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Pulmonary and Critical Care Medicine Division, Department of Internal Medicine, Ann Arbor Veterans Affairs Medical Center and University of Michigan Medical Center, Ann Arbor, MI 48109
Leukocytes express both urokinase-type plasminogen activator (uPA) and the urokinase receptor (uPAR, CD87). Evidence in vitro has implicated uPAR as a modulator of ß2 integrin function, particularly CR3 (CD11b/CD18, Mac-1). Pseudomonas aeruginosa infection has been demonstrated to recruit neutrophils to the pulmonary parenchyma by a ß2 integrin-dependent mechanism. We demonstrate that mice deficient in uPAR (uPAR-/-) have profoundly diminished neutrophil recruitment in response to P. aeruginosa pneumonia compared with wild-type (WT) mice. The requirement for uPAR in neutrophil recruitment is independent of the serine protease uPA, as neutrophil recruitment in uPA-/- mice is indistinguishable from recruitment in WT mice. uPAR-/- mice have impaired clearance of P. aeruginosa compared with WT mice, as demonstrated by CFU and comparative histology. WT mice have diminished neutrophil recruitment to the lung when an anti-CD11b mAb is given before inoculation with the pathogen, while recruitment of uPAR-/- neutrophils is unaffected. We conclude that uPAR is required for the recruitment of neutrophils to the lung in response to P. aeruginosa pneumonia and that this requirement is independent of uPA. Further, we show that uPAR and CR3 act by a common mechanism during neutrophil recruitment to the lung in response to P. aeruginosa. This is the first report of a requirement for uPAR during cellular recruitment in vivo against a clinically relevant pathogen.
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