Lapatinib Ditosylate is a selective and effective inhibitor of ErbB-2 and EGFR dual tyrosine kinases. ErbB-2 and EGFR dual tyrosine kinases are growth promoting factors that are over expressed in some breast cancer cell lines. Lapatinib inhibits the growth of both EGFR- and ErbB-2-overexpressing cells, whereas OSI-774 and Iressa which are EGFR selective inhibitors preferentially inhibit the growth of the EGFR-overexpressing cell lines. Research studies have reported that Lapatinib Ditosylate can inhibit breast cancer cell proliferation.
|Cell lines||HFF; BT474, MCF-7, N87, and CaLu-3; HN5, A-431, T47D, HB4a, and HB4a c5.2 cell lines|
|Preparation method||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.|
|Incubation time||3 days|
|Animal models||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|
|Formulation||sulfo-butyl-ether-β-cyclodextrin 10% aqueous solution (CD10)|
|Dosages||30 or 100 mg/kg twice daily for 21 days|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
|Solubility||DMSO 100 mg/mL|
|Source||Int J Pharm Pharm Sci (2016). Figure 3.Lapatinib (Abmole)|
|Incubation Time||1~21 days|
|Results||No significant changes in the vaginal pH were observed between control and treated animals throughout the three phases of the estrous cycle. Even though, on the 12th d, prolonged diestrus phase in treated group animals was evidenced with the vaginal pH as compared with the control mice [fig. 3].|
J Pharm Pharm Sci 2016 Feb;404-407.
Phase dependent discrepancy in murine vaginal micro-environment: A correlative analysis of PH, glycogen and Serum Estrogen upon exposure to Lapatinib Ditosylate
Lapatinib Ditosylate purchased from AbMole
Phase I pharmacokinetic and pharmacodynamic study of lapatinib in combination with sorafenib in patients with advanced refractory solid tumors.
Simonelli M, et al. Eur J Cancer. 2012 Nov 9. PMID: 23146956.
Lapatinib plus capecitabine in patients with previously untreated brain metastases from HER2-positive metastatic breast cancer (LANDSCAPE): a single-group phase 2 study.
Bachelot T, et al. Lancet Oncol. 2012 Nov 1. PMID: 23122784.
PI3K independent activation of mTORC1 as a target in lapatinib-resistant ERBB2+ breast cancer cells.
Jegg AM, et al. Breast Cancer Res Treat. 2012 Oct 23. PMID: 23089982.
Phase I and pharmacokinetic study of pazopanib and lapatinib combination therapy in patients with advanced solid tumors.
de Jonge MJ, et al. Invest New Drugs. 2012 Oct 6. PMID: 23054212.
The effects of the novel, reversible epidermal growth factor receptor/ErbB-2 tyrosine kinase inhibitor, GW2016, on the growth of human normal and tumor-derived cell lines in vitro and in vivo.
Rusnak DW, et al. Mol Cancer Ther. 2001 Dec;1(2):85-94. PMID: 12467226.
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