Gene Expression Analysis by Real-Time PCR in Nasal Brushings of Adult Patients with Allergic Rhinitis, Suspected...

Area of Science:

• Immunology
• Genetics
• Otorhinolaryngology

Background:

• Previous studies evaluated epithelial gene expression in allergic rhinitis using microarrays.
• Gene expression in nonallergic rhinitis and suspected allergic rhinitis (negative atopy test with allergen-related symptoms) remained largely unknown.

Purpose of the Study:

• To compare epithelial gene expression across allergic rhinitis, suspected allergic rhinitis, and nonallergic rhinitis patient groups.
• To identify potential gene expression differences that could aid in rhinitis diagnosis.

Main Methods:

• Nasal brushings were collected from healthy controls and patients with allergic rhinitis, suspected allergic rhinitis, and nonallergic rhinitis.
• Real-time PCR was used to measure the expression of 20 selected genes.
• Gene expression was analyzed for associations with allergen type, disease duration, severity, eosinophilia, and serum total IgE.

Main Results:

• Twelve genes were upregulated in adult allergic rhinitis patients; 10 were also increased in suspected allergic rhinitis and nonallergic rhinitis groups.
• CST1, TFF3, and ITLN1 showed differential expression between allergic rhinitis and nonallergic rhinitis.
• Gene expression patterns varied across seasonal, perennial, and mixed rhinitis subtypes, and associations with disease duration, IgE, or severity differed among groups.

Conclusions:

• Allergic rhinitis, suspected allergic rhinitis, and nonallergic rhinitis share similar epithelial gene expression profiles, largely related to Th2 inflammation.
• CST1, TFF3, and ITLN1 may serve as biomarkers to distinguish allergic rhinitis from nonallergic rhinitis.
• Investigating the molecular mechanisms of different rhinitis types can improve diagnosis and treatment strategies.