Lapatinib Ditosylate

Catalog No.S1028 Batch:S102811

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Technical Data

Formula

C29H26ClFN4O4S.2C7H8O3S
Molecular Weight 925.46 CAS No. 388082-77-7
Solubility (25°C)* In vitro DMSO 100 mg/mL (108.05 mM)
Water Insoluble
Ethanol Insoluble
* <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.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

Preparing Stock Solutions

Biological Activity

Description Lapatinib Ditosylate is a potent EGFR and ErbB2 inhibitor with IC50 of 10.8 and 9.2 nM in cell-free assays, respectively.
Targets
ErbB2 [1]
(Cell-free assay)		 EGFR [1]
(Cell-free assay)		 ErbB4 [1]
(Cell-free assay)
9.2 nM 10.8 nM 367 nM
In vitro Lapatinib Ditosylate 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 Ditosylate 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 Ditosylate inhibits the growth of both EGFR- and ErbB2-overexpressing cells. Lapatinib Ditosylate 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 Ditosylate 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. [1]
In vivo Oral administration of Lapatinib Ditosylate (~100 mg/kg) twice daily significantly inhibits the growth of BT474 and HN5 xenografts in a dose-dependent manner. [1]

Protocol (from reference)

Kinase Assay:[1]
  • 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.
Cell Assay:[1]
  • Cell lines

    HFF, MCF-7, T47D, A-431, HN5, BT474, N87, CaLu-3, HB4a, and HB4a c5.2

  • Concentrations

    Dissolved in DMSO, final concentrations ~100 μM

  • Incubation Time

    72 hours

  • Method

    Cells are exposed to various concentrations of Lapatinib for 72 hours. Relative cell number is estimated using methylene blue staining. The absorbance at 620 nm is read in a Spectra microplate reader. Cell death and cell cycle analysis are assessed by propidium iodide staining and antibody detection of incorporated BrdUrd and staining with propidium iodide.
Animal Study:[1]
  • Animal Models

    CD-1 nude female mice implanted s.c. with HN5 cells, and C.B-17 SCID female mice implanted s.c. with BT474 cells

  • Dosages

    ~100 mg/kg

  • Administration

    Orally twice daily

Customer Product Validation

Data from [Mol Cancer Ther, 2011, 10:697-707]

Data from [Biochem Pharmacol, 2011, 82, 1457-1466]

Data from [Biochem Pharmacol, 2011, 82, 1457-1466]

Data from [Int J Proteomics, 2011, 2011, 215496]

Selleck's Lapatinib Ditosylate has been cited by 149 publications

Altered ribosomal profile in acquired resistance and reversal associates with pathological response to chemotherapy in inflammatory breast cancer [ NPJ Breast Cancer, 2024, 10(1):65] PubMed: 39075068
Profiling of ERBB receptors and downstream pathways reveals selectivity and hidden properties of ERBB4 antagonists [ iScience, 2024, 27(2):108839] PubMed: 38303712
Protocol for identifying properties of ERBB receptor antagonists using the barcoded ERBBprofiler assay [ STAR Protoc, 2024, 5(2):102987] PubMed: 38635397
Proteomic Assessment of SKBR3/HER2+ Breast Cancer Cellular Response to Lapatinib and Investigational Ipatasertib Kinase Inhibitors [ bioRxiv, 2024, 2024.04.02.587656] PubMed: 38617302
Overcoming brain-derived therapeutic resistance in HER2+ breast cancer brain metastasis [ bioRxiv, 2024, 2024.02.19.581073] PubMed: 38529509
Analysis and modeling of cancer drug responses using cell cycle phase-specific rate effects [ Nat Commun, 2023, 14(1):3450] PubMed: 37301933
HDAC Inhibition Restores Response to HER2-Targeted Therapy in Breast Cancer via PHLDA1 Induction [ Int J Mol Sci, 2023, 24(7)6228] PubMed: 37047202
Integrin αvβ3 Is a Master Regulator of Resistance to TKI-Induced Ferroptosis in HER2-Positive Breast Cancer [ Cancers (Basel), 2023, 15(4)1216] PubMed: 36831558
Oncogenic ERRB2 signals through the AP-1 transcription factor to control mesenchymal-like properties of oesophageal adenocarcinoma [ NAR Cancer, 2023, 5(1):zcad001] PubMed: 36694726
Genetic Deletion of the LINC00520 Homolog in Mouse Aggravates Angiotensin II-Induced Hypertension [ Noncoding RNA, 2023, 9(3)31] PubMed: 37218991

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

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