Journal
AMERICAN JOURNAL OF RHINOLOGY & ALLERGY
Volume 24, Issue 1, Pages 17-20Publisher
OCEAN SIDE PUBLICATIONS INC
DOI: 10.2500/ajra.2010.24.3381
Keywords
Air-liquid interface culture; cell culture; chronic; epithelial; IL-13; innate; innate immunity; nasal polyps; rhinosinusitis; SPLUNC1
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Background: Short palate, lung, and nasal epithelium clone 1 (SPLUNC1) protein is an airway epithelial cell-derived molecule exerting host defense against pathogen. However, the function and regulation of SPLUNC1 in nasal epithelial cells are still unclear. Chronic rhinosinusitis with nasal polyps (CRSwNPs) is a disorder characterized by eosinophilic Th2 inflammation and frequent microbial colonization. The pathogenesis has been postulated as a disturbed mucosal immune response. This study investigates the SPLUNC1 expression of nasal polyp epithelial cells in air-liquid interface (ALI) culture and after treating with Th2 inflammatory cytokines IL-13. Methods: Human nasal polyp epithelial cells isolated from patients with CRSwNPs were put in different cell culture models at days 0 and 21 and were assessed for expression of SPLUNC1 by microarray. Cultured cells in ALI plus retinoic acid (ALI + RA) model were then incubated with 0, 1, 10, and 100 ng/mL human recombinant IL-13 for tip to 5 days. The expression of SPLUNC1 was assessed by real-time quantitative polymerase chain reaction (RT-Q-PCR), reverse-transcriptase PCR (RT-PCR) and Western blot analysis. Results: ALI + RA culture model harvesting ciliary differentiated nasal epithelial cells constitutively expressed high levels of SPLUNC1. In contrast, SPLUNC1 is reduced under classic submerged single layer culture. SPLUNC1 is also dose-responsively down-regulated after incubation with IL-13. Conclusion: A microenvironmental milieu containing IL-13 may be detrimental to the host innate immunity response, at least in part, through the inhibition of SPLUNC1 production. (Am J Rhinol Allergy 24, 17-20, 2010; doi: 10.2500/ajra.2010.24.3381)
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