Selective recruitment of eosinophils by substance P after repeated allergen exposure in allergic rhinitis.
Allergy
; 50(12): 970-5, 1995 Dec.
Article
in En
| MEDLINE
| ID: mdl-8834826
ABSTRACT
We have investigated the nasal response to substance P after pollen exposure in seasonal allergic rhinitic patients. Seven patients with strictly seasonal allergic rhinitis were studied during the pollen season, 24 h after nasal challenge with pollen. They received increasing doses of nebulized substance P (0 to 80 nmol) in each nostril. Responses were assessed by measurement of nasal airway resistance by posterior rhinomanometry and quantification of albumin, histamine, and inflammatory cells in the nasal lavage fluid. Nasal airway resistance increased in a dose-dependent manner after substance P challenge. Protein and albumin in nasal lavage fluids increased after administration of substance P from 2.6 +/- 0.3 to 6.8 +/- 1.1 mg for protein (P < 0.01) and from 0.2 +/- 0.1 to 3.1 +/- 0.6 mg for albumin (P < 0.02). Expressed as a percentage of total protein, albumin increased from 10.5 +/- 3.6% to 39.9 +/- 3.5% (P < 0.02), suggesting occurrence of plasma leakage. No histamine release was observed after challenge with substance P. Total cell counts significantly increased from 11.4 +/- 2.4 to 41.8 +/- 17.3 x 10(3) cells/ml after substance P (P < 0.05). Eosinophils were already numerous before substance P challenge (2.1 +/- 0.7 x 10(3) cells/ml), and the number of eosinophils markedly increased in all patients after substance P (for the whole group, 25.8 +/- 13.3 cells/ml, P < 0.05). In contrast, the number of neutrophils only slightly increased in five patients, and changes did not reach significance for the group as a whole. Our results show that substance P induces nasal obstruction and albumin extrusion in allergic rhinitic patients after repeated pollen exposure. These vascular phenomena are associated with recruitment of eosinophils. Since substance P is known to be released after nasal allergen challenge, our data suggest a role for substance P in the chronic eosinophilic inflammation of the nasal mucosa observed in symptomatic allergic rhinitis.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Substance P
/
Rhinitis, Allergic, Seasonal
/
Nasal Lavage Fluid
/
Eosinophils
/
Nasal Cavity
Limits:
Adult
/
Female
/
Humans
/
Male
Country/Region as subject:
Europa
Language:
En
Journal:
Allergy
Year:
1995
Document type:
Article
Affiliation country:
France