Increased CD69 expression on peripheral blood eosinophils after specific inhalation challenge.

Abstract:

BACKGROUND:CD69 is a molecule expressed on human eosinophils after cytokine-activation. Different studies have described the eosinophil activation, evaluated by CD69 expression, at the site of an allergic inflammation. In this study we evaluated the expression of CD69 on peripheral blood eosinophils after a specific inhalation challenge (SIC), in order to better define the state of activation of peripheral blood eosinophils after exposure to sensitizers. METHODS:CD69 expression was evaluated by flow cytometry in nine asthmatic patients before and after a positive SIC with high or low molecular weight agents (pollens, house dust mites, Penicillia, isocyanates) and in 11 asthmatic patients who underwent an inhalation challenge with placebo. CD69 expression was evaluated at baseline, 120 min, and 240 min after the SIC or the placebo. RESULTS:Baseline (before challenge) CD69 expression was comparable between the group of SIC positive patients and the placebo group. CD69 expression on peripheral eosinophils significantly increased 240 min after the challenge in positive SIC patients compared to placebo. In patients with a positive SIC the percentage of peripheral blood eosinophils significantly decreased at 120 and 240 min after the inhalation challenge with respect to the baseline. CONCLUSION:CD69 expression on peripheral blood eosinophils is significantly increased in asthmatic patients after exposure to the sensitizing agent. These data show that the effects of a bronchial stimulation are also detectable on peripheral blood eosinophils.

journal_name

Allergy

journal_title

Allergy

authors

Pignatti P,Perfetti L,Galdi E,Pozzi V,Bossi A,Biale C,Moscato G

doi

10.1034/j.1398-9995.2002.23454.x

keywords:

subject

Has Abstract

pub_date

2002-05-01 00:00:00

pages

411-6

issue

5

eissn

0105-4538

issn

1398-9995

pii

all2o3454

journal_volume

57

pub_type

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