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- W2120308746 abstract "Lipoxins (LX) are bioactive eicosanoids that can be formed during cell to cell interactions in human tissues to self limit key responses in host defense and promote resolution. Aspirin treatment initiates biosynthesis of carbon 15 epimeric LXs, and both series of epimers (LX and aspirin-triggered 15-epi-LX) display counter-regulatory actions with neutrophils. In this study, we report that synthetic lipoxin A(4) (LXA(4)) and 15-epi-LXA(4) (i.e., 15(R)-LXA(4) or aspirin-triggered LXA(4)) are essentially equipotent in inhibiting human polymorphonuclear leukocytes (PMN) in vitro chemotaxis in response to leukotriene B(4), with the maximum inhibition ( approximately 50% reduction) obtained at 1 nM LXA(4). At higher concentrations, 15-epi-LXA(4) proved more potent than LXA(4) as its corresponding carboxyl methyl ester. Also, exposure of PMN to LXA(4) and 15-epi-LXA(4) markedly decreased PMN transmigration across both human microvessel endothelial and epithelial cells, where 15-epi-LXA(4) was more active than LXA(4) at stopping migration across epithelial cells. Differences in potency existed between LXA(4) and 15-epi-LXA(4) as their carboxyl methyl esters appear to arise from cell type-specific conversion of their respective carboxyl methyl esters to their corresponding carboxylates as monitored by liquid chromatography tandem mass spectrometry. Both synthetic LXA(4) and 15-epi-LXA(4) as free acids activate recombinant human LXA(4) receptor (ALXR) to regulate gene expression, whereas the corresponding methyl ester of LXA(4) proved to be a partial ALXR antagonist and did not effectively regulate gene expression. These results demonstrate the potent stereospecific actions shared by LXA(4) and 15-epi-LXA(4) for activating human ALXR-regulated gene expression and their ability to inhibit human PMN migration during PMN vascular as well as mucosal cell to cell interactions." @default.
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- W2120308746 date "2003-03-01" @default.
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- W2120308746 title "Lipoxin A4 and Aspirin-Triggered 15-epi-Lipoxin A4 Inhibit Human Neutrophil Migration: Comparisons Between Synthetic 15 Epimers in Chemotaxis and Transmigration with Microvessel Endothelial Cells and Epithelial Cells" @default.
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- W2120308746 doi "https://doi.org/10.4049/jimmunol.170.5.2688" @default.
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