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Eosinophil-derived interferon-gamma drives transmembrane protein 119-induced new bone formation in chronic rhinosinusitis with nasal polyps.

BACKGROUND
Chronic rhinosinusitis with nasal polyps (CRSwNP) is a chronic inflammatory sinonasal disease characterized by eosinophilic infiltration and new bone formation (NBF). These changes indicate the severity and prognosis of CRSwNP and may be closely linked to each other.


METHODS
We performed RNA-sequencing to screen specific osteogenic molecules and validated transmembrane protein (TMEM) 119 expression by quantitative PCR and immunohistochemistry (IHC) analyses. TMEM119 knockdown was performed to observe the downregulation of bone mineralization. We validated the bone-forming activity of interferon-gamma (IFNγ) and its signaling pathways in cultured primary sinus bone cells. Cellular sources of IFNγ were identified using immunohistochemistry and immunofluorescence analyses. IL-4-eosinophil-IFNγ axis and the effect of dupilumab were investigated in Eol-1 cells.


RESULTS
We observed elevated IFNγ levels and eosinophils in the nasal fluid and predominantly eosinophil-derived IFNγ in the sinus mucosa of patients with CRSwNP. TMEM119 expression and bone-forming activities were increased in the osteitic and primary sinus bone cells of CRSwNP. IFNγ treatment enhanced bone mineralization and TMEM119 expression via signal transducer and activator of transcription 1 (STAT1) signaling. Moreover, TMEM119 knockdown inhibited sinus bone cell mineralization, and dupilumab attenuated IFNγ secretion by IL4-stimulated Eol-1 cells.


CONCLUSION
Eosinophil-derived IFNγ promotes the bone-forming activities of sinus bone cells via the STAT1-TMEM119 signaling pathway. IL-4-eosinophil-IFNγ axis may be crucial for TMEM119-mediated NBF in CRSwNP. This article is protected by copyright. All rights reserved.