Journal
JOURNAL OF NATURAL PRODUCTS
Volume 78, Issue 12, Pages 2924-2931Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jnatprod.5b00574
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Funding
- Research Council of Norway [KOSK-II 197704/V30]
- School of Pharmacy, University of Oslo
- National Institutes of Health GM Grant [PO1GM095467]
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The n-3 polyunsaturated fatty acids act as substrates during the resolution phase of acute inflammation for the biosynthesis of specialized pro-resolving lipid mediators. One premier example is the C22-dihydroxy-polyunsaturated fatty acid protectin D1 (1). The human 15-lipoxygenase type I, via stereoselective processes and with docosahexaenoic acid as the substrate, enables the formation of this specialized pro-resolving lipid mediator. Herein, based on results from LC/MS-MS metabololipidomics, support is presented for the apprehended biosynthesis of 1 in human macrophages occurring via the intermediate 16S,17S-epoxyprotectin (5). Stereochemically pure 5 was obtained using the Katsuki-Sharpless epoxidation protocol, establishing the chirality at the C16 and C17 atoms, one Z-selective reduction, and E- and Z-stereoselective Wittig reactions. In addition, information on the nonenzymatic aqueous hydrolysis products and the half-life of 16S,17S-epoxyprotectin (5) is presented.
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