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Fatty acid metabolism in rainbow trout (Oncorhynchus mykiss) tissues: differential incorporation of palmitate and oleate
Webber, J.-M.; Brichon, G.; Zwingelstein, G. (2003). Fatty acid metabolism in rainbow trout (Oncorhynchus mykiss) tissues: differential incorporation of palmitate and oleate. Can. J. Fish. Aquat. Sci. 60(10): 1281-1288
In: Canadian Journal of Fisheries and Aquatic Sciences = Journal canadien des sciences halieutiques et aquatiques. National Research Council Canada: Ottawa. ISSN 0706-652X, more
Peer reviewed article  

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Keywords
    Fatty acids; Marine fish; Metabolism; Marine

Authors  Top 
  • Webber, J.-M.
  • Brichon, G.
  • Zwingelstein, G.

Abstract
    Total fatty acid (FA) fluxes of teleost have been well characterized, but the tissues incorporating FA from the circulation and the metabolic fate of these FA remain unclear. Our goals were to determine (i) the relative roles of different tissues in incorporating FA, (ii) the lipid pools that include FA (phospholipids (PL) or neutral lipids (NL)), and (iii) whether saturated and monounsaturated FA behave differently. Fatty acid incorporation was measured after administration of 1-14C-palmitate and 9,10-3H-oleate in rainbow trout (Oncorhynchus mykiss). Results show that FA incorporation varies tremendously among tissues and that the dominant physiological roles of palmitate and oleate are different. For all tissues, oleate is incorporated more rapidly than palmitate into NL (ratio oleate-palmitate 2.8 ± 0.3), showing that oleate plays a prominent role in energy metabolism. However, the two FA enter tissue PL to the same extent (incorporation ratio 1.0 ± 0.2), suggesting equal contributions to membrane turnover. This study reveals a novel aspect of the dominant role played by monounsaturates in energy metabolism: their preferential incorporation in triacylglycerol reserves.

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