LDH activity was analyzed using the commercially available Cytotoxicity Detection Kit (Roche). For three-dimensional skin models, 1×106 human oral keratinocytes (TR146) were seeded on inert filter substrates (Nunc, polycarbonate filter, 0.4 μm pore size, 0.5 cm2) in antibiotic/antimycotic-free defined keratinocyte growth medium (Lonza) for 9 days. After 5 days inert filter substrates were lifted to the air–liquid interface and basal cells were fed through the filter substratum. Epithelium was treated with IFN-γ (300 U/mL), IL-17, IL-22, TNF-α (50 ng/mL each), IL-22/TNF-α combination or Th22 supernatant directly before infection

with 2×106 Candida yeasts for 12 h. Light microscopical studies Luminespib in vitro were performed as previously described using paraffin-embedded oral epithelium specimens 34, 35. Statistical analysis was done using One-way ANOVA and Bonferroni’s Multiple Comparison Test as post test. Statistically significant differences were defined as *p≤0.05, **p<0.01,

***p<0.001. This work was supported by the German Research Foundation STI571 cost (DFG) EY97/2-1 and SFB Tr22. We thank Kerstin Holtz and Gaby Pleyl-Wisgickl for outstanding technical assistance. Conflict of interest: The authors declare no financial or commercial conflict of interest. “
“Viral double-stranded RNA (dsRNA) mimetics have been explored in cancer immunotherapy to promote antitumoral immune response. Polyinosine–polycytidylic acid (poly I:C) and polyadenylic–polyuridylic acid (poly A:U) are synthetic analogs of viral dsRNA and strong inducers of type I interferon (IFN). We describe here a novel effect of dsRNA analogs on cancer cells: besides their potential to induce cancer cell apoptosis through an IFN-β autocrine

loop, dsRNA-elicited Carbohydrate IFN-β production improves dendritic cell (DC) functionality. Human A549 lung and DU145 prostate carcinoma cells significantly responded to poly I:C stimulation, producing IFN-β at levels that were capable of activating STAT1 and enhancing CXCL10, CD40, and CD86 expression on human monocyte-derived DCs. IFN-β produced by poly I:C-activated human cancer cells increased the capacity of monocyte-derived DCs to stimulate IFN-γ production in an allogeneic stimulatory culture in vitro. When melanoma murine B16 cells were stimulated in vitro with poly A:U and then inoculated into TLR3−/− mice, smaller tumors were elicited. This tumor growth inhibition was abrogated in IFNAR1−/− mice. Thus, dsRNA compounds are effective adjuvants not only because they activate DCs and promote strong adaptive immunity, but also because they can directly act on cancer cells to induce endogenous IFN-β production and contribute to the antitumoral response.