Catalog No.S2246 Synonyms: CB7630
Molecular Weight(MW): 391.55
Abiraterone Acetate is an acetate salt form of Abiraterone which is a steroidal cytochrome CYP17 inhibitor with IC50 of 72 nM in a cell-free assay.
Cited by 7 Publications
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BCaPT10 and BPH-1 cells were treated with vehicle (NTC, white bars), 10 uM abiraterone (ABI, gray bars), or abiraterone plus steroid hormones (black bars, 100 nM DHT, 10 nM estradiol, and 10 nM progestin). Minimum of 200 cells per condition was used from each of at least 3 independent experiments. Each result is shown as the average 盨EM from at least 3 independent experiments. One-way ANOVA. *, P < .05; **, P < .01; ***, P < .005; ****, P < .001.
Endocrinology 2014 155(2), 358-69. Abiraterone Acetate purchased from Selleck.
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|Description||Abiraterone Acetate is an acetate salt form of Abiraterone which is a steroidal cytochrome CYP17 inhibitor with IC50 of 72 nM in a cell-free assay.|
|Features||Abiraterone is a drug used in castration-resistant prostate cancer.|
Abiraterone shows a good complexation with the heme iron only in SM1.  Abiraterone blocks the synthesis of androgens by inhibiting CYP17A1. Abiraterone also blocks 3β-hydroxysteroid dehydrogenase (3βHSD), an enzyme that is absolutely required for the synthesis of biologically active androgens. Abiraterone inhibits conversion of DHEA to Δ4-androstenedione. Abiraterone inhibition of 3βHSD blocks DHT synthesis and the androgen receptor response. Abiraterone inhibits the conversion of Δ5-androstenediol to testosterone.  Abiraterone inhibits C17,20-lyase, with an IC50 of 5.8 nM, in rat testis microsomes. Abiraterone significantly inhibits testosterone secretion (−48%) and in turn increases LH concentration (192%).  Abiraterone inhibits in vitro proliferation and AR-regulated gene expression of AR-positive prostate cancer cells, which could be explained by AR antagonism in addition to inhibition of steroidogenesis. 
|In vivo||Following intraperitoneal administration in a rodent model, abiraterone was found to have rapid deacetylation. When administered as its acetate pro-drug (CB 7630), it suppressed circulating testosterone to undetectable levels and markedly decreased the weights of androgen sensitive organs. Abiraterone is well tolerated and the mean elimination half-life of abiraterone in these studies was 27.6 h (thus supporting the use of once-daily dosing). Preclinical studies with abiraterone demonstrated reduction in androgen production downstream of CYP17 which resulted in decreased weight of the ventral prostate, testis, and seminal vesicles in mice.|
C17,20-lyase activity assay:Microsomes are diluted to a final protein concentration of 50 μg/mL in the reaction mixture which contains 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, test compounds are 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 in our laboratory using a specific antibody against Δ4A and instructions provided by Biogenesis. 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 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.
-  Pinto-Bazurco Mendieta MA, et al. J Med Chem. 2008, 51(16), 5009-5018.
-  Li R, et al. Clin Cancer Res. 2012, 18(13), 3571-3579.
-  Duc I, et al. J Steroid Biochem Mol Biol. 2003, 84(5), 537-542.
|In vitro||Ethanol||28 mg/mL (71.51 mM)|
|In vivo||Add solvents individually and in order:
5% DMSO+95% Corn oil
* 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.
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* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT01553188||Active, not recruiting||Prostatic Neoplams|Prostate Cancer|Neoplasm, Prostate|Neoplasm,Prostatic||National Cancer Institute (NCI)|National Institutes of Health Clinical Center (CC)||February 7, 2012||Phase 2|
|NCT02403505||Not yet recruiting||Stage, Prostate Cancer|Surgery||Dr. Han Xu, President/CEO / PD / PI / Monitor / IRB Chair|PPD|Medicine Invention Design, Inc||August 2020||Phase 3|
|NCT02949284||Not yet recruiting||Stage II Prostate Adenocarcinoma|Stage III Prostate Adenocarcinoma||Rutgers, The State University of New Jersey|National Cancer Institute (NCI)||June 2017||Phase 2|
|NCT02987543||Recruiting||Metastatic Castration-resistant Prostate Cancer||AstraZeneca||February 2017||Phase 3|
|NCT02789878||Not yet recruiting||Prostate Cancer||Instituto do Cancer do Estado de São Paulo|Janssen, LP||February 2017||Phase 2|
|NCT02975934||Recruiting||Metastatic Castration Resistant Prostate Cancer||Clovis Oncology, Inc.|Foundation Medicine||January 2017||Phase 3|
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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