Upon TLR stimulation, NF-κB and activator protein-1 are activated and subsequently the secretion of SEAP is promoted. THP-1 XBlue cells were stimulated with LPS 100 ng/ml or h-S100A9 20 μg/ml for 4 hr or 48 hr at 37°. Levels of SEAP were detected spectrophotometrically (optical density at 650 nm; SpectraMax340pc; Molecular Devices, Sunnyvale, CA) after 4 hr incubation of supernatants with Quanti-Blue medium (InvivoGen, Vienna, Austria).

In some experiments, THP-1 XBlue cells were treated with 50 μg/ml polymyxin B together with S100A9 Selleckchem AZD6738 or LPS at the concentration stated above. Cytokine concentration in culture supernatants was determined using a Human and Mouse inflammatory cytokine CBA kit (BD Bioscience, San Jose, CA) for simultaneous detection of six cytokines in human THP-1 cells [interleukin-1β (IL-1β), IL-6, IL-8, IL-10, IL-12p70, tumour necrosis factor-α (TNF-α)] and three cytokines in mouse BM-DC (IL-6, IL-1β, TNF-α) according to the manufacturer’s instructions. Data were acquired with a BD FACS LSRII flow cytometer (BD Bioscience). In some

experiments THP-1 cells were pre-incubated with proper inhibitors for 30 min at 37° and thereafter stimulated as indicated. Measurements of TNF-α secretion were performed as described above. The following inhibitors were Tanespimycin datasheet purchased from Merck (Darmstadt, Germany) and used at the indicated concentrations: 10 μm BAY11-7082, 1 μm SB203580, 5 μm MG132, 5 μm PD98059, 10 μm chloroquine. The final concentration of DMSO present in the cultures was < 0·05% of the total culture volume for each inhibitor. Supernatants were

collected, and nitrite content was determined as follows: cell culture supernatants or sodium nitrite standards (0–100 nm) were mixed with an equal volume of freshly prepared Griess reagent (a mixture of 0·1% (weight/volume) N-(1-naphthyl)-ethylenediamine dihydrochloride and 1% (weight/volume) sulphanilamide in 5% (volume/volume) phosphoric acid). After 30 min incubation at room temperature, the absorbance at 550 nm was measured using a plate reader (Spectramax340pc; Molecular Devices). Cells were collected and cytoplasmic/nuclear extracts were isolated as follow: cells were washed twice in TBS (50 mm Tris–HCl pH 7·4, 150 mm NaCl) and incubated for 15 min on ice Rucaparib with buffer A (10 mm HEPES pH 7·9, 10 mm KCl, 0·1 mm EDTA, 0·1 mm EGTA, 1 mm DTT, protease inhibitor cocktail Complete; Roche). Then, 1% NP-40 was added to each sample and the samples were centrifuged briefly. Supernatants were collected (cytoplasmic extract), the pellet was incubated in buffer C (20 mm HEPES pH 7·9, 400 mm NaCl, 1 mm EGTA, 1 mm EDTA, 1 mm DTT, protease inhibitor cocktail Complete), shaken vigorously for 15 min at 4° and thereafter briefly centrifuged. Supernatants were collected, divided into aliquots and stored at −80° (nuclear extract).