Inflammation and remodelling patterns in early stage chronic rhinosinusitis

Area of Science:

• Otorhinolaryngology
• Immunology
• Pathology

Background:

• Chronic rhinosinusitis (CRS) is associated with elevated inflammatory and remodeling factors.
• Investigating these factors in early disease stages can elucidate initial pathological events.

Purpose of the Study:

• To examine the expression of key inflammatory and remodeling factors in early-stage CRS without nasal polyps (CRSsNP).
• To identify early molecular events contributing to the pathogenesis of CRSsNP.

Main Methods:

• Sinonasal mucosal samples were collected from nine CRSsNP patients and controls.
• Levels of TGF-beta 1, its receptors, MPO protein, pro-inflammatory cytokines (TNF-alpha, IL-1beta), and Th1 markers (IFN-gamma, T-bet) were measured.
• Collagen deposition was analyzed as an indicator of TGF-beta signaling.

Main Results:

• TGF-beta 1 protein was significantly increased in maxillary sinuses, uncinate process, and anterior/posterior ethmoid compared to turbinates.
• Collagen deposition was higher in the maxillary sinus versus inferior turbinates.
• mRNA for TGF-beta receptors, Th1 markers, pro-inflammatory cytokines, and MPO showed no significant location-based differences.
• TGF-beta 1 mRNA was higher in CRSsNP inferior turbinates versus controls, but other markers did not differ.

Conclusions:

• Early-stage CRSsNP shows elevated TGF-beta 1 protein in paranasal sinuses, but not in turbinates.
• Pro-inflammatory, neutrophilic, and Th1 markers did not differ significantly across locations or between patients and controls.
• These findings implicate TGF-beta 1 in the initiation of CRSsNP and suggest it as a potential therapeutic target.