Serum IL-9 levels depend on allergen exposure: preliminary study

Area of Science:

• Immunology
• Allergy Research

Background:

• Th9 cells are a T cell subset producing interleukin 9 (IL-9).
• Elevated serum IL-9 correlates with allergic rhinitis (AR) symptom severity.
• The relationship between IL-9 and allergen exposure in AR requires investigation.

Purpose of the Study:

• To determine if IL-9 levels are influenced by allergen exposure in AR patients.
• To compare IL-9 levels in symptomatic versus asymptomatic AR patients.

Main Methods:

• Serum IL-9 was measured in 35 symptomatic AR patients with Parietaria allergy during pollen season.
• Serum IL-9 was measured in 38 asymptomatic AR patients with birch allergy outside pollen season.
• Patients were monosensitized to either Parietaria or birch.

Main Results:

• Symptomatic patients exposed to Parietaria allergen exhibited significantly higher serum IL-9 levels compared to asymptomatic patients exposed to birch allergen (p<0.05).
• This suggests a potential link between allergen exposure and elevated IL-9.

Conclusions:

• Serum IL-9 levels in pollen-induced AR may be dependent on allergen exposure.
• Symptomatic patients during pollen season have higher IL-9 than asymptomatic patients outside the season.
• Further research is warranted to confirm these preliminary findings.