Increments of dietary linoleate raise liver arachidonate, but markedly reduce heart n-6 and n-3 fatty acids in the rat.
Four diets containing 20% of energy (en%) as fat and with linoleic acid contents of 1.9, 3.1, 7.7 and 10.1 en%, respectively, were fed to one-month-old male rats for three months. The fatty acid profiles and the levels of the major n-6 and n-3 fatty acids in the lipids of plasma, liver, heart and kidney were measured. We found that with increasing concentrations of 18:2n-6 in the diet, linoleic acid rose in plasma and in all organs, but long-chain n-6 and n-3 fatty acids responded differently. In liver, arachidonic acid increased and n-3 fatty acids were not significantly affected; in heart, both arachidonic and docosahexaenoic acids were progressively reduced; and in kidney, there was no change of n-6 and n-3. The results indicate that incremental changes in dietary linoleate affect the levels of polyunsaturated fatty acids in liver and extrahepatic organs differently.
Marangoni
F
F
Institute of Pharmacological Sciences, University of Milan, Italy.
Mosconi
C
C
Galella
G
G
Galli
C
C
D000818:Animals; D016718:Arachidonic Acid / Q000378:metabolism*; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage / Q000494:pharmacology*; D004281:Docosahexaenoic Acids / Q000378:metabolism; D015118:Eicosapentaenoic Acid / Q000378:metabolism; D005227:Fatty Acids / Q000097:blood / Q000378:metabolism*; D007668:Kidney / Q000378:metabolism; D019787:Linoleic Acid; D008041:Linoleic Acids / Q000008:administration & dosage / Q000494:pharmacology*; D050356:Lipid Metabolism; D008055:Lipids / Q000097:blood; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D009206:Myocardium / Q000378:metabolism*; D009928:Organ Specificity; D051381:Rats
D004042:Dietary Fats, Unsaturated; D005227:Fatty Acids; D008041:Linoleic Acids; D008055:Lipids; D004281:Docosahexaenoic Acids; D016718:Arachidonic Acid; D019787:Linoleic Acid; D015118:Eicosapentaenoic Acid