[Hyposensitization with cross-reacting pollen allergens].

Area of Science:

• Allergy and Immunology
• Immunotherapy
• Respiratory Medicine

Context:

• Grass pollen allergy (pollinosis) is widespread, with rye pollen being a significant allergen in Germany.
• Cross-sensitivity between different pollen types, particularly grass and rye, is a known phenomenon.
• Standard diagnostic methods like RAST (Radioallergosorbent Test) and RAST inhibition confirm cross-reactivity between grass and rye pollen allergens.

Purpose:

• To investigate the therapeutic efficacy of immunotherapy using only grass pollen versus a combination of grass and rye pollen in patients with Poaceae pollen allergy.
• To compare the immunological responses (specific IgE and IgG levels) and clinical outcomes (nasal challenge tests, subjective symptoms) between the two immunotherapy approaches.

Summary:

• Thirty-five patients with Poaceae pollen allergy received either grass pollen-only or grass-and-rye pollen immunotherapy for three years.
• Both treatment groups showed a decrease in specific IgE and an increase in specific IgG for Phleum pratense and rye pollen.
• While immunological markers did not differ between groups, clinical assessments suggested a potentially superior therapeutic effect in the group receiving combined grass and rye pollen immunotherapy.

Impact:

• Findings suggest that combining rye pollen with grass pollen in immunotherapy may offer enhanced clinical benefits for patients with grass pollen allergy, despite similar immunological changes.
• This research could inform optimized immunotherapy strategies for managing allergic rhinitis caused by Poaceae pollens.
• Further investigation is warranted to elucidate the mechanisms behind the observed clinical differences and confirm the superior efficacy of combination therapy.