Catalog No.S2111 Synonyms: GW-572016, GSK572016
Molecular Weight(MW): 581.06
Lapatinib, used in the form of Lapatinib Ditosylate, is a potent EGFR and ErbB2 inhibitor with IC50 of 10.8 and 9.2 nM in cell-free assays, respectively.
Cited by 38 Publications
7 Customer Reviews
Sensitivity to the ErbB1/ErbB2 inhibitor lapatinib is highest for cancer cells from late-stage tumors in culture (mean ± SEM, p = 0.04 or 0.02 as indicated, Student’s t test; values represent the averages of four experiments, each done in triplicate with primary cells from independent mice).
Cancer Cell 2012 21(4), 488-503. Lapatinib purchased from Selleck.
Inhibition of HER2 using siRNAs show a similar response measured by induced apoptosis, decreased proliferation and decreased phospho-p70-S6K staining as Lapatinib mono-treatment and combinatorial treatment with Lapatinib and trastuzumab. Trastuzumab mono-treatment is less efﬁcient than siHER2.
Mol Oncol 2013 7(3), 392-401. Lapatinib purchased from Selleck.
Lapatinib effectively inhibits EGFR activation, leading to a reduc- tion in STAT1 expression. MDA-MB-468 cells with endogenous expression of EGFR and STAT3 were treated with 25 μM lapatinib for 24 h, harvested and subjected to western blotting for EGFR, p-EGFR, and STAT1 expression.
Mol Carcinog 2013 52(12), 959-69. Lapatinib purchased from Selleck.
Endogenous associations between STAT1, EGFR, and p-STAT3 expression in breast cancer cells. (B) Lapatinib effectively inhibits EGFR activation, leading to a reduction in STAT1 expression. MDA-MB-468 cells with endogenous expression of EGFR and STAT3 were treated with 25 uM lapatinib for 24 h, harvested and subjected to western blotting for EGFR, p-EGFR, and STAT1 expression.
Mol Carcinog 2012 52, 959-69. Lapatinib purchased from Selleck.
Combination treatment with lapatinib and CZ0775 significantly induces pro-apoptotic BIM proteins in H195 cells. HCC827 (a) and H1975 (b) cells were treated with either 1 μM lapatinib alone or the combination of 1 μM lapatinib plus 1 μM AZD6244 or CZ0775 for 24 h. Cell lysates were analyzed by Western blotting using the indicated antibodies. The levels of β -actin served as a loading control
Acta Pharmacol Sin 2013 10.1038/aps.2013.124. Lapatinib purchased from Selleck.
EGF and TGF-α-induced CD44 expression is reduced by EGFR inhibitors in SKBR3 breast cancer cells. After serum-starvation for 24 h, the cells were pretreated with EGFR inhibitors, AG1478 or lapatinib for 30 min prior to EGF or TGF-α treatment and then, treated with EGF (A) or TGF-α (B) for 24 h. The level of CD44 mRNA expression was analyzed by real-time PCR. After serum-starvation for 24 h, the cells were pretreated with AG1478 or lapatinib for 30 min prior to EGF or TGF-α treatment and then treated with EGF for 24 h (C). The levels of CD44, EGFR, ERK, and β-actin protein expression were analyzed by Western blotting.
Anticancer Res 2011 31, 3767-3774. Lapatinib purchased from Selleck.
Purity & Quality Control
Choose Selective EGFR Inhibitors
|Description||Lapatinib, used in the form of Lapatinib Ditosylate, is a potent EGFR and ErbB2 inhibitor with IC50 of 10.8 and 9.2 nM in cell-free assays, respectively.|
Lapatinib weakly inhibits the activity of ErbB4 with IC50 of 367 nM, and displays >300-fold selectivity for EGFR and ErbB2 over other kinases such as c-Src, c-Raf, MEK, ERK, c-Fms, CDK1, CDK2, p38, Tie-2, and VEGFR2. Lapatinib significantly inhibits receptor autophosphorylation of EGFR and ErbB2 in a dose-dependent manner with IC50 of 170 nM and 80 nM, respectively in HN5 cells; as well as 210 nM and 60 nM, respectively in BT474 cells. Unlike OSI-774 and Iressa (ZD1839) which preferentially inhibit the growth of the EGFR-overexpressing cells, Lapatinib inhibits the growth of both EGFR- and ErbB2-overexpressing cells. Lapatinib displays higher inhibitory activity against EGFR- or ErbB2-overexpressing cells with IC50 of 0.09-0.21 μM, compared with cells expressing low levels of EGFR or ErbB2 with IC50 of 3-12 μM, and exhibits ~100-fold selectivity over the normal fibroblast cells. Lapatinib potently inhibits the outgrowth of EGFR-overexpressing HN5 and A-431 cells, as well as ErbB2-overexpressing BT474 and N87 cells, and significantly induces G1 arrest of HN5 cells and apoptosis of BT474 cells, which are associated with inhibition of AKT phosphorylation. 
|In vivo||Oral administration of Lapatinib (~100 mg/kg) twice daily significantly inhibits the growth of BT474 and HN5 xenografts in a dose-dependent manner. |
In vitro kinase assays:The IC50 values for inhibition of enzyme activity are generated by measuring inhibition of phosphorylation of a peptide substrate. The intracellular kinase domains of EGFR and ErbB2 are purified from a baculovirus expression system. EGFR and ErbB2 reactions are performed in 96-well polystyrene round-bottomed plates in a final volume of 45 μL. Reaction mixtures contain 50 mM 4-morpholinepropanesulfonic acid (pH 7.5), 2 mM MnCl2, 10 μM ATP, 1 μCi of [γ33P] ATP/reaction, 50 μM Peptide A [Biotin-(amino hexonoic acid)-EEEEYFELVAKKK-CONH2], 1 mM dithiothreitol, and 1 μL of DMSO containing serial dilutions of Lapatinib beginning at 10 μM. The reaction is initiated by adding the indicated purified type-1 receptor intracellular domain. The amount of enzyme added is 1 pmol/reaction (20 nM). Reactions are terminated after 10 minutes at 23°C by adding 45 μL of 0.5% phosphoric acid in water. The terminated reaction mix (75 μL) is transferred to phosphocellulose filter plates. The plates are filtered and washed three times with 200 μL of 0.5% phosphoric acid. Scintillation cocktail (50 μL) is added to each well, and the assay is quantified by counting in a Packard Topcount. IC50 values are generated from 10-point dose-response curves.
|In vitro||DMSO||100 mg/mL (172.09 mM)|
|In vivo||Add solvents individually and in order:
2% DMSO+30% PEG 300+5% Tween 80+ddH2O
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT00107003||Completed||Glioma|Brain Tumor|Glioblastoma Multiforme|GBM|Gliosarcoma|GS||National Cancer Institute (NCI)|National Institutes of Health Clinical Center (CC)||March 30, 2005||Phase 2|
|NCT00251433||Active, not recruiting||Neoplasms, Breast||Novartis Pharmaceuticals|Novartis||September 26, 2005||Phase 1|
|NCT01306045||Recruiting||Carcinoma, Non-Small-Cell Lung|Carcinoma, Small Cell Lung|Carcinoma, Thymic||National Cancer Institute (NCI)|National Institutes of Health Clinical Center (CC)||January 21, 2011||Phase 2|
|NCT03052634||Recruiting||Advanced Breast Cancer||RemeGen||November 2016||Phase 1|Phase 2|
|NCT02836847||Recruiting||Cholangiocarcinoma of the Extrahepatic Bile Duct|Gallbladder Cancer||Shanghai Jiao Tong University School of Medicine|Xinhua Hospital, Shanghai Jiao Tong University School of Medicine|Ruijin Hospital|RenJi Hospital|Eastern Hepatobiliary Surgery Hospital|Huashan Hospital||July 2016||Phase 2|
|NCT02650752||Recruiting||Metastatic Breast Cancer|Central Nervous System (CNS) Metastases||Memorial Sloan Kettering Cancer Center|Queens Cancer Center of Queens Hospital|University of Michigan||January 2016||Phase 1|
Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.
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