Letrozole

別名：CGS 20267

製品コード：S1235 純度：99.99%

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.

CAS No. 112809-51-5

サイズ	価格(税別)	在庫状況
25mg	JPY 22000	国内在庫あり
100mg	JPY 43000	国内在庫あり
1g	JPY 145500	国内在庫なし(納期7~10日)

代表番号: 045-509-1970\|電子メール：sales@selleck.co.jp よく尋ねられる質問

文献中Selleckの製品使用例（36）

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Letrozole関連製品

関連製品	Fadrozole (CGS16949A) Obacunone (AI3-37934)	もっと見る
関連化合物ライブラリー	FDA-approved Drug Library Natural Product Library Bioactive Compound Library-I Exosome Secretion Related Compound Library Human Hormone Related Compound Library	もっと見る

シグナル伝達経路

Aromataseシグナル伝達経路

Aromatase阻害剤の選択性比較

Cell Data

Cell Lines	Assay Type	Concentration	Incubation Time	活性情報	PMID
H295R	Function assay	5 uM	24 hrs	Inhibition of CYP19 in human H295R cells using [1beta-3H(N)]-androst-4-ene-3,17-dione at 5 uM after 24 hrs by tritiated water release assay	24025069
MDA-MB-231	Growth inhibition assay		72 hrs	Growth inhibition of human MDA-MB-231 cells incubated for 72 hrs by cell counting based method, GI50=10μM	30822713
MCF7	Growth inhibition assay		72 hrs	Growth inhibition of human MCF7 cells incubated for 72 hrs by cell counting based method, GI50=4.1μM	30822713
他の多くの細胞株試験データをご覧になる場合はこちらをクリックして下さい

生物活性

製品説明

Targets

Aromatase ^[1]
(Cell-free assay)

0.07 nM-20 nM

In Vitro
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]
Kinase Assay	Human placental aromatase activity
Kinase Assay	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.
細胞実験	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.

In Vivo
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]
動物実験	動物モデル	Human breast carcinoma xenografts MCF-7 with human aromatase gene (MCF-7Ca)
	投与量	20 mg/kg/day
	投与経路	orally administered by gavage once every 2 days

NCT Number	Recruitment	Conditions	Sponsor/Collaborators	Start Date	Phases
臨床試験 (data from https://clinicaltrials.gov, updated on 2024-05-22)
NCT06143631	Not yet recruiting	Leiomyoma Uterine\|Leiomyoma\|Fibroid\|Fibroid Uterus	University of California San Francisco\|Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)	May 13 2024	Phase 4
NCT05872204	Recruiting	Low Grade Serous Ovarian Carcinoma\|Adult Type Granulosa Cell Tumor	Universitaire Ziekenhuizen KU Leuven\|Kom Op Tegen Kanker\|Eli Lilly and Company\|European Network of Gynaecological Oncological Trial Groups (ENGOT)	November 30 2023	Phase 2

参考
[1] Haynes BP, et al. J Steroid Biochem Mol Biol, 2003, 87(1), 35-45. [2] Bhatnagar AS, et al. J Steroid Biochem Mol Biol, 1990, 37(6), 1021-1027. [3] Mitropoulou TN, et al. Int J Cancer, 2003, 104(2), 155-160. [4] Dellapasqua S, et al. Expert Opin Drug Metab Toxicol, 2010, 6(2), 251-259. [5] Lee K, et al. Int J Cancer, 1995, 62(3), 297-302. [6] Steele RE, et al. Steroids, 1987, 50(1-3), 147-161. + 展開

参考

+ 展開

化学情報

分子量	285.3	化学式	C₁₇H₁₁N₅
CAS No.	112809-51-5	SDF	Download Letrozole SDFをダウンロードする
Smiles	C1=CC(=CC=C1C#N)C(C2=CC=C(C=C2)C#N)N3C=NC=N3
保管	3年-20°C粉	溶液の保管冷凍と解凍の繰り返しを避けるため小分けにしてください	1年-80°Cin solvent
保管	3年-20°C粉	溶液の保管冷凍と解凍の繰り返しを避けるため小分けにしてください	１ケ月-20°Cin solvent

In vitro
Batch:

DMSO : 57 mg/mL ( (199.78 mM)；吸湿したDMSOは溶解度を減少させます。新しいDMSOをご使用ください。)

Water : Insoluble

Ethanol : Insoluble

モル濃度計算器

in vivo
Batch:

Add solvents to the product individually and in order.

投与溶液組成計算機

Clear solution

5% DMSO 1 95% Corn oil

0.45mg/ml (1.58mM)

Taking the 1 mL working solution as an example, add 50 μL of 9 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.

Clear solution

5%DMSO 1 40%PEG300 Click to order 2 5%Tween 80 Click to order 3 50%ddH2O

2.85mg/ml (9.99mM)

Taking the 1 mL working solution as an example, add 50 μL of 57 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.

実験計算

モル濃度計算器

質量	濃度	体積	分子量
=	×	×

希釈計算器分子量計算器

投与溶液組成計算機(クリア溶液)

ステップ１：実験データを入力してください。（実験操作によるロスを考慮し、動物数を1匹分多くして計算・調製することを推奨します）

投与量 mg/kg 動物平均体重 g 投与体積（動物毎）μL 動物数匹

ステップ２：投与溶媒の組成を入力してください。（ロット毎に適した溶解組成が異なる場合があります。詳細については弊社までお問い合わせください）

% DMSO + % + % Tween 80 + % ddH₂O

%DMSO+ %

計算結果：

投与溶媒濃度： mg/ml;

DMSOストック溶液調製方法： mg 試薬を μL DMSOに溶解する（濃度 mg/mL, 注：濃度が当該ロットのDMSO溶解度を超える場合はご連絡ください。 )

投与溶媒調製方法：Take μL DMSOストック溶液に μL PEG300，を加え、完全溶解後μL Tween 80，を加えて完全溶解させた後 μL ddH₂O，を加え完全に溶解させます。

投与溶媒調製方法：μL DMSOストック溶液に μL Corn oil，を加え、完全溶解。

注意：１.ストック溶液に沈殿、混濁などがないことをご確認ください；
２.順番通りに溶剤を加えてください。次のステップに進む前に溶液に沈殿、混濁などがないことを確認してから加えてください。ボルテックス、ソニケーション、水浴加熱など物理的な方法で溶解を早めることは可能です。

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