Abstract
Lysozyme, secretory leukocyte proteinase inhibitor (SLPI) and glycoprotein 340 (gp340) are important effectors of the innate immune system in sinonasal mucosa. Bacterial biofilms (BBF) are highly organized bacterial communities resistant to host defense systems. The aim of this study was to investigate the expression of lysozyme, SLPI and gp340 in sinus mucosa from chronic rhinosinusitis (CRS) patients with different BBF status. In this prospective cohort study, 63 CRS patients undergoing endoscopic sinus surgery and 20 controls were enrolled and their mucosal samples from ethmoid sinus were obtained. Biofilms were examined by confocal scanning laser microscopy (CSLM), and the expressions of lysozyme, SLPI and gp340 in mRNA and protein levels were detected using reverse transcription polymerase chain reaction (RT-PCR), immunohistochemistry and Western blot assay, respectively. As a result, 35/63 (55.6 %) of the patients were BBF positive in the CRS group and none in controls. Both mRNA and protein levels of lysozyme, SLPI and gp340 in patients with CRS were significantly higher than those in controls. When sub-classified according to BBF status, the CRS patients with BBF revealed the significantly enhanced mRNA and protein levels of lysozyme, SLPI and gp340. In conclusion, our study demonstrates that lysozyme, SLPI and gp340 are constitutively expressed in sinus mucosa and their up-regulated expressions on both the mRNA and protein levels are associated with BBF in CRS patients. These findings may offer an insight into the interaction between BBF and the innate immune system.
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Dong, D., Yulin, Z., Yan, X. et al. Enhanced expressions of lysozyme, SLPI and glycoprotein 340 in biofilm-associated chronic rhinosinusitis. Eur Arch Otorhinolaryngol 271, 1563–1571 (2014). https://doi.org/10.1007/s00405-013-2758-8
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DOI: https://doi.org/10.1007/s00405-013-2758-8