Ouse antihuman actin monoclonal antibody (mAB) and clone C4 was purchased from Millipore (Beijing, China).

Ouse antihuman actin monoclonal antibody (mAB) and clone C4 was purchased from Millipore (Beijing, China). Ultra Red Odyssey-labeled rabbit anti-mouse and rat anti-rabbit immunoglobulins were purchased from Invitrogen (Guangzhou, China). Transfection reagent FuGene HD was purchased from Roche (Shanghai, China). SCH 530348 site Luciferin substrate and stop reagent were purchased from Promega (China).Production of Ad-BLU-enhanced green fluorescence protein (EGFP) virions and infection of NPC-derived cellsAd-BLU-EGFP virions were prepared by transfection of pCD316-BLU to packaging 293 cells. CNE2 cells were incubated with different doses of the viral stock, and grown for 48 h on sterile cover slips placed on the bottom of six-well culture plates.Confocal microscopyMethodsCells and plasmidsCNE-1 and CNE-2 lines derived from well differentiated and undifferentiated NPCs from Chinese patients, respectively, were either obtained from the nitrogen stock in our department or purchased from the Cell Bank, Institute of Life Science, Chinese Academy of Science, Shanghai, China. The esophageal cancer line EC109 wasAt the time of harvest, cover slips seeded with transfected cells were washed with phosphate-buffered saline (PBS), fixed with 1:1 acetone-methanol, and stained with propidium iodide (PI; Invitrogen), and then mounted on slides with medium containing an antifade reagent. Images were captured at ?400 magnification using Laser Sharp Software (Macrologic Solutions, Albuquerque, NM).Zhang et al. BMC Cancer 2012, 12:267 http://www.biomedcentral.com/1471-2407/12/Page 3 ofTransfectionCNE-2 cells were seeded in 6- or 12-well culture plates, and incubated at 37 with 5 CO2. Cells were then transfected with 0.5 g (12-well plates) or 1 g (six-well plates) DNA by mixing with FuGene HD, as indicated in the manual provided by the manufacturer. Cells were then incubated for 24 h.Colony formation inhibition assayscontent of the cells was analyzed using Win Cycle32 software (Phoenix Flow Systems Inc., San Diego, CA, USA).Western blottingAssays were conducted as previously described [18]. A total of 1 ?105 CNE2 or EC109 cells were seeded in 12well plates, and were transfected with pcDNA3.1-BLU, pcDNA3.1-TP53, empty vector pcDNA3.1 or were left untransfected. After 48 h, 1 ?104 cells were seeded in triplicate in 6-well culture plates, and cultured with complete medium containing 500 g/ml G418 (Gibco Biotechnology) for 2 weeks. Cells were then fixed with ice-cold acetone-methanol (1:1), stained with gentian violet and washed with sterile PBS. Colonies containing more than 50 cells were counted, and comparisons were made between BLU-, TP53- and mock-transfected and untransfected cells. The experiment was repeated at least three times, and the data were evaluated statistically.Luciferase assaysTransfected cells were pelleted and dissolved in 2?loading buffer (130 mM Tris, pH 6.8, 4 sodium dodecyl sulfate (SDS), 20 glycerol, 10 mercaptoethanol). Total protein was separated by SDS-PAGE and electro-blotted to nitrocellulose membranes, then probed with appropriate primary antibodies diluted in blocking buffer at 1: 500 (Goat anti-human BLU; Abcam) or 1: 1,000[Rabbit anti-c-Jun and PubMed ID:https://www.ncbi.nlm.nih.gov/pubmed/27385778 antiphospho-c-Jun (Ser73) antibodies, and anti-cyclin D1 antibody, CST)] with 5 nonfat milk in PBS overnight at 4 or 1 h at room temperature. After washing with 0.1 Tween-20 in PBS, membranes were incubated with secondary antibodies at 1:10,000 dilution. Blots were developed in an Odyssey Infrared.