Exemestane

Catalog No.S1196 Batch:S119650

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Technical Data

Formula

C20H24O2
Molecular Weight 296.4 CAS No. 107868-30-4
Solubility (25°C)* In vitro DMSO 59 mg/mL (199.05 mM)
Ethanol 41 mg/mL (138.32 mM)
Water Insoluble
* <1 mg/ml means slightly soluble or insoluble.
* 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.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

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Biological Activity

Description Exemestane is an aromatase inhibitor, inhibits human placental and rat ovarian aromatase with IC50 of 30 nM and 40 nM, respectively.
Targets
Aromatase (human) [1] Aromatase (rat) [1]
30 nM 40 nM
In vitro

Exemestane competitively inhibits and time-dependently inactivates of human placental aromatase with Ki of 4.3 nM. Exemestane displaces [3H]DHT from rat prostate androgen receptor with IC50 of 0.9 μM. [1] Exemestane (1 μM) increases alkaline phosphatase activity in hFOB and Saos-2 cells and induces the expression of MYBL2, OSTM1, HOXD11, ADCYAP1R1, and glypican 2 in hFOB cells. [2] Exemestane causes aromatase degradation in a dose-responsive manner in MCF-7aro cells. [3]
In vivo

Exemestane increases lumbar spine BMD by 14.0% in OVX rats at dose of 100 mg/kg. Exemestane (100 mg/kg) and 17-hydroexemestane (20 mg/kg) significantly reduces an ovariectomy-induced increase in serum pyridinoline and serum osteocalcin in rats and causes significant reductions of serum cholesterol and low-density lipoprotein cholesterol inOVX rats. [4] Exemestane (20 mg/kg/day s.c.) induces 26% complete (CR) and 18% partial (PR) tumor regressions in rats with 7,12-dimethylbenzanthracene (DMBA)-induced mammary tumors. [5]
Features 17-hydroexemestane is the principal metabolite of Exemestane.

Protocol (from reference)

Kinase Assay:

[1]
  • Assays with human placental aromatase

    Microsomes are prepared from human placenta and stored at -80℃. The rate of aromatization is determined by measuring the tritiated water released from [1β-3H]A. The assay is carried out in a final volume of 1 mL, in 10 mM phosphate buffer, pH 7.5, containing 100 mM KCl, 1 mM EDTA, 1 mM dithiothreitol, 100 μM NADPH, the enzyme preparation and the appropriate concentrations of Exemestane (in duplicate) and the substrate. After a 10 min incubation at 37 ℃, the assay is terminated by the addition of 4 mL cold chloroform. The acqueous phase is treated with a charcoal suspension, the supernatant is removed and counted for radioactivity by liquid scintillation in Rialuma. For the determination of the IC50 values, various concentrations of Exemestane are incubated with 20 μg of microsomal protein, in the presence of a fixed amount (50 nM) of [3H]A.
Cell Assay:

[2]
  • Cell lines

    hFOB cells

  • Concentrations

    1 μM

  • Incubation Time

    24 hours

  • Method

    hFOB is treated with steroids and Exemestane for 24 hours, when specimens are harvested and evaluated for cell proliferation using the WST-8 method. Optical densities (OD, 450 nm) are evaluated using a SpectraMax 190 microplate reader and Softmax Pro 4.3 microplate analysis software. The status of proliferation (%) is calculated according to the following equation: (cell OD value after test materials treated /vehicle control cell OD value)× 10
Animal Study:

[4]
  • Animal Models

    estrogen-deficient ovariectomized (OVX) rats

  • Dosages

    100 mg/kg

  • Administration

    Intramuscular injection

Customer Product Validation

, , Int J Oncol, 2015, 46(4):1481-90.

Data from [Data independently produced by , , Cell Physiol Biochem, 2017, 42(1):1-12]

Selleck's Exemestane has been cited by 23 publications

SERPINA3-ANKRD11-HDAC3 pathway induced aromatase inhibitor resistance in breast cancer can be reversed by HDAC3 inhibition [ Commun Biol, 2023, 6(1):695] PubMed: 37414914
Predicting clinical response to everolimus in ER+ breast cancers using machine-learning [ Front Mol Biosci, 2022, 9:981962] PubMed: 36304922
Predicting clinical response to everolimus in ER+ breast cancers using machine-learning [ Front Mol Biosci, 2022, 9:981962] PubMed: 36304922
Establishment and Characterization of NCC-PMP1-C1: A Novel Patient-Derived Cell Line of Metastatic Pseudomyxoma Peritonei [ J Pers Med, 2022, 12(2)258] PubMed: 35207746
Establishment and characterization of NCC-UPS4-C1: a novel cell line of undifferentiated pleomorphic sarcoma from a patient with Li-Fraumeni syndrome [ Hum Cell, 2022, 10.1007/s13577-022-00671-y] PubMed: 35118583
Characterization of the Major Single Nucleotide Polymorphic Variants of Aldo-Keto Reductase 1C3 (Type 5 17β-Hydroxysteroid Dehydrogenase) [ J Steroid Biochem Mol Biol, 2022, S0960-0760(22)00072-3] PubMed: 35489629
Systems Pharmacology-Based Precision Therapy and Drug Combination Discovery for Breast Cancer [ Cancers (Basel), 2021, 13(14)3586] PubMed: 34298802
Establishment and characterization of the NCC-GCTB4-C1 cell line: a novel patient-derived cell line from giant cell tumor of bone [ Hum Cell, 2021, 10.1007/s13577-021-00639-4] PubMed: 34731453
Establishment and characterization of novel patient-derived cell lines from giant cell tumor of bone [ Hum Cell, 2021, 10.1007/s13577-021-00579-z] PubMed: 34304386
Establishment and characterization of NCC-MFS4-C1: a novel patient-derived cell line of myxofibrosarcoma [ Hum Cell, 2021, 34(6):1911-1918] PubMed: 34383271

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