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The effect of dietary linoleic acid on the fatty acid composition of individual phospholipid and lipoxygenase products from gills and leucocytes of Atlantic salmon ( Salmo salar )
Author(s) -
Gordon Bell J.,
Raynard Robert S.,
Sargent John R.
Publication year - 1991
Publication title -
lipids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.601
H-Index - 120
eISSN - 1558-9307
pISSN - 0024-4201
DOI - 10.1007/bf02536071
Subject(s) - salmo , sunflower oil , phosphatidylethanolamine , phospholipid , fish oil , biology , biochemistry , linoleic acid , phosphatidylinositol , food science , eicosapentaenoic acid , polyunsaturated fatty acid , gill , lipoxygenase , chemistry , fatty acid , phosphatidylcholine , fishery , enzyme , fish <actinopterygii> , kinase , membrane
Diets containing either fish oil or sunflower oil, both of which supplied the minimum required level of n−3 fatty acids, were given to Atlantic salmon ( Salmo salar ) postsmolts for a period of 16 weeks. In fish fed sunflower oil, the phospholipids of gills showed increased 18∶2n−6 (2–13‐fold), 20∶2n−6 (4.5–12‐fold) and 20∶−6 (2–8‐fold). In addition, phosphatidylethanolamine had increased 20∶4n−6 (1.5‐fold). Changes of a similar magnitude were observed in the phospholipids of blood leucocytes except that, in addition, 20∶4n−6 was elevated in phosphatidylserine (1.7‐fold) and phosphatidylinositol (1.4‐fold). Both tissues showed a general decrease in phospholipid 20∶5n−3 (up to 3‐fold), which caused an increase in 20∶4n−6/20∶5n−3 ratio (1.3–6‐fold). The elongation and desaturation products of 20∶4n−6, 22∶4n−6 and 22∶5n−6 were not increased as a result of feeding sunflower oil. When isolated gill cells were stimulated with the calcium ionophore A23187, 12‐hydroxy‐8,10,14,17‐eicosapentaenoic acid (12‐HEPE) was the major lipoxygenase product from salmon given fish oil. 12‐HEPE was significantly reduced in salmon given sunflower oil. When stimulated with A23187, the lipoxygenase products derived from whole blood of fish given sunflower oil showed decreased levels of leukotriene B 5 , 12‐HEPE and 12‐hydroxy‐5,8,10,14‐eicosatetraenoic acid.