title: Reduced protein oxidation in Wistar rats supplemented with marine ω3 PUFAs.
abstract: The potential effects of various dietary eicosapentaenoic acid (EPA; 20:5) and docosahexaenoic acid (DHA; 22:6) ratios (1:1, 2:1, and 1:2, respectively) on protein redox states from plasma, kidney, skeletal muscle, and liver were investigated in Wistar rats. Dietary fish oil groups were compared with animals fed soybean and linseed oils, vegetable oils enriched in ω6 linoleic acid (LA; 18:2) and ω3 α-linolenic acid (ALA; 18:3), respectively. Fish oil treatments were effective at reducing the level of total fatty acids in plasma and enriching the plasmatic free fatty acid fraction and erythrocyte membranes in EPA and DHA. A proteomic approach consisting of fluorescein 5-thiosemicarbazide (FTSC) labeling of protein carbonyls, FTSC intensity visualization on 1-DE or 2-DE gels, and protein identification by MS/MS was used for the protein oxidation assessment. Albumin was found to be the most carbonylated protein in plasma for all dietary groups, and its oxidation level was significantly modulated by dietary interventions. Supplementation with an equal EPA:DHA ratio (1:1) showed the lowest oxidation score for plasma albumin, followed in increasing order of carbonylation by 1:2 <2:1 ≈ linseed < soybean. Oxidation patterns of myofibrillar skeletal muscle proteins and cytosolic proteins from kidney and liver also indicated a protective effect on proteins for the fish oil treatments, the 1:1 ratio exhibiting the lowest protein oxidation scores. The effect of fish oil treatments at reducing carbonylation on specific proteins from plasma (albumin), skeletal muscle (actin), and liver (albumin, argininosuccinate synthetase, 3-α-hydroxysteroid dehydrogenase) was remarkable. This investigation highlights the efficiency of dietary fish oil at reducing in vivo oxidative damage of proteins compared to oils enriched in the 18-carbon polyunsaturated fatty acids ω3 ALA and ω6 LA, and such antioxidant activity may differ among different fish oil sources because of variations in EPA/DHA content.
authors.affiliation: Instituto de Investigaciones Marinas, Consejo Superior de Investigaciones Cientificas (IIM-CSIC), E-36208 Vigo, Spain. luciamendez@iim.csic.es
authors.forename: Lucía
authors.initials: L
authors.lastname: Méndez
authors.forename: Manuel
authors.initials: M
authors.lastname: Pazos
authors.forename: José M
authors.initials: JM
authors.lastname: Gallardo
authors.forename: Josep L
authors.initials: JL
authors.lastname: Torres
authors.forename: Jara
authors.initials: J
authors.lastname: Pérez-Jiménez
authors.forename: Rosa
authors.initials: R
authors.lastname: Nogués
authors.forename: Marta
authors.initials: M
authors.lastname: Romeu
authors.forename: Isabel
authors.initials: I
authors.lastname: Medina
mesh_terms: D000818:Animals; D019587:Dietary Supplements; D004281:Docosahexaenoic Acids / Q000494:pharmacology*; D015118:Eicosapentaenoic Acid / Q000494:pharmacology*; D005260:Female; D008043:Linseed Oil / Q000494:pharmacology; D010084:Oxidation-Reduction / Q000187:drug effects; D011506:Proteins / Q000737:chemistry / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D013024:Soybean Oil / Q000494:pharmacology
chemical_list: D011506:Proteins; D004281:Docosahexaenoic Acids; D013024:Soybean Oil; D008043:Linseed Oil; D015118:Eicosapentaenoic Acid