Secondary antibodies conjugated with horseradish pero idase were obtained from GE Healthcare. Pero idase activity was detected by enhanced chemiluminescence using a Kodak Image Station sellckchem 4000MM PRO camera. In some e periments, proteins were blotted on PVDF membranes pre incubated in methanol and goat anti mouse Ale a Fluor 647 labelled secondary antibodies were used. Fluorescence intensity was de tected using Kodak Image Station 4000MM PRO camera. At least three independent e periments were performed and one representative result is shown. Intensities of spe cific bands were quantitated using Advanced Image Data Analyser and the mean of at least three independent e periments is shown. Immunofluorescence and confocal laser scanning microscopy Cells were spotted on 10 ug mL fibronectin coated coverslips, fi ed with 4% para formaldehyde, washed twice with PBS and permeabilized with 0.

2% Triton 100. After four wash steps, unspecific binding was blocked by 5% FCS 1% BSA in PBS. Cells were incubated with anti Fascin mouse monoclonal antibodies for 30 min at 37 C. After washing, cells were incubated with Ale a Fluor 488 conjugated goat anti mouse IgG secondary antibodies for 30 min at 37 C. For double labelling with filamentous actin, cells were co incubated with Te as Red phalloidin. For staining of nuclei, cells were incubated with VECTASHIELD Mounting Medium with DAPI. Images were ac quired using a LAS AF DMI 6000 fluorescence microscope equipped with a 63 1. 4 HC PL APO oil immersion ob jective lens. Alternatively, images were acquired using a Leica TCS SP5 confocal laser scanning microscope equipped with a 63 1.

4 HC PL APO CS oil immersion objective lens. Images were analyzed and signal intensities were quantified using LAS AF software. Quantitative real time RT PCR Total cellular RNA was isolated from cell lines or trans fected cells and reversely transcribed to cDNA using Superscript II and random he amer primers or QuantiTect Reverse Transcription Kit. Quantitative real time RT PCR was performed in an ABI Prism 7500 Sequence Analyzer using 200 ng of cDNA and SensiMi II Probe Kit according to the manufacturers instructions. Primers and FAM TAMRA labeled probes for detection of B actin transcripts and 4 1BB have been described before. For quanti tation of Fascin transcripts, a TaqMan Gene E pression Assay was used.

E pression levels were computed by interpolation from standard curves generated from plasmids carrying the respective target sequences and calculating Drug_discovery the mean of triplicate samples. Each sample was measured in at least three biological replicates. ACTB was used for normalization. Inhibitor treatment of LCL B LMP1 positive, EBV transformed LCL B cells were incu bated with increasing amounts of an inhibitor of I��B kinase B, ACHP 6 hydro yphenyl 4 3 pyridinecarboni trile. Calbiochem Merck, Darmstadt, Germany dissolved in DMSO.