%0 Journal Article %A Oliver J. McElvaney %A David A. Bergin %A Tiziana Adage %A Jason H. Slingsby %A Andreas J. Kungl %A Michael R. Bartley %A Emer P. Reeves %A Noel G. McElvaney %T The chemokine decoy PA401 decreases interleukin-8 and chemotactic activity of cystic fibrosis airway samples %D 2013 %J European Respiratory Journal %P P2108 %V 42 %N Suppl 57 %X Introduction: The chemokine interleukin-8 (IL-8) is a key mediator of inflammation in the cystic fibrosis (CF) lung. Glycosaminoglycans (GAGs) possess the ability to influence the chemokine profile of the CF lung by binding IL-8 and protecting it from proteolytic degradation. In this study, we examined the effects of PA401, a recombinant glycan-binding IL-8 decoy, on IL-8/GAG complexes.Objectives: As PA401 lacks chemotactic activity yet has increased (x40) glycan binding affinity we investigated the anti-inflammatory effect of PA401 on IL-8 levels and activity within CF lung samples in vitro.Methods: Degradation of IL-8 in CF bronchoalveolar lavage fluid (BALF) after treatment with PA401 was analyzed by ELISA. The in vitro chemotactic activity of neutrophils was evaluated by use of a Boyden chamber-based motility assay.Results: Exposure of CF BALF to increasing concentrations of PA401 (50-1000pg/ml) over a time course of 2-12 hours in vitro, significantly reduced the level of detectable IL-8 (p<0.05). Interestingly, PA401 engendered release of IL-8 from GAGs exposing the chemokine susceptible to proteolysis. A 30% decrease in neutrophil chemotactic efficiency towards CF BALF samples incubated with PA401 was also observed (p<0.05).Conclusion: The interaction between chemokines and GAGs plays a role in acute inflammation in the CF lung and offers a potential therapeutic target. The IL-8 decoy PA401 disrupts the interaction between GAGs and IL-8, rendering IL-8 susceptible to proteolytic degradation with subsequent decrease in neutrophil chemotaxis in vitro. Clinical application of an IL-8 decoy may serve to decrease the inflammatory burden in the CF lung in vivo. %U https://erj.ersjournals.com/content/erj/42/Suppl_57/P2108.full.pdf