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Human B-lymphocytes were seeded at 1.5 �� 105 per well in 96-well flat-bottom http://www.selleck.cn/products/Bortezomib.html plates and either treated with immunosuppressants in graded concentrations or remained untreated with solvent controls for 72?h. After incubation, the cells were harvested, washed three times and stained with labelled a-CD80 and a-CD-86 monoclonal antibody (mAb) (BD Biosciences) according to the manufacturer��s protocol. Samples were analysed by flow cytometry, and the geometric mean of CD80 and CD86 on CD19+ cells was determined. The supernatants from proliferation experiments described above were analysed for IgM and IgG concentrations with ELISA quantification sets (Bethyl Laboratories, Inc., Montgomery, AL, USA). Plates were coated with coating antibody for 1?h at RT. After washing, blocking solution was added to the wells and incubated for 30?min at RT. Following a washing step, standard or sample was applied, incubated for 1?h at RT and washed again. Horseradish peroxidase conjugated detection antibody was added to the wells and incubated for 1?h at RT. After washing, 3,3��,5,5��-tetramethylbenzidine substrate solution was applied to the wells and the enzymatic colour reaction was allowed to develop at RT in the dark. The reaction was stopped by adding 0.18?m H2SO4 and measured on a plate reader at 450?nm. Supernatants from sotrastaurin experiments were also analysed for cytokine concentrations. IL-10 levels were measured with the Human IL-10 ELISA Kit II (BD OptEIA?; San Jose, CA, USA) according to the manufacturer��s instructions. Human T-lymphocytes were obtained after PBMC isolation by positive selection of cells expressing CD4 antigen using MACS? http://www.selleckchem.com/products/Everolimus(RAD001).html separation (Miltenyi Biotec, Bergisch Gladbach, Germany). 5 �� 105 human T cells were cultured in complete medium and pre-stimulated for 48?h with 5?��g/ml a-CD28 mAb (BD Biosciences) and 100?U/ml recombinant human IL-2 (ebioscience, Frankfurt, Germany) in 24-well plates that had been coated with a-CD3 mAb (5?��g/ml; BD Biosciences). After harvesting and washing, 5 �� 104 T-lymphocytes were cocultured as previously described [19] with 5 �� 104 autologous human B-lymphocytes for 8d. 2.5?��g/ml ODN 2006 was administered to increase immunoglobulin production and immunosuppressive substances or solvent as control was added to the cultures. Additionally, http://www.selleckchem.com/products/PD-0332991.html human T cells alone and human B cells alone were incubated as controls under the same culture conditions with stimulus and immunosuppressants or solvent controls. The supernatants were examined for IgG and IgM levels as described above. The statistical significance of the results (*P?