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J. Exp. Med., Volume 189, Number 12, June 21, 1999 1923-1930

Lipoxin (LX)A4 and Aspirin-triggered 15-epi-LXA4 Inhibit Tumor Necrosis Factor 1alpha -initiated Neutrophil Responses and Trafficking: Regulators of a Cytokine-Chemokine Axis

By Mohamed Hachicha,* Marc Pouliot,* Nicos A. Petasis,Dagger and Charles N. Serhan*

From the * Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115; and the Dagger  Department of Chemistry, University of Southern California, Los Angeles, California 90089

The impact of  lipoxin A4 (LXA4) and aspirin-triggered lipoxins (ATLs) was investigated in tumor necrosis factor (TNF)-alpha -initiated neutrophil (polymorphonuclear leukocyte) responses in vitro and in vivo using metabolically stable LX analogues. At concentrations as low as 1-10 nM, the LXA4 and ATL analogues each inhibited TNF-alpha -stimulated superoxide anion generation and IL-1beta release by human polymorphonuclear leukocytes. These LXA4-ATL actions were time and concentration dependent and proved selective for TNF-alpha , as these responses were not altered with either GM-CSF- or zymosan-stimulated cells. TNF-alpha -induced IL-1beta gene expression was also regulated by both anti-LXA4 receptor antibodies and LXA4-ATL analogues. In murine air pouches, 15R/S-methyl-LXA4 dramatically inhibited TNF-alpha -stimulated leukocyte trafficking, as well as the appearance of both macrophage inflammatory peptide 2 and IL-1beta , while concomitantly stimulating IL-4 in pouch exudates. Together, these results indicate that both LXA4 and ATL regulate TNF-alpha -directed neutrophil actions in vitro and in vivo and stimulate IL-4 in exudates, playing a pivotal role in immune responses.

Key words: eicosanoids;  leukocytes;  lipid mediators;  antiinflammatory receptors;  wound healing


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