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Novartis Respiratory Research Centre, Horsham, West Sussex RH12 5AB, United Kingdom
Submitted 1 April 2003 ; accepted in final form 29 May 2003
In addition to a direct proinflammatory role, IL-13 has been demonstrated to induce a goblet cell metaplastic phenotype in the airway epithelium in vivo. We have studied the direct effects of IL-13 (and IL-4) on well-differentiated, air-liquid interface cultures of human bronchial epithelial cells (HBEs) and provide a quantitative assessment of the development of a mucus hypersecretory phenotype induced by these cytokines. Using Alcian blue staining of goblet cells and immunohistochemical detection of MUC5AC, we found that IL-13 (and IL-4) induced increases in the goblet cell density (GCD) of the HBE cultures. The effects of these cytokines were critically dependent on concentration: 1 ng/ml routinely induced a 5- to 10-fold increase in GCD that was associated with a hypersecretory ion transport phenotype. Paradoxically, 10 ng/ml of either cytokine induced a profound reduction in GCD. Removal of EGF from the culture media or treatment of the cells with AG-1478 [a potent inhibitor of EGF receptor tyrosine kinase (EGFR-TK)] demonstrated that the EGFR-TK pathway was key to the regulation of the basal GCD but that it was not involved in the IL-13-driven increase. The IL-13-driven increase in GCD was, however, sensitive to inhibition of MEK (PD-98059, U-0126), p38 MAPK (SB-202190), and phosphatidylinositol (PtdIns) 3-kinase (LY-294002). These data support the concept that IL-13 is in part able to induce a mucus hypersecretory phenotype through a direct interaction with the airway epithelium and that MAP kinase and PtdIns 3-kinase signaling pathways are involved.
MUC5AC; inflammation; hypersecretion; cytokine
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