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• W2157923883 abstract "Background Plasmacytoid dendritic cells (pDCs) are involved in a variety of immune functions. However, the expression of cytotoxic granule proteins like granzymes and perforin in human pDCs is still poorly understood. Objective The aim of this study was to systematically analyse the expression and regulation of cytotoxic granule proteins in human pDCs. Methods The expression of cytotoxic proteins was analysed by RT-PCR, flow cytometry, and fluorescence microscopy. The functional expression of these proteins was confirmed in a flow-cytometry-based cytotoxicity assay using K562 cells as targets. In order to analyse the regulation of pDC-derived cytotoxic proteins in infectious and allergic diseases, human pDCs were analysed after stimulation with toll-like receptor (TLR)7/9 ligands and in the human asthma model of segmental allergen challenge. Results Granzyme B (GrB), but not the granzymes A, H, K, M or perforin, was specifically expressed by human pDCs and this GrB expression was up-regulated by IL-3 stimulation. In addition, IL-3-stimulated pDCs were found to kill K562 cells in a GrB- and caspase-dependent manner. TLR7/9 ligands significantly suppressed GrB expression in pDCs. In contrast, there was an up-regulation of GrB in endobronchial pDCs 24 h after allergen challenge, and this was accompanied by enhanced GrB concentrations in bronchoalveolar lavage fluid. Conclusion We report the selective expression of GrB in human pDCs and show for the first time pDC-mediated GrB- and caspase-dependent cytotoxicity against target cells. In addition, the regulation of GrB expression was investigated in vitro and in vivo providing an evidence for a specific role of pDC-derived GrB in allergic inflammation. Cite this as: K. Bratke, J. Nielsen, F. Manig, C. Klein, M. Kuepper, S. Geyer, P. Julius, M. Lommatzsch and J. C. Virchow, Clinical & Experimental Allergy, 2010 (40) 1015–1024." @default.
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• W2157923883 date "2010-04-13" @default.
• W2157923883 modified "2023-10-17" @default.
• W2157923883 title "Functional expression of granzyme B in human plasmacytoid dendritic cells: a role in allergic inflammation" @default.
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• W2157923883 doi "https://doi.org/10.1111/j.1365-2222.2010.03499.x" @default.
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