Evaluation of inducible costimulator/B7-related protein-1 as a therapeutic target in a murine model of allergic airway inflammation

American Journal of Respiratory Cell and Molecular Biology
Ryan E WileyManel Jordana

Abstract

Given its primary role in the execution of T cell, and especially Th2, effector activity, the inducible costimulator (ICOS)/B7-related protein (RP)-1 costimulatory pathway is currently being heralded as a promising therapeutic target for immune-inflammatory disorders such as asthma. This study investigates the merits of ICOS blockade in a murine model of experimental asthma in which mice are sensitized to ovalbumin (OVA) through the respiratory mucosa. Intraperitoneal treatment of mice with anti-ICOS neutralizing antibody during sensitization resulted in a marked reduction in airway eosinophilia and IL-5 in bronchoalveolar lavage, but had no effect on interleukin (IL)-4, IL-13, and eotaxin content in bronchoalveolar lavage or the production of OVA-specific immunoglobulin E in serum. Cultured splenocytes from mice sensitized to OVA in the context of ICOS ablation produced enhanced levels of IL-4 and IL-5 upon stimulation with OVA, and this correlated with elevated inflammation and immunoglobulin E secretion upon long-term in vivo OVA recall; the deleterious effects ICOS blockade, however, were not associated with reduced IL-10 production by splenocytes. Peculiarly, anti-ICOS intervention during OVA rechallenge had no effect on a...Continue Reading

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