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J. Exp. Med.,
Volume 189, Number 12, June 21, 1999 1923-1930
-initiated Neutrophil Responses
and Trafficking: Regulators of a Cytokine-Chemokine Axis
By

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 The impact of lipoxin A4 (LXA4) and aspirin-triggered lipoxins (ATLs) was investigated in tumor necrosis factor (TNF)-
Department of Chemistry, University of Southern
California, Los Angeles, California 90089
-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-
-stimulated superoxide anion generation and IL-1
release by human polymorphonuclear leukocytes. These LXA4-ATL actions
were time and concentration dependent and proved selective for TNF-
, as these responses
were not altered with either GM-CSF- or zymosan-stimulated cells. TNF-
-induced IL-1
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-
-stimulated
leukocyte trafficking, as well as the appearance of both macrophage inflammatory peptide 2 and
IL-1
, while concomitantly stimulating IL-4 in pouch exudates. Together, these results indicate that both LXA4 and ATL regulate TNF-
-directed neutrophil actions in vitro and in vivo
and stimulate IL-4 in exudates, playing a pivotal role in immune responses.
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