Am. J. Respir. Crit. Care Med., Vol 150, No. 4, Oct 1994, 1086-1093.
Accumulation of basophils and their chemotactic activity in the airways during natural airway narrowing in asthmatic individuals
N Maruyama, G Tamura, T Aizawa, T Ohrui, S Shimura, K Shirato and T Takishima
First Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan.
To investigate cellular differentials in natural airway narrowing of
steroid-dependent asthmatic individuals, we performed bronchoalveolar
lavage (BAL) on 10 inpatients with asthma treated only with bronchodilators
during episodes of natural airway narrowing evaluated by serial monitoring
of peak expiratory flow (PEF), and on nine normal volunteers. We confirmed
that the airway narrowing was not completely reversed by salbutamol aerosol
just before the BAL study, but was completely reversed by administration of
systemic steroid after the BAL study. Thus, the natural airway narrowing
investigated in this study consisted not only of the constriction of airway
smooth muscle, but also of edema of the airway mucosa and/or secretion in
airways. Both the numbers and percentages of eosinophils and alcian
blue-positive cells in BAL fluids from the asthmatic subjects were
significantly higher than those of normals, but the numbers and percentages
of neutrophils, lymphocytes, and macrophages were not. Thus, eosinophils
and alcian blue-positive cells selectively increased in the airways during
the natural airway narrowing. Because we found that the metachromatic cells
consisted of two types, with a single nucleus and with segmented nuclei, we
further examined basophil chemotactic activity (BCA) in BAL fluids. We
showed that BCA was significantly higher in the asthmatic (79.3 +/- 17.2
cells/5 hpf) than in the normal subjects (6.2 +/- 1.6 cells/5 hpf), and
also that the activity was more strongly correlated with the cells having
segmented nuclei (p = 0.95) than with all of the cells (p = 0.73).(ABSTRACT
TRUNCATED AT 250 WORDS)
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Copyright © 1994 American Thoracic Society
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