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受注：045-509-1970 |
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化学情報
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Synonyms | CGS 20267 | Storage (From the date of receipt) |
3 years -20°C powder 1 years -80°C in solvent |
| 化学式 | C17H11N5 |
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| 分子量 | 285.3 | CAS No. | 112809-51-5 | |
| Solubility (25°C)* | 体外 | DMSO | 57 mg/mL (199.78 mM) | |
| Water | Insoluble | |||
| Ethanol | Insoluble | |||
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* <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. |
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溶剤液（一定の濃度）を調合する
生物活性
| 製品説明 | Letrozole is a third generation inhibitor of aromatase with IC50 of 0.07-20 nM in cell-free assays.It has no effect on the plasma levels of 17α-OH progesterone, thyroid-stimulating hormone (TSH), luteinizing hormone (LH), follicle-stimulating hormone (FSH), or androstenedione and does not affect normal urine electrolyte excretion or thyroid function in clinical studies. Letrozole induces autophagy. |
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| in vitro | Letrozole potently inhibits aromatase derived from a variety of different sources including human placental microsomes, particulate fractions of human breast cancer, rat ovarian microsomes, MCF-7 cells transfected with aromatase (MCF-7Ca), JEG-3 human choriocarcinoma cells , CHO cells, hamster ovarian tissue, and particulate fractions of human breast cancer with IC50 of 11, 2, 7, 0.07, 0.07, 1.4, 20 and 0.8 nM. In the non-cellular systems, the IC50 of letrozole is calculated to be 1-13 nM. [1] Letrozole maximally inhibits estradiol production in vitro in LH-stimulated hamster ovarian tissue at 0.1 μM with an IC50 of 0.02 μM and does not significantly affect progesterone production up to 350 μM. In ACTH-stimulated rat adrenal tissue in vitro, aldosterone production is inhibited by with an IC50 of 210 μM. [2] Letrozole inhibits growth of the MCF-7 epithelial breast cancer cells in a dose-dependent way with IC50 of 1 nM. Inhibition can be observesed even at the very low concentrations tested (0.1 nM). Treatment of normal MCF-12A epithelial cells with letrozole did not affect their growth even when high letrozole concentrations (100 nM) or prolonged culture times. Concurrent administration of 17-β-estradiol with letrozole (10 nM) decreased the stimulatory effect of the enzymatic activity of MMP-2 and - 9 released by estradiol. [3] |
| in vivo | Letrozole inhibits aromatase in vivo with ED50 of 1-3 μg/kg p.o.. [2] Letrozole displays anti-endocrine effects. Letrozole inhibits androstenedione-induced uterine hypertrophy in immature rats with ED50 of 1-3 μg/kg. In the adult female rat, Letrozole (0.3-1 mg/kg daily p.o., 14 days) completely interrupts ovarian cyclicity and reduces uterine weight and serum estradiol (E2) concentrations to a similar extent to that seen after ovariectomy. [1] Letrozole induces dose-dependent regression of estrogen-dependent, 9,10-dimethylbenz-a-anthracene-induced mammary tumors in adult female rats. The ED50 for Letrozole is determined to be 10 - 30 µg/kg/day, with complete inhibition at a daily dose of 10 µg/day. [4] Letrozole produces dose-dependent inhibition of tumor growth of MCF-7 cells transfected with human aromatase gene (MCF-7Ca) implanted athymic nude mice, with complete inhibition at 20 mg/kg per day p.o.. [5] |
プロトコル(参考用のみ)
| キナーゼアッセイ | Human placental aromatase activity | |
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| The assay is performed in a total volume of 1 mL at 37 ℃. Unless otherwise noted, the incubation mixture contains 11 nM [4- 14C] androstene-3, 17-dione ([4- 14C]A), 24 mM NADPH (tetrasodium salt Type III), the appropriate concentrations of the desired inhibitor, and 120 μg of microsomal protein. The (4- 14C)A is added as a solution in 1.7% ethanol in 0.05 M potassium phosphate buffer (pH 7.4), so that the final concentration of ethanol does not exceed 0.02% (v/v). The reaction is started by the addition of enzyme and stopped after 20 min by the addition of 7 vol of ethyl acetate. The mixture is agitated on a vortex mixer and centrifuged at 600 g for 5 min. The aqueous phase is re-extracted with 7 vol of ethyl acetate, and the combined extracts are evaporated to dryness using an Evapo-Mix. Over 99% of the radio- active of [4- 14C] added is recovered using this extraction system. The residue obtained is dissolved in 150 μL acetone, and 100 μL aliquots are chromatographed for 65 min on thin-layer plates precoated with silica gel 60 using ethyl: acetate: isooctane (140:60, v/v; system A) or toluene: chloroform: methanol (70:140:20; system B). The radioactive zones of the plate are located with a Berthold LB 2760 thin-layer scanner. The radioactive estradiol (E2) and estrone (E1) neaks are identified by comparison with authentic standards. The corresponding bonding band of silica gel is transferred to vials containing 10 mL of scintillation fluid, and counted with a 6880 Liquid Scintillation system. | ||
| 細胞アッセイ | 細胞株 | Human breast cancer cells MCF-7 |
| 濃度 | ~100 nM | |
| 反応時間 | 1 days | |
| 実験の流れ | Cells are seeded in duplicate at 5,000 to 10,000 cells per well in 24-well plates. The day after plating, different concentrations of Letrozole are added. At the end of incubation, cells are trypsinizated and placed in Isotone solution and counted immediately using a Coulter particle-counter. |
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| 動物実験 | 動物モデル | Human breast carcinoma xenografts MCF-7 with human aromatase gene (MCF-7Ca) |
| 投薬量 | 20 mg/kg/day | |
| 投与方法 | orally administered by gavage once every 2 days | |
参考
カスタマーフィードバック
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Data from [Data independently produced by PLoS One, 2014, 9(1), e85581]
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Data from [Data independently produced by Endocrinology, 2013, 154, 2296-307]
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Data from [Data independently produced by , , Clin Sci (Lond), 2018, 132(7):759-776]
Selleckの高級品が、幾つかの出版された研究調査結果（以下を含む）で使われた：
| CDK4/6 inhibitors induce breast cancer senescence with enhanced anti-tumor immunogenic properties compared with DNA-damaging agents [ Mol Oncol, 2023, 10.1002/1878-0261.13541] | PubMed: 37854019 |
| 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 |
| High p16 expression and heterozygousRB1loss are biomarkers for CDK4/6 inhibitor resistance in ER+breast cancer [ Nature Communications, 2022, 13, 5258] | PubMed: None |
| High p16 expression and heterozygous RB1 loss are biomarkers for CDK4/6 inhibitor resistance in ER+ breast cancer [ Nat Commun, 2022, 13-1:5258] | PubMed: 36071033 |
| Co-targeting CDK2 and CDK4/6 overcomes resistance to aromatase and CDK4/6 inhibitors in ER+ breast cancer [ NPJ Precis Oncol, 2022, 6(1):68] | PubMed: 36153348 |
| 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 |
| Reducing local synthesis of estrogen in the tubular striatum promotes attraction to same-sex odors in female mice [ Horm Behav, 2022, 140:105122] | PubMed: 35101702 |
| MCM3 upregulation confers endocrine resistance in breast cancer and is a predictive marker of diminished tamoxifen benefit [ NPJ Breast Cancer, 2021, 7(1):2] | PubMed: 33398005 |
| Establishment and characterization of NCC-MFS4-C1: a novel patient-derived cell line of myxofibrosarcoma [ Hum Cell, 2021, 34(6):1911-1918] | PubMed: 34383271 |
長期の保管のために-20°Cの下で製品を保ってください。
人間や獣医の診断であるか治療的な使用のためにでない。
各々の製品のための特定の保管と取扱い情報は、製品データシートの上で示されます。大部分のSelleck製品は、推薦された状況の下で安定です。製品は、推薦された保管温度と異なる温度で、時々出荷されます。長期の保管のために必要とされてそれと異なる温度で、多くの製品は、短期もので安定です。品質を維持するが、夜通しの積荷のために最も経済的な貯蔵状況を用いてあなたの送料を保存する状況の下に、製品が出荷されることを、我々は確実とします。製品の受領と同時に、製品データシートの上で貯蔵推薦に従ってください。