For isolation of monocytes, the Monocyte isolation kit II (Miltenyi Biotec) was used according to manufacturer’s instructions. The untouched www.selleckchem.com/products/INCB18424.html monocytes were collected from the flowthrough and washed twice

in RPMI medium containing 2% FCS. Monocytes and DCs were cultured in RPMI1640 supplemented with 10% FCS (BioWhittaker), 2 mM l-glutamine, penicillin, and streptomycin (PAA). In order to differentiate monocytes into immature DCs, 500 IU/mL GM-CSF (ImmunoTools) and 200 IU/mL IL-4 (ImmunoTools) were added to the culture medium. The medium was changed at day 3 and cells were used for viral infection at day 6. HTNV (strain 76–118) was propagated and titrated on Vero E6 cells in a BSL3 laboratory as previously described [44, 45]. Briefly, supernatants from infected Vero E6 cells were collected at day 7–10 p.i., centrifuged at 2000 × g, and stored at −80°C. For virus titration, virus supernatant was serially diluted and incubated on Vero E6 cells for 1 h. Subsequently, cells were overlayed with agarose and incubated for 7–10 days. Agarose was removed, cells were fixed with methanol, and stained for viral N protein as PF-02341066 cell line previously described [44]. Antigen-positive foci were counted for virus titres and expressed as focus-forming units per milliliter. VSV (strain Indiana) was propagated and titrated as previously described [21]. Titres were determined by plaque assay

on Vero E6 cells and expressed as PFU per milliliter. Cell surface staining for antigens was performed as described previously [46]. For

staining of human HLA-I molecules, a mAb (clone W6/32) was used that reacts with a monomorphic epitope of the heavy chain bound to β2m constituting the classical human HLA-I molecules (HLA-A, -B, -C). TAP1-specific mAb (clone TAP1.28) and ICAM-1-specific (clone HA58) mAb were supplied by BD Biosciences. The β2m-specific mAb (clone L368) was kindly provided by Ulrich Schaible (Borstel). The mouse IgG1 mAb (clone B5D9) for staining of intracellular HTNV N protein was oxyclozanide purchased from Progen. Secondary antibodies were PE or FITC-conjugated goat anti-mouse antibodies (Dianova). For intracellular FACS staining, A549 cells were trypsinized and resuspended in DMEM containing 2% FCS. Cells were washed once with PBS. A549 cells were resuspended slowly in ice-cold ethanol and incubated at 4°C for 5–10 min. Subsequently, cells were centrifuged at 600g for 5 min at 4°C and resuspended in FACS wash buffer (PBS pH 7.4, 0.1% FCS) to rehydrate for 15–30 min. Cells were then stained with standard FACS staining procedure as described previously [46]. A549 cells treated with 2000–5000 IU/mL IFN-α (ImmunoTools) for 24 h served as a positive control for staining of human HLA-I molecules in all assays unless otherwise specified. For intracellular detection of HTNV N protein in HTNV-infected A549 cells, the Fix & Perm Kit from Caltag was used according to manufacturer’s instructions. Immunofluorescence analysis was performed as described previously [46].