s in gene e pression that distinguish individual DLBCL. This observation supports recent findings about the role of tonic and or chronic active MAPK signalling in individ ual lymphoma and might therefore constitute a promis ing target for future therapy approaches. Although the discrimination of individual DLBCL by three different gene modules suggest different magnitudes of parallel or equivalent oncogenic activities mediated by Jak STAT, NF ��B, MAPK. Therefore, transformed human germinal centre B cells can be used to test new compounds and their influence on the respective pathways in DLBCLs. A useful tool to test for individual treatment strategies is offered, which is independent from heterogeneous lymphoma associated mutations know from DLBCLs.

Materials and methods Cell culture and stimulation BL2 cells were cultivated as described previously at cell densities between 2 105 and 1 106 cells ml. For stimulation studies, cells were cultured in cell culture medium supplemented with 10 mM HEPES at 1 106 cells ml and incubated with indicated reagents for up to 9 hrs. To crosslink the BCR, BL2 cells were cultured in the presence of 1. 3 ug ml goat IgM F 2 fragments. Recombinant human sCD40L, human BAFF and re combinant human IL21 Drug_discovery were used at a con centration of 200 ng ml, 100 ng ml and 100 ng ml respectively. LPS was added to the cells at a concentration of 1 uM. Cells were harvested using corresponding inhibitors of phosphatases and proteases and RNA was isolated using the RNeasy Plus Mini Kit.

Immunoblot, Calcium Measurement, JNK Immuno comple kinase assays and qRT PCR analysis are sum marized within supplemental Material and Methods. Gene e pression analysis For gene e pression analysis RNA was isolated with RNeasy Plus Mini Kit according to the manu facturers instructions. For real time PCR analysis RNA was reverse transcribed using SuperScript II Reverse Transcriptase and random he amer primers. cDNA samples were further ana lysed by SYBR Green based real time PCR using the 7900HT Fast Real Time PCR System. For whole genome micor arrays RNA was labelled for microarray hybridization using Affymetri GeneChipW IVT Labelling Kit. Fragmentation and hybridization of labelled anti sense RNA on Human Genome U133A 2. 0 plus Arrays was performed according to manufacturers recommendations by the Kompetenzzentrum f��r Fluores zente Bioanalytik.

Rawdata have been uploaded to GEO and can be assessed using GSE42660. Gene e pression values were obtained by first correcting for the back ground and normalizing on probe level using the vari ance stabilization method by Huber and colleagues. The normalized probe intensities were summarized into gene e pression levels by using an additive model fitted by the median polish procedure. If there was more than one probeset per gene, we kept the probeset best responding. This was done by looking at the fold changes between control and stimulation, the probeset with the highest fold change was kept. Additional details f