Kl. Woolley et al., INTERLEUKIN-3 IN BRONCHIAL BIOPSIES FROM NONASTHMATICS AND PATIENTS WITH MILD AND ALLERGEN-INDUCED ASTHMA, American journal of respiratory and critical care medicine, 153(1), 1996, pp. 350-355
Citations number
35
Categorie Soggetti
Emergency Medicine & Critical Care","Respiratory System
Cytokines, such as interleukin-3 (IL-3), have been suggested to play a
n important role in mediating the increased number of airway eosinophi
ls and metachromatic cells in patients with even mild asthma. We used
immunohistochemistry to determine the presence of IL-3 protein in bron
chial biopsies from nonasthmatics (n = 10) and subjects with mild (n =
8) and allergen-induced (n = 7) asthma. We also examined whether IL-3
was related to airway eosinophil number and activation, the number of
airway metachromatic cells, or airway function. We found that the num
ber and activation of eosinophils and the number of metachromatic cell
s were increased in the airways of asthmatics, compared with nonasthma
tics, with further increases evident after allergen challenge. IL-3 pr
otein was localized primarily to the epithelium in nonasthmatic and as
thmatic subjects, with no difference apparent between groups or after
allergen inhalation challenge. The extent of staining for IL-3 in the
tissue was not correlated with eosinophil number or activity, metachro
matic cell number, airway responsiveness, or the severity of the late
asthmatic response. This study provides the first demonstration of IL-
3 protein localization in bronchial tissue from human airways. The res
ults suggest that the increases in eosinophils and metachromatic cells
associated with mild and allergen-induced asthma occur independent of
IL-3.