Gefitinib(Iressa)

Breast cancer cells were pretreated with 100ng/ml EGF for 15 min and then treated with the indicated concentrations of Gefitinib for 24 hours.

MTT assay result. 0-500nM Gefitinib treated with H1299, H358, H25 and HCC827 cell lines by 72h, Proliferation rate was tested.

Effects of shRNA-mediated RECK depletion on EGFR signaling in MEFs. (a) Immunoblotting (IB) of the indicated proteins in wild-type MEFs transduced with the indicated shRNAs and cultured for 48 h in the presence of 0.1% dimethyl sulfoxide (DMSO; vehicle) or 1 mM gefitinib (S1025, Selleck Chemicals,Houston, TX, USA). (b) Immunoprecipitation from whole lysates of cells from panel a with an anti-phosphorylated tyrosine (pTyr) antibody. Precipitates from 500 mg protein in whole cell lysates (upper) or 20 mg protein in whole cell lysates (lower) were analyzed by IB with anti-EGFR antibody.

Suppression of EGFR signaling by Gefitinib is dose dependent and non- toxic at millimolar concentrations.Results from plaque reduction tests of Hep2 cells infected with VACV(12.5pfu/well) treated with a serial dilution of Gefitinib (1000–0.01 m) and analyzed for (A)proliferation as indicator of cytotoxicity,(B) IC50 of plaque size inhibition, (C)dose dependent inhibition of EGFR-ERK1/2signal- ing and VACV proteins by Western blot analysis (pEGFR detection was obtained from a different experiment with identicals ettings) and (D)dose dependent inhibition of orthopoxvirus genome replication by real-time PCR.Untreated VACV infectedcells and uninfected cells are shown as controls in the right panel.

A circular zone of EGFR activated but uninfected cells facilitate virus induced plaque development , efficiently blocked by Gefitinib. (A)Immun of luorescent staining of aplaque reduction tests with Hep2 cells 24,48,72 and 96 h after VACV infection (6.25pfu/chamber). VACV infected cells(green) were visualized by human IgG directed to orthopoxviruses (VIG) detected with a secondary FITC labelled antibody. Uninfected cells with activated EGFR signaling(red) are detected with a secondary Cy3labelled antibody. Positive cells for both , VACV and phosphorylated EGFR are shown in yellow(merge). Cellular nuclei are counterstained with DAPI. (B)Immunofluorescent staining of a plaque reduction test as described for (A) and treated with three different Gefitinib concentrations (1000 m, 1 m, and0.01 m) . The test was analyzed 96h afterVACV infection.Uninfected cells are shown as controls. Magnification100×.(For interpretation of the references to color in this figure legend , the reader is referred to the web version of the article.)

Perturbation of EGFR by its ligand EGF and gefitinib (ZD-1839 Iressat; inhibits EGFR) produces opposite responses in the predicted EGFR target genes SOCS2 and NR2E1.

Inhibition of signaling pathway activation in lung tumor cell lines by kinase inhibitors. Lung tumor cells were cultured in 10% FBS until reaching ∼80% confluence and then the cells were starved in serum-free medium for overnight, followed by 4-hour treatment with the inhibitors. Cell lysates were then prepared and used for determination of the pathway activation signals by the CEER assay.

(B–C) LNCaP (B) and LNCaP-AI (C) cells were transiently transfected with sPLA2-IIa(-800)-Luc (0.5 lg). The cells were then treated with Erlotinib (20 lM), Gefitinib (20 lM), Lapatinib (20 lM), CI-1033 (8 lM), LY294002 (20 lM) and Bortezomib (20 lM) without or with EGF (100 ng/ml) for 24 h. Luciferase assay was performed according to a standard protocol with Renilla luciferase as an internal control. Data are presented as the mean (±SD) of duplicate values of a representative experiment that was independently repeated for five times.

LNCaP-AI cells were starved in 1% stripped medium for 24 h. The cells were then treated with Erlotinib (20 lM), Gefitinib (20 lM), Lapatinib (20 lM), CI-1033 (8 lM), LY294002 (20 lM) and Bortezomib (20 lM) for 24 h. Cell culture medium was collected from each sample and subjected to ELISA for sPLA2-IIa. The condition medium samples were diluted 10 times for ELISA. Average of duplicate samples was converted to nanogram per milliliter against standard curve. The data represent one of five repeated experiments.