| First Author | Young RE | Year | 2004 |
| Journal | J Immunol | Volume | 172 |
| Issue | 7 | Pages | 4493-502 |
| PubMed ID | 15034066 | Mgi Jnum | J:88722 |
| Mgi Id | MGI:3036957 | Doi | 10.4049/jimmunol.172.7.4493 |
| Citation | Young RE, et al. (2004) Neutrophil elastase (NE)-deficient mice demonstrate a nonredundant role for NE in neutrophil migration, generation of proinflammatory mediators, and phagocytosis in response to zymosan particles in vivo. J Immunol 172(7):4493-502 |
| abstractText | Neutrophil elastase (NE) remains a controversial player in the process of leukocyte transmigration and much of this controversy stems from conflicting reports on the effects of NE inhibitors. The availability of NE-deficient mice (NE(-/-)) provides a clean and elegant tool for the study of leukocyte migration in vivo. In this study, NE(-/-) mice were used to investigate the role of NE in leukocyte migration through cremasteric venules, as observed by intravital microscopy, induced by locally administered cytokines IL-1beta and TNF-alpha and the particulate stimulus, zymosan. Although no defects in leukocyte responses induced by the cytokines were observed, zymosan-induced leukocyte firm adhesion and transmigration was suppressed in NE(-/-) mice. These responses were also inhibited in wild-type mice when zymosan was coinjected with a specific NE inhibitor. Quantification of inflammatory mediator levels in homogenates of zymosan-stimulated tissues indicated reductions in levels of IL-1beta, KC, and macrophage inflammatory protein-1alpha in NE(-/-) mice. Furthermore, phagocytosis of fluorescent zymosan particles, as observed by intravital microscopy, was diminished in NE-deficient animals. Collectively, the findings of this study indicate a nonredundant role for NE in zymosan-induced leukocyte firm adhesion and transmigration, and that this defect is associated with impaired generation of proinflammatory mediators as well as phagocytosis of zymosan particles in vivo. |
