Abstract
In allergic rhinitis, mast cells, activated by cross-linking of allergen to mast cell-bound specific IgE, release both vasoactive mediators related to the early nasal symptoms and chemotactic mediators that attract inflammatory cells, such as eosinophils, related to the late-phase response. We have analyzed, during and out of pollen season, in blood and nasal fluid from patients allergic to grass pollen, histamine and tryptase to monitor the early phase markers and eosinophil and eosinophil cationic protein (ECP) to monitor the late phase. Twenty patients were enrolled in the study. As a control, we studied 10 nonatopic subjects. Mediators and eosinophils were assessed in blood and nasal fluid. Histamine was tested only in nasal fluid. During pollen season, tryptase but not histamine increased in nasal fluids from patients (2.96 vs 0.22 U/ml, p = 0.001) and correlated with symptom scores (r(s) = 0.63, p = 0.003). Tryptase was not detected in serum. Eosinophils increased in nasal cytology (17.0% vs 2.0%, p = 0.001) and in the blood (265 vs 12.7 x 10(6) L, p = 0.001) from patients, but they did not correlate with symptom scores. ECP increased only in the nasal lavage (1633 vs 1.30 ng/ml, p = 0.001) and correlated with symptom sco...Continue Reading
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