Abstract
The conversion of [ 14C]20:4(n−6) and [ 14C]20:5(n−3) to prostaglandins was measured in homogenates of gills, liver and intestine of the turbot, Scophthalmus maximus (L.). Incorporation of radioactivity into prostaglandins was similar to or greater than into phospholipids, with gills being more active than liver or intestine. When measured at equimolar concentrations, 20:4(n−6) was a better precursor of prostaglandins than 20:5(n−3). Incorporation of 20:4(n−6) into prostaglandins was decreased in the presence of an equimolar concentration of 20:5(n−3), and vice versa. Incorporation of both precursors into prostaglandins was partially inhibited by aspirin and indomethacin. The results are discussed in relation to prostaglandin formation in fish and the abundance of (n−3) polyunsaturated fatty acids in marine lipids generally.
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