Lapatinib (GW-572016) Ditosylate是一种有效的EGFR和ErbB2抑制剂,IC50分别为10.8和9.2 nM。
别名:Tykerb
Lapatinib (GW-572016) Ditosylate是一种有效的EGFR和ErbB2抑制剂,IC50分别为10.8和9.2 nM。Lapatinib有效抑制过量表达EGFR的HN5和A-431细胞生长,也抑制过量表达ErbB2的BT474和N87细胞生长,且显著诱导HN5细胞周期停在G1期,也诱导 BT474 细胞凋亡,与抑制AKT磷酸化相关。Lapatinib 作用于含EGFR的L858R和T790M突变的抗Gefitinib的H1975细胞显著抑制Stat3磷酸化,导致细胞生长受抑制,IC50为1-2 μM。Lapatinib 按~100 mg/kg剂量口服处理,每天两次,显著抑制BT474和HN5移植瘤生长,这种作用存在剂量依赖性。与在体外活性一致,Lapatinib按100-150 mg/kg剂量处理携带H1975肿瘤的小鼠,延迟肿瘤生长。
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体外实验* | |
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细胞系 | HFF; BT474, MCF-7, N87, and CaLu-3; HN5, A-431, T47D, HB4a, and HB4a c5.2 cell lines |
方法 | In Vitro Growth Inhibition Assays For assessment of cell-based potency, cells were plated in 96-well Falcon plates (Becton Dickinson) in the growth media described above. Plating densities that resulted in logarithmic growth of vehicle-treated cells for the duration of the assay were used: HFF, 15,000 cells/cm2; BT474, MCF-7, N87, and CaLu-3, 30,000 cells/cm2; and HN5, A-431, T47D, HB4a, and HB4a c5.2, 10,000 cells/cm2. After 24 h, cells were exposed to compounds at the concentrations indicated in Fig. 2. HFF, BT474, HN5, and N87 cells were treated in low-glucose DMEM containing 5% FBS, 50 μg/ml gentamicin, and 0.3% v/v DMSO. MCF-7 cells were treated in 50% high-glucose DMEM, 50% low-glucose DMEM containing 5% FBS, 50 μg/ml gentamicin, and 0.3% v/v DMSO. T47D, A-431, and CaLu-3 cells were treated in 50% RPMI, 50% low-glucose DMEM containing 5% FBS, 50 μg/ml gentamicin, and 0.3% v/v DMSO. HB4a and HB4a c5.2 cells were treated in 50% DMEM, 50% RPMI 1640 supplemented with 5% FBS, 2.5 μg/ml hydrocortisone, 2.5 μg/ml insulin, 25 μg/ml hygromycin B, 50 μg/ml gentamicin, and 0.3% v/v DMSO. After 3 days, relative cell number was estimated using methylene blue staining. The media were removed, and 100 μl of 0.5% w/v methylene blue dissolved in 50% ethanol and 50% water were added to each well. Plates were washed by immersion in deionized water and allowed to air dry. 1% w/v n-lauroylsarcosine (100 μl) dissolved in PBS was added to each well, and plates were incubated for 30 min at room temperature. The absorbance at 620 nm was read in a Spectra (Tecan) microplate reader. Data were analyzed using curve-fitting macros written for Microsoft Excel. Concentrations with IC50 were interpolated using the method of Levenberg and Marquardt and this equation: y = Vmax × [1 − (xn/(Kn + xn))], where “K” is equal to IC50. |
浓度 | 0~100 μM |
处理时间 | 3 days |
*上述方法来自公开文献,仅供相同目的实验参考。如实验目的、材料、方法不同,请参考其他文献。
体内实验* | |
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动物模型 | CD-1 nude female mice were used for HN5 human tumor xenografts, C.B-17 SCID female mice were used for BT474 human tumor xenografts |
配制 | sulfo-butyl-ether-β-cyclodextrin 10% aqueous solution (CD10) |
剂量 | 30 or 100 mg/kg twice daily for 21 days |
给药处理 | p.o. |
*上述方法来自公开文献,仅供相同目的实验参考。如实验目的、材料、方法不同,请参考其他文献。
分子量 | 925.46 |
分子式 | C29H26ClFN4O4S.2C7H8O3S |
CAS号 | 388082-78-8 |
溶解性(25°C) | DMSO 90 mg/mL |
储存条件 | -20°C, sealed, protect from light |
运输方式 | 冰袋运输,根据产品的不同,可能会有相应调整。 |
*下述溶液配置方法仅为基于分子量计算出的理论值。不同产品在配置溶液前,需考虑其在不同溶剂中的溶解度限制。
Concentration / Solvent Volume / Mass | 1 mg | 5 mg | 10 mg |
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1 mM | 1.0805 mL | 5.4027 mL | 10.8054 mL |
5 mM | 0.2161 mL | 1.0805 mL | 2.1611 mL |
10 mM | 0.1081 mL | 0.5403 mL | 1.0805 mL |
小鼠 | 大鼠 | 兔 | 豚鼠 | 仓鼠 | 狗 | |
重量 (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
体表面积 (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
Km 系数 | 3 | 6 | 12 | 8 | 5 | 20 |
动物 A (mg/kg) = 动物 B (mg/kg) × | 动物 B的Km系数 |
动物 A的Km系数 |
例如,依据体表面积折算法,将化合物用于小鼠的剂量20 mg/kg 换算成大鼠的剂量,需要将20 mg/kg 乘以小鼠的Km系数(3),再除以大鼠的Km系数(6),得到化合物用于大鼠的等效剂量为10 mg/kg。
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