Peroxisome Proliferator-Activated Receptor- Ligand, 15-Deoxy-12,14-Prostaglandin J2, Reduces Neutrophil Migration via a Nitric Oxide Pathway

Napimoga, M.H.; Vieira, S.M.; Dal-Secco, D.; Freitas, A.; Souto, F.O.; Mestriner, F.L.; Alves-Filho, J.C.; Grespan, R.; Kawai, T.; Ferreira, S.H.; Cunha, F.Q.

The Journal of Immunology 180(1): 609-617

2008


DOI: 10.4049/jimmunol.180.1.609
Accession: 068490863

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Abstract
Ligands for peroxisome proliferator-activated receptor gamma (PPAR-gamma), such as 15-deoxy-Delta12,14-prostaglandin J2 (15d-PGJ2) have been implicated as a new class of anti-inflammatory compounds with possible clinical applications. Based on this concept, this investigation was designed to determine the effect of 15d-PGJ2-mediated activation of PPAR-gamma ligand on neutrophil migration after an inflammatory stimulus and clarify the underlying molecular mechanisms using a mouse model of peritonitis. Our results demonstrated that 15d-PGJ2 administration decreases leukocyte rolling and adhesion to the inflamed mesenteric tissues by a mechanism dependent on NO. Specifically, pharmacological inhibitors of NO synthase remarkably abrogated the 15d-PGJ2-mediated suppression of neutrophil migration to the inflammatory site. Moreover, inducible NOS-/- mice were not susceptible to 15d-PGJ2-mediated suppression of neutrophil migration to the inflammatory sites when compared with their wild type. In addition, 15d-PGJ2-mediated suppression of neutrophil migration appeared to be independent of the production of cytokines and chemokines, since their production were not significantly affected in the carrageenan-injected peritoneal cavities. Finally, up-regulation of carrageenan-triggered ICAM-1 expression in the mesenteric microcirculation vessels was abrogated by pretreatment of wild-type mice with 15d-PGJ2, whereas 15d-PGJ2 inhibited F-actin rearrangement process in neutrophils. Taken together these findings demonstrated that 15d-PGJ2 suppresses inflammation-initiated neutrophil migration in a mechanism dependent on NO production in mesenteric tissues.