Abstract
Mucus secretion and its composition are vital in the maintenance of airway health, among which hypoxia-inducible factors (HIFs) are thought to be involved in the regulation of mucin synthesis and regulation. Nasal mucus composition difference between healthy individuals and chronic rhinosinusitis (CRS) patients may contribute to the pathology of chronic nasal diseases, but so far, their role has yet to be completely understood. Nasal biopsy specimens were obtained from 24 healthy subjects and 99 patients with CRS without (CRSsNP, n=36) or with (CRSwNP, n=63) nasal polyps. Immunohistochemical (IHC) and immunofluorescent (IF) staining, quantitative real-time PCR, and western blot were performed to compare the nasal mucus composition between the subjects. Areas of the serous gland and mucous gland were both significantly increased in CRSsNP patients. In CRSwNP patients, a decrease in submucosal gland density and a marked increase in goblet cells were observed. The major gel-forming mucins in the sinonasal mucosa of CRSsNP and CRSwNP are MUC5B and MUC5AC respectively. Mucous cells are found in a higher proportion in both CRSsNP and CRSwNP. The proportion of MUC5AC-positive goblet cells was increased in CRSwNP. The mRNA level of HIF-2α was significantly increased in CRS, and both HIF-1α and HIF-2α were expressed in serous cell but not mucous cell. Over secretion and altered composition of mucus are observed in sinonasal mucosa of CRS, which was mainly associated with glandular hyperplasia in CRSsNP and goblet cell hyperplasia in CRSwNP. Mucus abnormality compromised both non-specific and specific antimicrobial capabilities in the sinonasal mucosa. HIF expression may contribute to differences in mucin synthesis and serous gland regulation, which needs further investigation to understand the pathology of CRS.
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Funding
This study was supported by grants from the National Medical Research Council (NMRC/CIRG/1458/2016), Singapore (to D-YW); The Major Research Development Program of Shandong Province No.2016GSF201084 (to LS), National Nature Science Foundation of China No.81873692 (to LS); Dr Tan Kai Sen is a recipient of fellowship support from European Allergy and Clinical Immunology (EAACI) Research Fellowship 2019.
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Experiments design: D-y W, LS, JL, and Y-y T. Sample collection: K-y S, YO, XL, Y-k O, and MT. Conducting experiments: Y-y T, TL, and X-m Z. Data analysis: Y-y T, KS T, and H-h O. Drafting and revising the manuscript: All authors have read and agreed to the final version of the manuscript.
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The Institutional Review Boards of the Second Hospital of Shandong University in China (KYLL-2018(KJ) P-0025), and the National Healthcare Group Domain-Specific Board of Singapore (DSRB Ref: D/11/228) both approved this study.
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Tu, Y., Liu, J., Li, T. et al. Mucus composition abnormalities in sinonasal mucosa of chronic rhinosinusitis with and without nasal polyps. Inflammation 44, 1937–1948 (2021). https://doi.org/10.1007/s10753-021-01471-6
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DOI: https://doi.org/10.1007/s10753-021-01471-6