title: Medium-chain and long-chain fatty acids have different postabsorptive fates in Atlantic salmon.
abstract: An increasingly larger proportion of the oils used in diets for farmed fish are plant derived and rapeseed oil is most commonly used. Despite high dietary lipid levels and a marked change in lipid composition, the transport and metabolic fate of absorbed fatty acids is not fully understood in teleost fish. The main purpose of this study was to trace the postabsorptive metabolic fate of 2 fatty acids of different chain length: oleic acid [(3)H-18:1(n-9)], constituting 70% of fatty acids in rapeseed oil, and the medium-chain decanoic acid [(14)C-10:0], which does not require carrier molecules for membrane passage. The fatty acids and their metabolites were traced in portal and peripheral blood, liver, heart, skeletal muscle, and visceral adipose tissue at time intervals from 3 to 48 h after feeding. The portal vein was the primary transport route for both 10:0 and 18:1(n-9) from the intestine to the liver the first 6 h after feed intake. From 12 to 48 h, the peripheral route became increasingly more important. The study also indicates a possible direct transport route of fatty acids from the intestine to the surrounding viscera. Our data demonstrate that whereas 18:1(n-9) is primarily deposited as TG in skeletal muscle and visceral adipose tissue, 10:0 is used by the heart and skeletal muscle as a source for rapid energy production.
authors.affiliation: Department of Animal and Aquacultural Sciences, Aquaculture Protein Centre, CoE, Norwegian University of Life Sciences, Ås, Norway.
authors.forename: Vegard
authors.initials: V
authors.lastname: Denstadli
authors.forename: Anne Marie
authors.initials: AM
authors.lastname: Bakke
authors.forename: Gerd Marit
authors.initials: GM
authors.lastname: Berge
authors.forename: Ashild
authors.initials: A
authors.lastname: Krogdahl
authors.forename: Marie
authors.initials: M
authors.lastname: Hillestad
authors.forename: Halvor
authors.initials: H
authors.lastname: Holm
authors.forename: Bente
authors.initials: B
authors.lastname: Ruyter
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry / Q000378:metabolism; D000821:Animal Feed / Q000032:analysis*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002247:Carbon Isotopes / Q000378:metabolism; D003652:Decanoic Acids / Q000737:chemistry / Q000378:metabolism*; D004032:Diet / Q000662:veterinary*; D004041:Dietary Fats / Q000097:blood / Q000378:metabolism*; D005229:Fatty Acids, Monounsaturated; D050356:Lipid Metabolism; D008099:Liver / Q000378:metabolism; D009206:Myocardium / Q000378:metabolism; D019301:Oleic Acid / Q000737:chemistry / Q000378:metabolism*; D010938:Plant Oils / Q000737:chemistry; D000074262:Rapeseed Oil; D020317:Salmo salar / Q000378:metabolism*
chemical_list: D002247:Carbon Isotopes; D003652:Decanoic Acids; D004041:Dietary Fats; D005229:Fatty Acids, Monounsaturated; D010938:Plant Oils; D000074262:Rapeseed Oil; D019301:Oleic Acid; C031071:decanoic acid