Letrozole

别名: CGS 20267 中文名称:来曲唑

Letrozole是第三代aromatase抑制剂,无细胞试验中IC50为0.07-20 nM。在临床研究中,对17α-OH progesterone、TSH、促黄体激素、促卵泡激素或雄烯二酮的血浆浓度没有作用,不影响正常的尿电解质排泄或甲状腺功能。Letrozole 可诱导自噬。

Letrozole Chemical Structure

Letrozole Chemical Structure

CAS: 112809-51-5

规格 价格 库存 购买数量
10mM (1mL in DMSO) RMB 3930.28 现货
25mg RMB 814.34 现货
100mg RMB 2350.53 现货
1g RMB 7944.3 现货
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客户使用Selleck的Letrozole发表文献34

产品质控

批次: 纯度: 99.99%
99.92

Letrozole相关产品

相关信号通路图

Aromatase抑制剂选择性比较

细胞实验数据示例

细胞系 实验类型 给药浓度 孵育时间 活性描述 文献信息
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
MCF7 Cytotoxicity assay 48 hrs Cytotoxicity against human MCF7 cells after 48 hrs by MTT assay, IC50=4.73μM 29202405
T47D Function assay 24 hrs Inhibition of aromatase activity in human T47D cells after 24 hrs, IC50=29.5μM 27770735
T47D Function assay 24 hrs Inhibition of aromatase activity in human T47D cells after 24 hrs, IC50=29.5μM 28427017
insect cells Function assay 30 mins Inhibition of recombinant human CYP19 expressed in baculovirus infected insect cells using MFC as substrate measured after 30 mins by fluorometric analysis, IC50=0.0053μM 27647367
MCF7 Cytotoxicity assay 24 to 96 hrs Cytotoxicity against human MCF7 cells after 24 to 96 hrs, IC50=0.02μM 24345481
MCF-7aro Function assay 1 hr Inhibition of aromatase in human MCF-7aro cells using [1beta-3H] androstenedione as substrate incubated for 1 hr by liquid scintillation counting method, IC50=0.0019μM 31732252
MCF7 Cytotoxicity assay 72 hrs Cytotoxicity against estrogen-dependent human MCF7 cells after 72 hrs by MTT assay, IC50=0.007μM 24345481
MCF7a Cytotoxicity assay 10 days Cytotoxicity against human MCF7a cells expressing Tet-off-3betaHSD1-Arom assessed as inhibition of TST-stimulated cell proliferation measured after 10 days, EC50=0.000004μM 22951074
OVCAR3 Growth inhibition assay 48 hrs Growth inhibition of human OVCAR3 cells after 48 hrs by sulforhodamine B assay, GI50=5.87μM 20950898
OVCAR8 Growth inhibition assay 48 hrs Growth inhibition of human OVCAR8 cells after 48 hrs by sulforhodamine B assay, GI50=4.5μM 20950898
Hs 578T Growth inhibition assay 48 hrs Growth inhibition of human Hs 578T cells after 48 hrs by sulforhodamine B assay, GI50=2.17μM 20950898
OVCAR5 Growth inhibition assay 48 hrs Growth inhibition of human OVCAR5 cells after 48 hrs by sulforhodamine B assay, GI50=1.62μM 20950898
MDA-N Growth inhibition assay 48 hrs Growth inhibition of human MDA-N cells after 48 hrs by sulforhodamine B assay, GI50=1.61μM 20950898
NCI/ADR-RES Growth inhibition assay 48 hrs Growth inhibition of human NCI/ADR-RES cells after 48 hrs by sulforhodamine B assay, GI50=1.16μM 20950898
SKOV3 Growth inhibition assay 48 hrs Growth inhibition of human SKOV3 cells after 48 hrs by sulforhodamine B assay, GI50=1.09μM 20950898
BT549 Growth inhibition assay 48 hrs Growth inhibition of human BT549 cells after 48 hrs by sulforhodamine B assay, GI50=0.89μM 20950898
OVCAR4 Growth inhibition assay 48 hrs Growth inhibition of human OVCAR4 cells after 48 hrs by sulforhodamine B assay, GI50=0.88μM 20950898
MCF7 Growth inhibition assay 48 hrs Growth inhibition of human MCF7 cells after 48 hrs by sulforhodamine B assay, GI50=0.7μM 20950898
T47D Growth inhibition assay 48 hrs Growth inhibition of human T47D cells after 48 hrs by sulforhodamine B assay, GI50=0.44μM 20950898
MDA-MB-231 Growth inhibition assay 48 hrs Growth inhibition of human MDA-MB-231cells after 48 hrs by sulforhodamine B assay, GI50=0.15μM 20950898
IGROV1 Growth inhibition assay 48 hrs Growth inhibition of human IGROV1 cells after 48 hrs by sulforhodamine B assay, GI50=0.095μM 20950898
MDA-MB-435 Growth inhibition assay 48 hrs Growth inhibition of human MDA-MB-435 cells after 48 hrs by sulforhodamine B assay, GI50=0.067μM 20950898
insect cells Function assay 30 mins Inhibition of human recombinant aromatase expressed in baculovirus infected insect cells using O-benzylfluorescein benzyl ester as substrate after 30 mins, IC50=0.0011μM ChEMBL
insect cells Function assay Inhibition of recombinant human aromatase expressed in baculovirus infected insect cells using O-benzyl fluorescein benzyl ester as substrate in presence of NADPH generating system by fluorescence based analysis, IC50=0.0019μM 31416738
JEG-3 Function assay Inhibition of aromatase (unknown origin) expressed in JEG-3 cells, IC50=0.00089μM 25992880
V79MZh Function assay Inhibition of human CYP11B1 expressed in hamster V79MZh cells using [1,2-3H]-11-deoxy-corticosterone as substrate, IC50=2.62μM 23281812
V79MZh Function assay Inhibition of human CYP11B2 expressed in hamster V79MZh cells using [1,2-3H]-11-deoxy-corticosterone as substrate, IC50=1.42μM 23281812
JEG3 Function assay Inhibition of aromatase activity in human JEG3 cells, IC50=0.00089μM 18590272
JEG3 Function assay Inhibition of aromatase in human JEG3 cells by scintillation spectrometry, IC50=0.00089μM 20148564
点击查看更多细胞系数据

生物活性

产品描述 Letrozole是第三代aromatase抑制剂,无细胞试验中IC50为0.07-20 nM。在临床研究中,对17α-OH progesterone、TSH、促黄体激素、促卵泡激素或雄烯二酮的血浆浓度没有作用,不影响正常的尿电解质排泄或甲状腺功能。Letrozole 可诱导自噬。
靶点
Aromatase [1]
(Cell-free assay)
0.07 nM-20 nM
体外研究(In Vitro)
体外研究活性

Letrozole有效抑制不同来源的芳香酶,包括人胎盘微粒体,人乳腺癌颗粒部分,大鼠卵巢微粒体,转染芳香酶的MCF-7细胞(MCF-7Ca),JEG-3绒膜癌细胞,CHO细胞,仓鼠卵巢组织,人乳腺癌颗粒部分,IC50分别是11, 2, 7, 0.07, 0.07, 1.4, 20和 0.8 nM。在非细胞系统中,letrozole 的IC50是1-13 nM。[1]Letrozole在LH诱导的仓鼠卵巢组织中抑制雌二醇产生,IC50 是0.02 μM,达到350 μM浓度时,不显著影响孕酮的产生。在ACTH诱导的大鼠肾组织中,抑制醛甾酮的产生,IC50 是210 μM. [2] Letrozole以剂量依赖的方式抑制MCF-7乳腺癌细胞的生长,IC50是1 nM。在低浓度下(0.1 nM)抑制作用依然可以观测到。letrozole 处理MCF-12A不影响生长,即使letrozole 浓度达到 (100 nM)或者延长培养时间。Letrozole (10 nM) 显著抑制4-雄甾烯-3,17-二酮(100 nM) 或者睾酮 (100 nM) 对MCF-7在细胞增殖方面的激活作用。联合使用17-β-雌二醇和letrozole (10 nM)降低由雌二醇诱导的MMP-2和MMP-9的活化作用。[3]

激酶实验 人类胎盘芳香酶活性
反应在37℃条件下,总体积为1 mL的体系中进行。孵育的混合物包含11 nM [4- 14C] 雄甾烯-3, 17-二酮([4- 14C]A),24 mM NADPH (焦磷酸钠盐III型),适当浓度的化合物,120 μg微粒体蛋白。(4- 14C)A用含有1.7% 溶解,溶于的0.05 M 磷酸钾缓冲液 (pH 7.4)溶解,乙醇终浓度不超过0.02%。加入酶触发反应,20分钟后加入7倍体积乙酸乙酯终止反应。混合物震荡,600g离心5分钟。用7倍体积的乙酸乙酯重新提起,混合两次所得样品,Evapo-Mix蒸干。用这种方法,99%的[4- 14C]的放射性能够保留。获得的残渣溶于150ul丙酮,取100ul做65分钟的薄层层析,用体积比为140:60的乙酸乙酯:异辛烷或者体积比为70:140:20(系统B)。用Berthold LB 2760定位放射性区域。放射性标记的雌二醇和孕酮通过与标准品比对来确认。硅胶结合的条带转移到10ml闪烁缓冲液中,用6880液体闪烁法系统计数。
细胞实验 细胞系 人类乳腺癌细胞 MCF-7
浓度 ~100 nM
孵育时间 1天
方法

细胞以5,000 到10,000个每孔的密度接种于24孔板上,第二天,加入不同浓度的Letrozole。孵育末期,细胞用胰酶消化,用Coulter particle计数器计数。

体内研究(In Vivo)
体内研究活性

在体内实验中, Letrozole抑制芳香酶活性,口服ED50 是1-3 微克/毫克。[2] Letrozole具有抗内分泌效果。在未成年大鼠体内,Letrozole抑制雄烯二酮引起的子宫肥大,ED50 为1-3 微克/千克。在成年雌性大鼠体内,Letrozole (0.3-1 毫克/千克 每天 口服,14 天)完全打断卵巢周期,并降低子宫重量和血清雌二醇(E2)浓度,使其与切除卵巢后的水平相同。[1] Letrozole诱导剂量依赖的雌激素依赖的抑制9,10-二甲苯-a-蒽诱导的雌性大鼠的肿瘤。Letrozole 的ED50是10-30 微克/千克/天,完全抑制的剂量是10微克/天。[4]

动物实验 Animal Models 含有人类芳香化酶基因(MCF-7Ca)的人类乳腺癌异种移植MCF-7
Dosages 20毫克/千克/天
Administration 口服
NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
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

化学信息&溶解度

分子量 285.3 分子式

C17H11N5

CAS号 112809-51-5 SDF Download Letrozole SDF
Smiles C1=CC(=CC=C1C#N)C(C2=CC=C(C=C2)C#N)N3C=NC=N3
储存条件(自收到货起)

体外溶解度
批次:

DMSO : 57 mg/mL ( 199.78 mM; DMSO吸湿会降低化合物溶解度,请使用新开封DMSO)

Water : Insoluble

Ethanol : Insoluble

摩尔浓度计算器

体内溶解度
批次:

现配现用,请按从左到右的顺序依次添加,澄清后再加入下一溶剂

动物体内配方计算器

实验计算

摩尔浓度计算器

质量 浓度 体积 分子量

动物体内配方计算器(澄清溶液)

第一步:请输入基本实验信息(考虑到实验过程中的损耗,建议多配一只动物的药量)

mg/kg g μL

第二步:请输入动物体内配方组成(配方适用于不溶于水的药物;不同批次药物配方比例不同,请联系Selleck为您提供正确的澄清溶液配方)

% DMSO % % Tween 80 % ddH2O
%DMSO %

计算结果:

工作液浓度: mg/ml;

DMSO母液配制方法: mg 药物溶于μL DMSO溶液(母液浓度mg/mL,:如该浓度超过该批次药物DMSO溶解度,请先联系Selleck);

体内配方配制方法:μL DMSO母液,加入μL PEG300,混匀澄清后加入μL Tween 80,混匀澄清后加入μL ddH2O,混匀澄清。

体内配方配制方法:μL DMSO母液,加入μL Corn oil,混匀澄清。

注意:1. 首先保证母液是澄清的;
2.一定要按照顺序依次将溶剂加入,进行下一步操作之前必须保证上一步操作得到的是澄清的溶液,可采用涡旋、超声或水浴加热等物理方法助溶。

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