IL-13 expression at the sites of allergen challenge in patients with asthma

S. K. Huang, H. Q. Xiao, J. Kleine-Tebbe, G. Paciotti, D. G. Marsh, L. M. Lichtenstein, M. C. Liu

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Abstract

Atopic asthma is characterized by inflammatory responses of the airway and is associated with up-regulation of Th2 cytokines, notably IL-4 and IL-5. A recently described human cytokine, IL-13, is a potent in vitro modulator of various cell types, including monocytes, B cells, and endothelial cells. Similar to IL-4, it is also involved in the induction of IgE synthesis. However, the in vivo expression and function of IL-13 and its relation to disease remain to be defined. Using a segmental allergen challenge model, we have examined the in vivo expression of IL-13 in the bronchoalveolar lavage (BAL) cells of atopic patients. We found a significant enhancement of both IL-13 transcripts and secreted proteins in the allergen-challenged BAL compared with the saline-challenged control sites of asthmatic and rhinitic patients. In contrast, the expression of IL-13 transcripts was not detected in the BAL of two normal subjects challenged with the same dose of ragweed allergen. The cellular source of IL-13 mRNA was identified in the mononuclear cell fraction of the allergen-challenged BAL. The allergen-induced quantitative differences in the level of transcripts were confirmed by competitive PCR assays. These results suggest that the significant increase in IL-13 in the allergen-challenged BAL is primarily from the mononuclear cells and is involved in the regulation of allergen-induced late phase inflammatory responses.

Original languageEnglish
Pages (from-to)2688-2694
Number of pages7
JournalJournal of Immunology
Volume155
Issue number5
Publication statusPublished - Jan 1 1995
Externally publishedYes

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ASJC Scopus subject areas

  • Immunology

Cite this

Huang, S. K., Xiao, H. Q., Kleine-Tebbe, J., Paciotti, G., Marsh, D. G., Lichtenstein, L. M., & Liu, M. C. (1995). IL-13 expression at the sites of allergen challenge in patients with asthma. Journal of Immunology, 155(5), 2688-2694.