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CAS No. 257933-82-7
Pelitinib (EKB-569) is a potent irreversible EGFR inhibitor with IC50 of 38.5 nM. Pelitinib (EKB-569) also slightly inhibits Src, MEK/ERK and ErbB2 with IC50s of 282 nM, 800 nM and 1255 nM, respectively. Phase2.
Selleck's Pelitinib (EKB-569) has been cited by 7 publications
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HBMEC were preincubated with the indicated concentrations of either ErB1/2/4 inhibitor (Pelitinib; EKB-569), and cells were then infected for 4 h with the unencapsulated strain, MC58 siaD. The numbers of adherent (black bars) and invasive (gray bars) bacteria were determined in a gentamicin protection assay. The graphs show the percentages of adhesion and invasion of inhibitor-treated cells, relative to control cells (means 盨D of three independent experiments performed in duplicate). *, P < 0.05.
Infect Immun 2014 82(3), 1243-55. Pelitinib (EKB-569) purchased from Selleck.
IGF-1 and IL-1β mediated induction of Bcl-2 expression involves EGFR. (A) Bcl-2 mRNA levels in AALEBs treated with IGF-1 or IL-1β in the presence or absence of two EGFR tyrosine kinase inhibitors, EKB-569 (1 μM) or PD153035 (1 μM).
J Immunol 2012 188, 4581-4589. Pelitinib (EKB-569) purchased from Selleck.
Immunofluorescence Assay. PDCD4, GRA3, and overlapping are represented in red, green, and yellow, respectively. Group I TKIs sunitinib and AZD9291 show similar results to that of the negative control with PDCD4 and GRA3 well localized inside the nuclei. Mild disruption of PDCD4 in the nuclei is observed with Group II TKIs gefitinib, erlotinib, and AG1478. Group III TKIs neratinib, afatinib, and pelitinib show comparable changes to that of pyrimethamine 5 μM, with complete disruption of PDCD4 and GRA3, without any localization. The assays were repeated 3 times, and each experiment was performed in triplicate. A representative result is shown (x1,000).
Korean J Parasitol, 2017, 55(5):491-503. Pelitinib (EKB-569) purchased from Selleck.
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|Description||Pelitinib (EKB-569) is a potent irreversible EGFR inhibitor with IC50 of 38.5 nM. Pelitinib (EKB-569) also slightly inhibits Src, MEK/ERK and ErbB2 with IC50s of 282 nM, 800 nM and 1255 nM, respectively. Phase2.|
|Features||An improved version of EKI-785.|
Pelitinib displays much higher inhibitory activity against EGFR, compared with the closely related c-erbB-2, as well as other kinases such as Src, Cdk4, c-Met, Raf, and MEK/ERK, with IC50 ranging from 282 nM for Src to >20 μM for Cdk4. Consistently, Pelitinib treatment significantly inhibits the autophosphorylation of EGFR but not c-Met in A431 cells.  Pelitinib potently inhibits the proliferation of normal human keratinocytes (NHEK), as well as A431 and MDA-468 tumor cells with IC50 of 61 nM, 125 nM, and 260 nM, respectively, while displaying little activity against MCF-7 cells with IC50 of 3.6 μM. Pelitinib inhibits EGF-induced phosphorylation of EGFR in A431 and NHEK cells with IC50 of 20-80 nM, as well as the phosphorylation of STAT3 with IC50 of 30-70 nM. Pelitinib at 75-500 nM also specifically inhibits the activation of AKT and ERK1/2, without affecting NF-κB pathway. In NHEK cells, Pelitinib also potently inhibits TGF-α mediated EGFR activation with IC50 of 56 nM, as well as activation of STAT3 and ERK1/2 with IC50 of 60 nM and 62 nM, respectively. 
|In vivo||A single oral dose of 10 mg/kg Pelitinib potently inhibits the EGFR phosphorylation in A431 xenografts with over-expressed EGFR, by 90% within 1 hour, and by >50% after 24 hours. Administration of Pelitinib at 20 mg/kg/day inhibits tumorigenesis in APCMin/+ mice by 87%, equivalent to the effect of used with 2 times doses of EKI-785 (40 mg/kg/day), consistent with greater in vivo potency.  Pelitinib selectively inhibits EGFR signaling in airway epithelial cells in vivo. In the mouse model of airway epithelial remodeling that is inducible by viral infection and features a delayed but permanent switch to goblet cell metaplasia, Pelitinib treatment at 20 mg/kg/day corrects all 3 aspects of epithelial remodeling, by completely blocking the increase of ciliated cells and decrease of Clara cells, and significantly inhibiting the metaplasia of goblet cells. |
Autophosphorylation of EGFR in cells:For experiments using cells in culture, A431 cells are treated with various concentrations of Pelitinib for 2.75 hours before co-incubation with 100 ng/mL EGF for 0.25 hour. Cells are washed twice with cold phosphate-buffered saline (PBS) before adding to lysis buffer (10 mM Tris, pH 7.5, 5 mM ethylenediamine tetra-acetic acid (EDTA), 150 mM NaCl, 1% Triton X-100, 1% Sodium deoxycholate, 0.1 % SDS, 1 mM PMSF, 10 mg/mL pepstatin A, 10 mg/mL leupeptin, 20 KIU/mL aprotinin, 2 mM sodium orthovanadate, and 100 mM sodium fluoride) for 20 minutes on ice, before immunoprecipitation and SDS-PAGE-immunoblotting. For immunoprecipitation, cultured cells are placed in cold lysis buffer and immediately homogenized on ice with a polytron with several pulses. The homogenate is first centrifuged at 2500 rpm (20 minutes, 4 °C) and then again at 14,000 rpm in a microcentrifuge (10 minutes, 4 °C). Supernatants (1000 μg protein) are incubated for 2 hours at 4 °C with 15 mL of EGFR polyclonal antibody. After 2 hours, 50 μL of protein G plus/protein A agarose beads is added and incubated with constant rotation for 2 hours at 4 °C. After washing with lysis buffer, beads are boiled for 2 minutes in Laemmli sample buffer. Proteins are then resolved by SDS-PAGE, transferred to immobilon membrane and probed overnight with an anti-phosphotyrosine antibody conjugated with horseradish peroxidase (HRP). Membranes are developed using the ECL reagent. Total EGFR protein is determined by stripping membranes and re-probing with receptor-specific antibodies. Quantitation of bands is done by densitometry, using ImageQuant software with a Molecular Dynamics laser transmittance scanner.
|In vitro||DMSO||13 mg/mL (27.78 mM)|
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