The Journal of Experimental Medicine
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Published online 16 October 2000.
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© The Rockefeller University Press, 0022-1007/2000/10/1197/ $5.00
The Journal of Experimental Medicine, Volume 192, Number 8, October 16, 2000 1197-1204


Brief Definitive Report

Novel Functional Sets of Lipid-Derived Mediators with Antiinflammatory Actions Generated from Omega-3 Fatty Acids via Cyclooxygenase 2–Nonsteroidal Antiinflammatory Drugs and Transcellular Processing

Charles N. Serhana, Clary B. Clisha, Jessica Brannona, Sean P. Colgana, Nan Chianga, and Karsten Gronerta

a Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts 02115
Director, Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital, 75 Francis St., Boston, MA 02115.617-278-6957617-732-8822

Aspirin therapy inhibits prostaglandin biosynthesis without directly acting on lipoxygenases, yet via acetylation of cyclooxygenase 2 (COX-2) it leads to bioactive lipoxins (LXs) epimeric at carbon 15 (15-epi-LX, also termed aspirin-triggered LX [ATL]). Here, we report that inflammatory exudates from mice treated with {omega}-3 polyunsaturated fatty acid and aspirin (ASA) generate a novel array of bioactive lipid signals. Human endothelial cells with upregulated COX-2 treated with ASA converted C20:5 {omega}-3 to 18R-hydroxyeicosapentaenoic acid (HEPE) and 15R-HEPE. Each was used by polymorphonuclear leukocytes to generate separate classes of novel trihydroxy-containing mediators, including 5-series 15R-LX5 and 5,12,18R-triHEPE. These new compounds proved to be potent inhibitors of human polymorphonuclear leukocyte transendothelial migration and infiltration in vivo (ATL analogue > 5,12,18R-triHEPE > 18R-HEPE). Acetaminophen and indomethacin also permitted 18R-HEPE and 15R-HEPE generation with recombinant COX-2 as well as {omega}-5 and {omega}-9 oxygenations of other fatty acids that act on hematologic cells. These findings establish new transcellular routes for producing arrays of bioactive lipid mediators via COX-2–nonsteroidal antiinflammatory drug–dependent oxygenations and cell–cell interactions that impact microinflammation. The generation of these and related compounds provides a novel mechanism(s) for the therapeutic benefits of {omega}-3 dietary supplementation, which may be important in inflammation, neoplasia, and vascular diseases.

Key Words: dietary PUFA • eicosanoids • leukocytes • cardiovascular disease


Presented in part at the 11th International Conference on Advances in Prostaglandin and Leukotriene Research, plenary session June 5, 2000, Florence, Italy.

© 2000 The Rockefeller University Press


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