Abstract
Interleukin 17C (IL-17C) is a functionally distinct member of the IL-17 family that is selectively induced in epithelia by bacterial challenge and inflammatory stimuli. The goal of this study was to explore the expression of IL-17C in nasal epithelial cells and their role in the pathogenesis of chronic rhinosinusitis with nasal polyposis (CRSwNPs). IL-17C expression was detected using immunohistochemistry (IHC) of the epithelial cell layers and using the western blot assay on whole tissue homogenates from control subjects (n = 10) and CRSwNP patients [10 non-eosinophilic polyps and 10 eosinophilic polyps (EPs)]. Expression of IL-17C and P47-phox were evaluated in the human nasal epithelial cells (RPMI-2650 cells) after treatment with staphylococcal enterotoxin B (SEB) and pretreatment with reactive oxygen species (ROS) scavenger, N-acetyl l-cysteine (NAC). Finally, IL-17C expression was demonstrated in eosinophilic rhinosinusitis murine model using IHC. Epithelial expression of IL-17C was higher in nasal polyps (especially in EPs) compared to control mucosa. SEB increased the expression of IL-17C and P47-phox in RPMI-2650 cells. SEB-induced expressions of both IL-17C and P47-phox were significantly decreased in NAC-pretreated cells. Epithelial expression of IL-17C was significantly higher in experimental mice compared to control mice. SEB-induced IL-17C expression in nasal epithelial cells is mediated by ROS production. This pathway may be associated with the pathogenesis of CRSwNP, especially eosinophilic nasal polyps.
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Acknowledgments
We thank the study participants and all joint research workers. We also thank the patients who provided samples for the study.
This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0009790).
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Jin, J., Rha, KS., Kim, D.W. et al. IL-17C expression in nasal epithelial cells of chronic rhinosinusitis with nasal polyposis. Eur Arch Otorhinolaryngol 271, 1097–1105 (2014). https://doi.org/10.1007/s00405-013-2683-x
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DOI: https://doi.org/10.1007/s00405-013-2683-x