Interferon- γ Enhances Rhinovirus-Induced RANTES Secretion by Airway Epithelial Cells

Respiratory viruses, including rhinoviruses, infect respiratory epithelium and induce a variety of cytokines and chemokines that can initiate an inflammatory response. Cytokines, such as interferon (IFN)-gamma and tumor necrosis factor (TNF)-alpha, could enhance epithelial cell activation by inducing virus receptors. To test this hypothesis, effects of IFN-gamma or TNF-alpha on expression of intercellular adhesion molecule (ICAM)-1, rhinovirus binding, and virus-induced chemokine secretion on A549 and human bronchial epithelial cells (HBEC) were determined. The results varied with the type of cell. IFN-gamma was a stronger inducer of ICAM-1 and viral binding on HBEC, whereas TNF-alpha had greater effects on A549 cells. In addition, IFN-gamma, but not TNF-alpha, synergistically enhanced regulated on activation, normal T cells expressed and secreted (RANTES) mRNA expression and protein secretion induced by RV16 or RV49. To determine whether IFN-gamma could enhance RANTES secretion independent of effects on ICAM-1 and RV binding, HBEC were transfected with RV16 RNA in the presence or absence of IFN-gamma. RV16 RNA alone stimulated RANTES secretion, and this effect was enhanced by IFN-gamma. These results demonstrate that IFN-gamma can enhance rhinovirus-induced RANTES secretion by increasing viral binding, and through a second receptor-independent pathway. These findings suggest that IFN-gamma, by upregulating RANTES secretion, could be an important regulator of the initial immune response to rhinovirus infections.

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