits significantly MCF7 cell proliferation. Low doses of TAM are able to induce structural chromosomal aberrations (deletions, isochromosomes, translocations, and dicentric chromosomes) in both ER+ and ER- breast cancer cells. This genotoxic effect is higher in those cell lines with HER2 gene amplification[2]. Whereas TAM at lower concentrations (0.1-1 μM) induces a cell-cycle arrest, pharmacological concentrations (above 5 μM) of TAM have been found to induce apoptosis of breast cancer cells. 5 μM TAM rapidly induced sustained activation of ERK1/2 in ER-positive breast cancer cell lines (MCF-7 and T47D)[3] |
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| Cell Data |
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| Assay |
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| In vivo | Tamoxifen (TAM) is widely used for both treatment and prevention of breast cancer. However, it is also carcinogenic in human uterus and rat liver[2]. Tm-inducible Cre-loxP systems are being used in broad areas of research and are providing important biologic insights in tissue development, maintenance, and function. Tamoxifen-induced nuclear localization of Cre recombinase is time- and dose-dependent. Higher doses of tamoxifen induce recombination weeks following administration and Lower doses of tamoxifen induce recombination up to one week following administration. Duration of tamoxifen-induced gene recombination is also dose-dependent. Administration of high Tm doses leads to extended CreER nuclear localization. Tm treatment induces side effects that may have physiologic consequences in Tm-inducible models[4]. |
Protocol
| Cell Research: |
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Solubility (25°C)
| In vitro | DMSO | 74 mg/mL (199.18 mM) |
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| Water | Insoluble | |
| Ethanol | ''74 mg/mL | |
| In vivo | Add solvents to the product individually and in order(Data is from Selleck tests instead of citations): 2% DMSO+30% PEG 300+2% Tween 80+ddH2O For best results, use promptly after mixing. |
1mg/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 | 371.51 |
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| Formula | C26H29NO |
| CAS No. | 10540-29-1 |
| Storage |
powder in solvent |
| Synonyms | ICI 46474 |
| Smiles | CC/C(C1=CC=CC=C1)=C(C2=CC=CC=C2)/C3=CC=C(OCCN(C)C)C=C3.OC(=O)CC(O)(CC(O)=O)C(O)=O |
In vivo Formulation Calculator (Clear solution)
| Step 1: Enter information below (Recommended: An additional animal making an allowance for loss during the experiment) | ||||||||||
| Dosage | mg/kg |  |
Average weight of animals | g | |
Dosing volume per animal | ul | |
Number of animals | |
| Step 2: Enter the in vivo formulation (Different batches have different solubility ratios, please contact Selleck to provide you with the correct ratio) | ||||||||||
| % DMSO % % Tween 80 % ddH2O | ||||||||||
| CalculateReset | ||||||||||
Calculation results:
Working concentration： mg/ml；
Method for preparing DMSO master liquid: ： mg drug pre-dissolved in μL DMSO (Master liquid concentration mg/mL，)
Method for preparing in vivo formulation：Take DMSO master liquid, next addμL PEG300， mix and clarify, next addμL Tween 80，mix and clarify, next add μL ddH2O，mix and clarify.
1.Please make sure the liquid is clear before adding the next solvent.
2.Be sure to add the solvent(s) in order. You must ensure that the solution obtained, in the previous addition, is a clear solution before proceeding to add the next solvent. Physical methods such as vortex, ultrasound or hot water bath can be used to aid dissolving.
Bio Calculators
Molarity Calculator
Calculate the mass, volume or concentration required for a solution. The Selleck molarity calculator is based on the following equation:
Mass (mg) = Concentration (mM) × Volume (mL) × Molecular Weight (g/mol)
*When preparing stock solutions, please always use the batch-specific molecular weight of the product found on the via label and MSDS / COA (available on product pages).
Dilution Calculator
Calculate the dilution required to prepare a stock solution. The Selleck dilution calculator is based on the following equation:
Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
This equation is commonly abbreviated as: C1V1 = C2V2 ( Input Output )
* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
Molecular Weight Calculator
Enter the chemical formula of a compound to calculate its molar mass and elemental composition:
Tip: Chemical formula is case sensitive. C10H16N2O2 c10h16n2o2
Instructions to calculate molar mass (molecular weight) of a chemical compound:
To calculate molar mass of a chemical compound, please enter its chemical formula and click 'Calculate'.
Definitions of molecular mass, molecular weight, molar mass and molar weight:
Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
Molarity Calculator
Clinical Trial Information
| NCT Number | Recruitment | interventions | Conditions | Sponsor/Collaborators | Start Date | Phases |
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| NCT04174352 | Suspended | Drug: Tamoxifen|Diagnostic Test: FES PET/CT | ERα+ Breast Cancer|ESR1 Gene Mutation | University of Wisconsin Madison | June 2020 | Early Phase 1 |
| NCT04200066 | Not yet recruiting | Drug: Temozolomide Tamoxifen Maprotiline | Glioblastoma|Brain Tumor | University of Rochester | February 1 2020 | Phase 1 |
| NCT04312347 | Recruiting | Drug: Tamoxifen dose adjustment | ER+ Breast Cancer | Nalagenetics Pte Ltd | September 6 2019 | Not Applicable |
| 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 |
Tech Support
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
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Question 1:
Could you tell me if you have a protocol for the use of tamoxifen (S1238) in vivo in mouse? Is there an administration way that is better than another?
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Answer:
Tamoxifen (S1238) can be dissolved in 10% ethanol/10% Tween 80/ddH2O at 5 mg/ml clearly. But precipitation will form if the formulation was left at RT for an hour or longer. So we'd suggest that you use it quickly after formulation. Tamoxifen is often administrated via i.p injection.
