Biosynthesis of oxylipins is initiated by dioxygenases or monooxygenases; however also non-enzymatic autoxidative processes contribute to oxylipin formation. Dioxygenases include lipoxygenases, heme-dependent fatty acid oxygenases, and cyclooxygenases. Fatty acid hydroperoxides or endoperoxides are formed by action of these enzymes. Monooxygenases involved in oxylipin biosynthesis are members of the cytochrome P450 superfamily and can oxidize double bonds with epoxide formation or saturated carbons forming alcohols. Nature has evolved numerous enzymes which metabolize oxylipins into secondary products, many of which possess strong biological activity. Of special importance are the cytochrome P450 enzymes in animals, including CYP5A1, CYP8A1, and the CYP74 family of hydroperoxide-metabolizing enzymes in plants, lower animals and bacteria. In the plant and animal kingdoms the C18 and C20 polyenoic fatty acids, respectively, are the major precursors of oxylipins.
Structure and function
Oxylipins in animals, referred to as eicosanoids because of their formation from twenty-carbon essential fatty acids, have potent and often opposing effects on e.g. smooth muscle and blood platelets. Certain eicosanoids are proinflammatory whereas others are antiinflammatory and are involved in the resolution process which follows tissue injury. Plant oxylipins are mainly involved in control of ontogenesis, reproductive processes and in the resistance to various microbial pathogens and other pests. Oxylipins most often act in an autocrine or paracrine manner, notably in targeting peroxisome proliferator-activated receptors to modify adipocyte formation and function. Most oxylipins in the body are derived from linoleic acid or alpha-linolenic acid. Linoleic acid oxylipins are usually present in blood and tissue in higher concentrations than any other PUFA oxylipin, despite the fact that alpha-linolenic acid is more readily metabolized to oxylipin. Linoleic acid oxylipins can be anti-inflammatory, but are more often pro-inflammatory, associated with atherosclerosis, non-alcoholic fatty liver disease, and Alzheimer's disease. Centenarians have shown reduced levels of linoleic acid oxylipins in their blood circulation. Lowering dietary linoleic acid results in fewer linoleic acid oxylipins in humans. From 1955 to 2005 the linoleic acid content of human adipose tissue has risen an estimated 136% in the United States. In general, oxylipins derived from omega-6 fatty acids are more pro-inflammatory, vasconstrictive, and proliferative than those derived from omega-3 fatty acids. The omega-3 eicosapentaenoic acid -derived and docosahexaenoic acid -derived oxylipins are anti-inflammatory and vasodilatory. In a clinical trial of men with high triglycerides, 3 grams daily of DHA compared with placebo given for 91 days nearly tripled the DHA in red blood cells while reducing oxylipins in those cells. Both groups were given Vitamin C and Vitamin E supplements.
