Airway eosinophilia in chronic bronchitis during exacerbations.

M Saetta, A Di Stefano, P Maestrelli… - American journal of …, 1994 - atsjournals.org
M Saetta, A Di Stefano, P Maestrelli, G Turato, MP Ruggieri, A Roggeri, P Calcagni…
American journal of respiratory and critical care medicine, 1994atsjournals.org
To examine the nature and the degree of airway inflammation in chronic bronchitis during
exacerbations, bronchial biopsies and sputum were obtained in 11 subjects with chronic
bronchitis examined during an exacerbation, and in 12 subjects with chronic bronchitis
examined under baseline conditions. All subjects were nonatopic. Lobar bronchial biopsies
were assessed using histochemical and immunohistochemical techniques, and sputum was
examined for differential cell counts of leukocytes. Subjects with bronchitis during …
To examine the nature and the degree of airway inflammation in chronic bronchitis during exacerbations, bronchial biopsies and sputum were obtained in 11 subjects with chronic bronchitis examined during an exacerbation, and in 12 subjects with chronic bronchitis examined under baseline conditions. All subjects were nonatopic. Lobar bronchial biopsies were assessed using histochemical and immunohistochemical techniques, and sputum was examined for differential cell counts of leukocytes. Subjects with bronchitis during exacerbations had, on average, 30-fold more eosinophils in their bronchial biopsies than did those examined under baseline conditions (p < 0.001). Although to a lesser extent, the numbers of neutrophils (p < 0.01), T-lymphocytes (CD3) (p < 0.05), VLA-1-positive cells (p < 0.01), and TNF-alpha positive cells (p < 0.05) were also increased during exacerbations. By contrast, the T-lymphocyte subpopulations (CD4 and CD8) and the numbers of macrophages, mast cells, IL-2R-positive cells, and IL-1 beta-positive cells were similar in the two groups of subjects, as well as the percentages of ICAM-1- and E-selectin-positive vessels. Eosinophils were also increased in sputum of subjects with exacerbations when compared with those examined under baseline conditions (p < 0.05). In conclusion, exacerbations of chronic bronchitis are associated with a marked airway eosinophilia and with a milder increase in the number of neutrophils, activated T-lymphocytes, and TNF-alpha-positive cells in the bronchial mucosa.
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