Related Experiment Videos
Environmental priming influences allergen-specific nasal reactivity
J Toth1, C Schultze-Werninghaus, B Marks
1Department of Otorhinolaryngology, University of Vienna Medical School, Austria.
Allergy
|February 4, 1999
Summary
Environmental allergens like animal dander can prime the nasal allergic response. Exposure to cat or dog dander significantly heightened allergic reactions to grass pollen challenges in sensitized individuals.
Area of Science:
- Allergology
- Immunology
- Environmental Health
Background:
- Prior exposure to one allergen can sensitize the nasal mucosa to others.
- Ubiquitous environmental allergens, such as animal dander, are suspected inducers of this nasal priming effect.
Purpose of the Study:
- To investigate if environmental allergens, particularly animal dander, can induce nasal priming in allergic individuals.
- To assess the impact of sensitization to other aeroallergens on the nasal response to a primary allergen.
Main Methods:
- 26 grass-pollen-allergic subjects with co-sensitization were challenged with Dactylis glomerata pollen in a controlled chamber.
- Nasal airflow and subjective symptom scores were monitored continuously over 2 hours.
- Statistical analysis involved Student's t-test and Mann-Whitney U-test on the area under the curve of nasal flow reduction.
Main Results:
- Subjects with high cat dander sensitization (RAST class ≥3) showed a significantly enhanced and earlier nasal allergic reaction to Dactylis pollen challenge (P < 0.01).
- Similar significant exacerbations were observed in subjects sensitized to dog dander (P < 0.05) and mugwort (P < 0.05).
Conclusions:
- Environmental priming, especially from animal dander, significantly augments specific nasal allergic reactions.
- The findings suggest that exposure to common environmental allergens can influence the severity and onset of allergic rhinitis symptoms.