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Nasal ECP patterns and specific immunotherapy in mite-allergic rhinitis patients
M Branco Ferreira1, A Spinola Santos, M C Pereira Santos
1Immunoallergology Unit, Hospital de Santa Maria CHIUL, Faculty of Medicine, University of Lisbon, Portugal.
European Annals of Allergy and Clinical Immunology
|May 28, 2005
Summary
Specific immunotherapy (SIT) effectively reduces nasal eosinophil cationic protein (ECP) levels after allergen exposure in allergic rhinitis patients. Higher allergen doses in SIT may lead to more pronounced and earlier significant reductions in ECP.
Area of Science:
- Immunology
- Allergy Research
- Otolaryngology
Background:
- Specific immunotherapy (SIT) is a recognized treatment for allergic rhinitis.
- SIT has demonstrated efficacy in mitigating nasal eosinophil cationic protein (ECP) surges post-allergen challenge.
Purpose of the Study:
- To investigate if SIT alters the kinetics of nasal ECP release following specific nasal challenge.
- To determine if changes in ECP release kinetics correlate with the administered allergen dose during SIT.
Main Methods:
- 75 patients with allergic rhinitis monosensitized to house dust mites were studied.
- Patients were divided into control (n=25) and SIT groups (n=50), with SIT groups receiving high (Group 2) or low (Group 1) allergen doses.
- Nasal challenges and ECP measurements were conducted at baseline (T0), 6 months (T1), and 12 months (T2), alongside subjective symptom reporting.
Main Results:
- SIT significantly improved both subjective (visual analog scale) and objective (nasal reactivity) measures.
- SIT markedly reduced post-provocation nasal ECP levels and the incidence of significant ECP increases in treated patients.
- While higher allergen doses (Group 2) showed a trend towards more pronounced ECP changes, statistical significance was not reached compared to lower doses (Group 1).
Conclusions:
- Specific immunotherapy effectively inhibits post-allergen challenge nasal ECP elevation in allergic rhinitis.
- The inhibitory effect of SIT on nasal ECP is more pronounced and achieves statistical significance earlier with higher allergen doses.