Th17-Dependent Nasal Hyperresponsiveness Is Mitigated by Steroid Treatment

Area of Science:

• Immunology
• Allergology
• Pharmacology

Background:

• T helper 17 (Th17) cells are involved in allergic inflammatory diseases like allergic rhinitis (AR).
• The impact of steroid treatments on Th17 cell-driven nasal inflammation remains incompletely understood.

Purpose of the Study:

• To investigate the effectiveness of steroid treatment on Th17 cell-mediated nasal responses in a mouse model of allergic rhinitis.
• To assess the impact of dexamethasone on nasal inflammation and hyperresponsiveness.

Main Methods:

• Th17 cells were differentiated in vitro and transferred into BALB/c mice.
• Mice were challenged intranasally with ovalbumin (OVA) to induce allergic rhinitis.
• Dexamethasone (Dex) was administered subcutaneously prior to OVA challenge.
• Immediate nasal response (INR), nasal hyperresponsiveness (NHR), and inflammatory cell infiltration were evaluated.

Main Results:

• Allergen challenge induced significant nasal inflammatory responses, including neutrophil infiltration, INR, and NHR.
• Dexamethasone treatment significantly suppressed allergen-induced INR and NHR.
• Steroid treatment demonstrated effectiveness in mitigating Th17 cell-driven nasal inflammation.

Conclusions:

• Steroids are effective in suppressing Th17 cell-mediated nasal responses in a mouse model of allergic rhinitis.
• These findings suggest the therapeutic potential of steroids for managing allergic rhinitis driven by Th17 cells.