In brief, CALO and INBL cell lines were seeded onto poly-L-lysine-coated microscopy slides and allowed to grow for 72 h. Cells were heated in citrate buffer (0.01 mol/L, pH 6.0) in a microwave oven (85-95°C, 3 times for 5 min each) followed by

blocking the nonspecific binding sites with goat serum. Cells were incubated with the primary mouse monoclonal anti-NKG2D antibody (R&D Systems) overnight in a humidified chamber at 4°C. The samples were then incubated with a polyclonal goat anti-rabbit HRP-conjugated secondary antibody for 30 min at room temperature. learn more Slides were then processed with the universal LSAB-2 single reagents (peroxidase) kit, and the expression of NKG2D was identified by enzyme development with diaminobenzidine. As a final step, the slides were stained with methylene blue counterstaining and dehydrated in graded alcohols. Negative control slides were processed similarly,

except with the primary antibody omitted, and incubated with an irrelevant isotype antibody. Immunohistochemical Ibrutinib price staining was examined using a light microscope (Leica D100) equipped with a digital camera. Expression of surface NKG2D by flow cytometry Cell suspensions (0.4 × 106 cells/ml) in PBS with 5% FBS and 0.01% azide were incubated Idelalisib ic50 with 10 μg/ml of the primary murine monoclonal anti-NKG2D antibody or the respective isotype control for 90 min at 4°C. After washing the cells with PBS, they were incubated in the dark for 30 min with 0.45-μg/ml FITC-labeled goat anti-mouse IgG at 4°C. After washing again, the cells were fixed for 20 min in 1% paraformaldehyde, followed by two more washes. The stained cells were

analyzed in a FACScan cytometer (Becton Dickinson). Isolation of human monocytes Human monocytes were isolated from peripheral blood samples of healthy donors by Ficoll-Paque density gradient centrifugation and plastic adherence purification. Cell viability was greater than 95%, as assessed by trypan blue exclusion, and the purity of monocytes was greater than 93%, as determined by immunofluorescent staining with anti-CD14 monoclonal antibody (Becton Dickinson) and flow cytometric analysis. Statistical analysis All data are expressed as the mean ± SD of three replicates, and all experiments were repeated three times, unless otherwise stated. Statistical analysis was performed by two-way ANOVA for the time course analysis and Student’s t-test for the comparison between groups. Values were considered significantly different if p < 0.05. All reagents were from Sigma Chemical Co., San Louis, MO, USA, unless otherwise specified.