Abiraterone
For research use only.
Catalog No.S1123 Synonyms: CB-7598
27 publications
CAS No. 154229-19-3
Abiraterone (CB-7598) is a potent CYP17 inhibitor with IC50 of 2 nM in a cell-free assay. Abiraterone (CB-7598) is an androgen biosynthesis inhibitor.
Purity & Quality Control
Choose Selective P450 (e.g. CYP17) Inhibitors
Biological Activity
| Description | Abiraterone (CB-7598) is a potent CYP17 inhibitor with IC50 of 2 nM in a cell-free assay. Abiraterone (CB-7598) is an androgen biosynthesis inhibitor. | |||||||||||||||||||||||
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| Features | Approved for the treatment of docetaxel-treated castration-resistant prostate cancer. | |||||||||||||||||||||||
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| In vitro |
Abiraterone binds and inhibits wild-type and mutant androgen receptor (AR). Abiraterone inhibits in vitro proliferation and androgen receptor-regulated gene expression of androgen receptor-positive prostate cancer cells, which could be explained by androgen receptor antagonism in addition to inhibition of steroidogenesis. In fact, activation of mutant androgen receptor by eplerenone is inhibited by greater concentrations of Abiraterone. Abiraterone displaces ligand from both WT-AR and T877A with EC50 of 13.4 μM and 7.9 μM, respectively. [2]Abiraterone inhibits lyase activity with an IC50 of 5.8 nM in rat testis microsomes. Abiraterone acetate significantly inhibits T secretion (−48%) and in turn increased LH concentration (192%).[3] |
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| Cell Data |
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| Assay |
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| In vivo | Abiraterone inhibits CYP17 with an IC50 of 72 nM, in human testicular microsomes. [4] Abiraterone fails to significantly reduce the size of any of the organs. [5] Abiraterone reduces the testosterone levels strongly, almost reaching the level of the orchiectomy control. The testosterone levels are reduced by Abiraterone for more than 95% compared to the control group. [6] |
Protocol
| Kinase Assay:[3] |
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C17,20-lyase activity assay: Microsomes are diluted to a final protein concentration of 50 μg/mL in the reaction mixture which contained 0.25 M sucrose, 20 mM Tris–HCl (pH 7.4), 10 mM G6P and 1.2 IU/mL G6PDH. After equilibration at 37 °C for 10 minutes, the reaction is initiated by addition of βNADP to obtain a final concentration of 0.6 mM. Prior to the distribution of 600 μL of the reaction mixture in each tube, Abiraterone is evaporated to dryness under a stream of nitrogen and then are incubated at 37 °C for 10 minutes. After incubation with Abiraterone, 500 μL of the reaction mixture is transferred to tubes containing 1 μM of the enzyme substrate, 17OHP. After a further 10 minutes incubation, tubes are placed on ice and the reaction is stopped by addition of 0.1 ml NaOH 1N. Tubes are deep-frozen and stored at −20 °C until assayed for Δ4A levels. A Δ4A RIA is developed and automated on a microplate format using a specific antibody against Δ4A. The separation of free and bound antigen is achieved with a dextran-coated charcoal suspension. After centrifugation, aliquots of the clear supernatant are counted in duplicates in a 1450 MicrobetaPlus liquid scintillation counter. The Δ4A concentrations of unknown samples are determined from the standard curve. The detection limit is 0.5 ng/mL and the within and between assay coefficients of variation are 10.7 and 17.6%, respectively at an assay value of 13 ng/mL. The rate of enzymatic reaction is expressed as pmol of Δ4A formed per 10 minutes and per mg of protein. The value of maximum activity without inhibitor (control) is set at 100%. The IC50 values are calculated using non-linear analysis from the plot of enzyme activity (%) against log of inhibitor concentration. |
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| Cell Research:[2] |
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| Animal Research:[5] |
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Solubility (25°C)
| In vitro | DMSO | 0 mg/mL (0.0 mM) |
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| Water | 0 mg/mL (0.0 mM) | |
| Ethanol | ''0 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 | 349.51 |
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| Formula | C24H31NO |
| CAS No. | 154229-19-3 |
| Storage |
powder in solvent |
| Synonyms | CB-7598 |
| Smiles | CC12CCC(CC1=CCC3C2CCC4(C3CC=C4C5=CN=CC=C5)C)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 () | ||||||||||
| % 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 μL 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:
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Instructions to calculate molar mass (molecular weight) of a chemical compound:
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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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| NCT04587427 | Not yet recruiting | Drug: Radium 223 dichloride (Xofigo BAY88-8223) | Metastatic Castration-resistant Prostate Cancer (mCRPC) | Bayer | June 30 2021 | -- |
| NCT04458311 | Recruiting | Drug: Abiraterone Acetate|Drug: Tildrakizumab | Metastatic Castration Resistant Prostate Cancer | Institute of Cancer Research United Kingdom|Sun Pharma Global FZE | December 1 2020 | Phase 1|Phase 2 |
| NCT04443062 | Recruiting | Drug: 177Lu-PSMA-I&T | Prostate Cancer | Radboud University|Prostaatkankerstichting | July 20 2020 | Phase 2 |
| NCT04268628 | Active not recruiting | Other: Serum and plasma samples analysis | Metastatic Castration-resistant Prostate Cancer | Janssen-Cilag Farmaceutica Ltda. | March 19 2020 | -- |
| NCT04158245 | Recruiting | Drug: 18F-fluciclovine PET Scan | Metastatic Castration-resistant Prostate Cancer | Tulane University|Blue Earth Diagnostics | January 30 2020 | Phase 2 |
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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