We have studied the phenotype and activation status of leukocytes in the bronchial mucosa in patients with isocyanate-induced asthma. Fiberoptic bronchial biopsy specimens were obtained from nine subjects with occupational (five toluene- and four methylene diisocyanate-sensitive) asthma, 10 subjects with extrinsic asthma, and 12 nonatopic healthy control subjects. Bronchial biopsy specimens were examined by immunohistology with a panel of monoclonal antibodies and the alkaline phosphatase—antialkaline phosphatase method. There was a significant increase in the number of CD25+ cells (interleukin-2 receptor-bearing cells, presumed “activated” T-lymphocytes; p < 0.01) in isocyanate-induced asthma compared with that of control subjects. There were also significant increases in major basic protein (BMK-13)-positive (p < 0.02) and EG2-positive (p < 0.01) cells that represent total and “activated” eosinophil cationic protein—secreting eosinophils, respectively. In agreement with our previous findings, CD25+ (p < 0.01), BMK-13 (p < 0.03), and EG2+ (p < 0.01) cells were also elevated in extrinsic asthma. No significant differences were observed in the numbers of T-lymphocyte phenotypic markers (CD3, CD4, and CD8) between subjects with asthma (isocyanate-induced and extrinsic) and control subjects. Similarly, no significant differences in immunostaining for neutrophil elastase (neutrophils) or CD68 (macrophages) were observed. The results suggest that isocyanate-induced occupational asthma and atopic (extrinsic) asthma have a similar pattern of inflammatory cell infiltrate. The results support the view that T-lymphocyte activation and eosinophil recruitment may be important in asthma of diverse etiology.
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|Anno di pubblicazione:||1992|
|Titolo:||Activated T-lymphocytes and eosinophils in the bronchial mucosa in isocyanate-induced asthma.|
|Autori:||A. M. Bentley; P. Maestrelli; M. Saetta; L. M. Fabbri; D. S. Robinson; B. L. Bradley; P. K. Jeffery; S. R. Durham; A. B. Kay|
|Appare nelle tipologie:||Articolo su rivista|
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