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Image Search Results
Journal: The Journal of Biological Chemistry
Article Title: A peptide derived from adaptor protein STAP-2 inhibits tumor progression by downregulating epidermal growth factor receptor signaling
doi: 10.1016/j.jbc.2022.102724
Figure Lengend Snippet: STAP-2–derived 2D5 peptide inhibits cancer cell proliferation. A , HEK293T cells were transfected with expression vectors for the FLAG-STAP-2 PH domain and GST-EGFR cytosol domain, and then lysates were pulled down using glutathione beads at 48 h posttransfection and blotted. B – D , DU145 cells and MCF7 cells were treated with STAP-2–derived peptides at the indicated concentrations for 48 h, and then relative cell viability was measured by Cell Titer glo assay. E , DU145 cells were treated with 50 μM 2D5 peptide for 72 h. Percentage of the cells that were Annexin V and/or PI positive was analyzed by flow cytometry. F , DU145 cells were treated with 0.3 μM FITC-conjugated 2D5 and ΔR8-2D5 peptides for 30 min, and then FITC-positive DU145 cells were analyzed by flow cytometry. G , DU145 cells were treated with truncated 2D5 peptides, and then cell viability was measured as described in ( B ). H , various cell lines were treated with 2D5 peptide, and then cell viability was measured as described in ( B ). T47D cells and MDA-MB-453 cells were treated with 2D5 peptide for 96 h, and then cell viability was measured. I , DU145 cells were treated with 1, 10, 20, 30, 40, and 50 μM 2D5 peptide for 48 h, and then relative cell viability was measured by Cell Titer glo assay. n = 3. Mean values and SDs are shown. EGFR, epidermal growth factor receptor; PH, Pleckstrin homology; PI, propidium iodide.
Article Snippet: The following antibodies were used for immunoblotting: anti-Myc antibody (9E10, Sigma), anti-HA antibody (C29F4, Cell Signaling Technology),
Techniques: Derivative Assay, Transfection, Expressing, Glo Assay, Flow Cytometry
Journal: The Journal of Biological Chemistry
Article Title: A peptide derived from adaptor protein STAP-2 inhibits tumor progression by downregulating epidermal growth factor receptor signaling
doi: 10.1016/j.jbc.2022.102724
Figure Lengend Snippet: 2D5 peptide suppresses EGFR signaling. A , HEK293T cells were transfected with expression vectors for GST-STAP-2 and EGFR-HA, and then lysates were incubated with 1 or 50 μM ΔR8-2D5 peptide for 1 h. GST-STAP-2 was pulled down and blotted. B – D , DU145 cells were serum starved for 1 h and then treated with 10 μM 2D5 peptide for 30 min. The cells were stimulated with 100 ng/ml EGF for 0, 10, and 30 min and then lysates were blotted. E , DU145 cells were treated with 10 μM 2D5 peptide for 0, 30, 60, and 120 min, and then lysates were blotted. F , DU145 cells were treated with 1 or 10 μM 2D5 peptide for 30 min, and then lysates were blotted. G , shCtrl- and shEGFR-expressing DU145 cells were treated with 2D5 peptide same as ( B ) and stimulated with 100 ng/ml EGF for 15 min, then lysates were blotted. H and I , SW620 cells were treated with 2D5 peptide and 100 ng/ml EGF same as ( B ), and then lysates were blotted. J , HEK293T cells were transfected with expression vectors for Myc-STAP-2 and EGFR-HA WT or Y1068F/Y1173F (YY/FF), and then lysates were immunoprecipitated and blotted. K , DU145 cells were treated with 10 μM 2D5 peptide, and then Ccnd1 and Survivin mRNA levels were quantified by qPCR. L , DU145 cells were treated with 25 μM 2D5 peptide and 0.1 or 1 μM gefitinib for 48 h, and then cell viability was measured. M , shCtrl- and shSTAP-2-expressing DU145 cells were treated with 25 μM 2D5 peptide for 48 h, and then cell viability was measured. N , THP-1 cells were treated with 20 ng/ml PMA for 3 days. THP-1–derived macrophages were treated with 10 μM 2D5 peptide for 1 h and then stimulated with 1 μg/ml LPS for the indicated times, and then lysates were blotted. n = 3, Mean values and SDs are shown. ∗ p < 0.05, ∗∗ p < 0.01 (paired Student’s t test). EGFR, epidermal growth factor receptor; PMA, phorbol 12-myristate 13-acetate; qPCR, quantitative PCR.
Article Snippet: The following antibodies were used for immunoblotting: anti-Myc antibody (9E10, Sigma), anti-HA antibody (C29F4, Cell Signaling Technology),
Techniques: Transfection, Expressing, Incubation, Immunoprecipitation, Derivative Assay, Real-time Polymerase Chain Reaction
Journal: The Journal of Biological Chemistry
Article Title: A peptide derived from adaptor protein STAP-2 inhibits tumor progression by downregulating epidermal growth factor receptor signaling
doi: 10.1016/j.jbc.2022.102724
Figure Lengend Snippet: 2D5 peptide decreases EGFR stabilization. A , DU145 cells were treated with 10 μM 2D5 peptide for 1 h under serum starvation and then stimulated with 100 ng/ml EGF for 20 min. The cells were fixed and stained with anti-EGFR ( green ) and anti-LAMP1 ( red ) antibodies. B , localization of EGFR and LAMP-1 was observed by confocal microscopy. We calculated the area of total EGFR and EGFR-LAMP-1 colocalization by an ImageJ software, and the percentage of EGFR-LAMP-1/total EGFR area in each 20 cells were shown. n = 20. C , DU145 cells were treated with 10 μM cycloheximide in serum-free medium for 1 h and then treated with 50 μM 2D5 peptide for 1 h together with 10 μM cycloheximide in serum-free medium. The cells were then stimulated with 100 ng/ml EGF, and lysates were blotted. D , band intensity of EGFR/Actin in ( C ) (n = 3). Mean values and SDs are shown. ∗ p < 0.05, ∗∗ p < 0.01, ∗∗∗ p < 0.001 (paired Student’s t test). EGFR, epidermal growth factor receptor.
Article Snippet: The following antibodies were used for immunoblotting: anti-Myc antibody (9E10, Sigma), anti-HA antibody (C29F4, Cell Signaling Technology),
Techniques: Staining, Confocal Microscopy, Software