scatter using an BD Accuri C6 flow cytometer. A JNK specific inhibitor SP600125 was used as control. Protein lysates were ob tained from cells after treatment with DMSO and ACHP for 48 h. Transient transfection by electroporation 107 Jurkat T cells were transfected by electroporation using Gene Pulser Electroporation System at 290 V and 1500 uF with 20 ug pCMV HA LMP1, 40 ug pCMV HA LMP1, 20 ug pCMV HA LMP1 371 386 or 40 ug pcTa 1. pCMV HA LMP1 is mutated in CTAR1 and the P Q T TRAF binding motif is substituted by al anines, while HA LMP1 371 386 carries a deletion of the carbo y terminal cytoplasmic region in CTAR2 and is incapable of recruiting TRADD and TNIK. Total transfected DNA was adjusted to 100 ug with pcDNA3.

In e periments where NF ��B signaling was blocked, 107 Jurkat cells were transfected with 40 ug of an SV40 promoter driven LMP1 construct, pSV LMP1, and 2 ug or 10 ug of a dominant negative inhibitor of I��B, a plasmid carrying two mutations at critical serine residues S32 and S34 that are usually phosphory lated by IKKB, thereby leading to proteasomal degrad ation of I��B. Total transfected DNA was adjusted to 50 ug with pcDNA3. In transient transfections, the IKK B inhibitor ACHP was added 24 h post transfection for 24 h. Cells were harvested 48 h after transfection to isolate RNA and to perform im munoblots. For invasion assays, Jurkat cells were trans fected with 10 ug pMACS LNGFR, 40 ug pSV LMP1, 20 ug pSiren RetroQ IRES EGFP shNonsense, pSiren RetroQ IRES EGFP shFascin5, or pSiren RetroQ IRES EGFP shFascin4. Total trans fected DNA was adjusted to 100 ug with pcDNA3.

Cross linking of NGF R LMP1 Prior to cross linking of NGF R LMP1, B2264 19 3 cells were cultivated in the absence of CD40L feeder cells for three days. For NGF R cross linking the cells were incu bated in culture medium supplemented with 1 ug ml anti NGF R for Brefeldin_A 30 minutes at 37 C. Cross linking was performed in the presence of 10 ug ml anti fc IgG IgM for the indicated times as de scribed. Magnetic separation To enrich LMP1 e pressing cells, Jurkat cells co transfected with pMACS LNGFR were washed with PBS 48 h post transfection, and stained with anti LNGFR PE conjugated antibodies for 10 min, followed by an incubation with anti PE MicroBeads for 15 min. Labeled cells were separated using MACS LS columns on a MidiMACS Separator.

The per centage of cells stained for LNGFR was determined with the BD Accuri C6 flow cytometer before and after magnetic separation. Invasion assay After magnetic separation LNGFR enriched Jurkat cells were serum starved in cell culture medium containing 1% FCS for 4 h. LCL B cells were cultured in presence of 5 uM ACHP or DMSO for 48h prior to serum starva tion. Invasion assays were performed using CytoSelect 24 Well Cell Invasion Assay according to the manufac turers instructions. Briefly, cells were counted and 2 105 Jurkat cells or 1. 5 105 LCL B cells in 300 ul medium were applied to the upper chamber of a trans well containing polycarbon