Immunoglobulin G-dependent changes in basophil allergen threshold sensitivity during birch pollen immunotherapy

Area of Science:

• Immunology
• Allergy Research
• Cellular Biology

Background:

• Pollen immunotherapy's impact on allergic inflammation effector cells like mast cells and basophils remains unclear.
• Understanding these cellular effects is crucial for optimizing allergy treatments.

Purpose of the Study:

• To investigate the effect of birch pollen immunotherapy on basophil allergen threshold sensitivity.
• To explore the role of basophil sensitivity changes in treatment efficacy.

Main Methods:

• Basophil sensitivity was measured using CD63 flow cytometry in 14 patients with birch pollen rhinitis.
• Analysis included measurements before and during subcutaneous birch immunotherapy.
• IgG inhibition experiments were performed using serum from treated patients.

Main Results:

• A significant decrease in basophil allergen threshold sensitivity was observed after 2, 3, and 5 months of immunotherapy.
• This decrease correlated with improved patient symptoms on a visual analogue scale.
• Immunotherapy-induced serum significantly reduced sensitivity in donor basophils, an effect abolished by IgG depletion.

Conclusions:

• Birch immunotherapy induces IgG antibodies that reduce basophil allergen threshold sensitivity.
• These findings suggest a mechanism by which immunotherapy alleviates allergic responses.
• Further research is needed to confirm the clinical relevance of these basophil sensitivity changes in pollen immunotherapy.