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*
Committee on Immunology and
Section of Pulmonary and Critical Care, Department of Medicine, and
Ben May Institute for Cancer Research, University of Chicago, Chicago, IL, 60637;
Alexion Pharmaceuticals, New Haven, CT 06511; and
¶ Department of Medicine, University of Iowa, Iowa City, IA 52242
A novel costimulatory molecule expressed on activated T cells, inducible costimulator (ICOS), and its ligand, B7-related protein-1 (B7RP-1), were recently identified. ICOS costimulation leads to the induction of Th2 cytokines without augmentation of IL-2 production, suggesting a role for ICOS in Th2 cell differentiation and expansion. In the present study, a soluble form of murine ICOS, ICOS-Ig, was used to block ICOS/B7RP-1 interactions in a Th2 model of allergic airway disease. In this model, mice are sensitized with inactivated Schistosoma mansoni eggs and are subsequently challenged with soluble S. mansoni egg Ag directly in the airways. Treatment of C57BL/6 mice with ICOS-Ig during sensitization and challenge attenuated airway inflammation, as demonstrated by a decrease in cellular infiltration into the lung tissue and airways, as well as by a decrease in local IL-5 production. These inhibitory effects were not due to a lack of T cell priming nor to a defect in Th2 differentiation. In addition, blockade of ICOS/B7RP-1 interactions during ex vivo restimulation of lung Th2 effector cells prevented cytokine production. Thus, blockade of ICOS signaling can significantly reduce airway inflammation without affecting Th2 differentiation in this model of allergic airway disease.
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