T-cell cytokine profile evaluated at the single cell level in BAL and blood in allergic asthma

American Journal of Respiratory Cell and Molecular Biology
N KrugP H Howarth

Abstract

Atopic asthma is characterized by bronchial mucosal inflammation, involving eosinophils, mast cells, and lymphocytes. It has been suggested that the development and maintenance of this allergic inflammation is due to T-lymphocyte activation with predominant production of the cytokines interleukin 4 (IL-4) and IL-5. To address the ability of peripheral blood and bronchoalveolar lavage T-cells to generate IL-2, IL-4, or interferon gamma (IFN-gamma), we have employed a flow cytometric method which permits analysis of cytokine production at the single cell level within 5 h of obtaining cell samples. When stimulated with PMA and ionomycin, there was a greatly increased percentage of IFN-gamma-producing cells among bronchoalveolar lavage (BAL) T-cells from the subjects with asthma (median 74%), compared with atopic and nonatopic controls (35 and 43%, respectively; P>0.01). The proportion of BAL T-cells producing IL-4 was small (median 1.7%, range 0 to 7.8% in the asthmatic group). In all three groups, the proportion of BAL T-cells producing IL-2 or IFN-gamma was increased compared with T-cells from peripheral blood. There was no significant difference between the three groups in the percentage of BAL T-cells producing IL-2, or in the...Continue Reading

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