Cytokines in the airway mucosa of subjects with asthma induced by toluene diisocyanate.

Abstract:

:To determine the status of activation of lymphocytes and the role of cytokines on the inflammatory response of the bronchial mucosa in toluene diisocyanate (TDI) asthma, we performed a quantitative analysis of bronchial biopsies obtained from 15 subjects with TDI-induced asthma and seven normal control subjects. Markers of activation of lymphocytes (CD25 and Very Late activation Antigen-1, VLA-1) and expression of Tumor Necrosis Factor-alpha (TNF alpha) and interleukin-1 beta (IL-1 beta) were determined by immunohistology in the submucosa. Moreover, expression of adhesion molecules on endothelium of submucosal vessels was assessed. Asthmatic subjects had increased numbers of cells expressing CD25 and VLA-1 compared with the control group (p < 0.05). TNF alpha and IL-1 beta immunoreactivity was increased in asthmatics compared with control subjects (p < 0.01), whereas the expression of adhesion molecules, ICAM-1 and E-selectin, on vascular endothelium was not significantly different. No significant differences in the morphologic quantifications were observed between the asthmatics who had biopsies taken 2 d after TDI challenge (n = 7) and those with longer interval (21 +/- 8 d) between TDI challenge and biopsy (n = 8), suggesting that the increase in CD25, VLA-1, TNF alpha, and IL-1 beta was not due to an acute effect, but could be considered a part of the chronic inflammatory process of the airways. We conclude that the inflammatory response of the airways in TDI-induced asthma is characterized by persistent activation of lymphocytes and by chronic expression of proinflammatory cytokines.

authors

Maestrelli P,di Stefano A,Occari P,Turato G,Milani G,Pivirotto F,Mapp CE,Fabbri LM,Saetta M

doi

10.1164/ajrccm.151.3.7533600

subject

Has Abstract

pub_date

1995-03-01 00:00:00

pages

607-12

issue

3 Pt 1

eissn

1073-449X

issn

1535-4970

journal_volume

151

pub_type

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