Effects of Supplementation with Omega-3 Fatty Acids on Oxidative Stress and Inflammation in Patients with Alzheimer's Disease: The OmegAD Study
2014 (English)In: Journal of Alzheimer's Disease, ISSN 1387-2877, Vol. 42, no 3, 823-831 p.Article in journal (Refereed) Published
Background: Oxidative stress and inflammation are two key mechanisms suggested to be involved in the pathogenesis of Alzheimer's disease (AD). Omega-3 fatty acids (omega-3 FAs) found in fish and fish oil have several biological properties that may be beneficial in AD. However, they may also auto-oxidize and induce in vivo lipid peroxidation. Objective: The objective of this study was to evaluate systemic oxidative stress and inflammatory biomarkers following oral supplementation of dietary omega-3 FA. Methods: Forty patients with moderate AD were randomized to receive 1.7 g DHA (22:6) and 0.6 g EPA (20:5) or placebo for 6 months. Urinary samples were collected before and after supplementation. The levels of the major F-2-isoprostane, 8-iso-PGF(2 alpha) a consistent in vivo biomarker of oxidative stress, and 15-keto-dihydro-PGF(2 alpha), a major metabolite of PGF(2 alpha) and biomarker of inflammatory response, were measured. Results: F-2-isoprostane in urine increased in the placebo group after 6 months, but therewas no clear difference in treatment effect between supplemented and non-supplemented patients on the urinary levels of F-2-isoprostanes and 15-keto-dihydro-PGF(2 alpha). At baseline, the levels of 15-keto-dihydro-PGF(2 alpha) showed negative correlative relationships to omega-3 FAs, and a positive correlation to linoleic acid. 8-iso-PGF(2 alpha) correlated negatively to the omega-6 FA arachidonic acid. Conclusion: The findings indicate that supplementation of omega-3 FAs to patients with AD for 6 months does not have a clear effect on free radical-mediated formation of F-2-isoprostane or cyclooxygenase-mediated formation of prostaglandin F-2 alpha. The correlative relationships to FAs indicate a potential role of FAs in immunoregulation.
Place, publisher, year, edition, pages
2014. Vol. 42, no 3, 823-831 p.
Alzheimer's disease, eicosanoids, F-2-isoprostane, inflammation, lipids, omega-3 fatty acids, oxidative stress, prostaglandin F-2 alpha
IdentifiersURN: urn:nbn:se:uu:diva-235525DOI: 10.3233/JAD-132042ISI: 000342237000011OAI: oai:DiVA.org:uu-235525DiVA: diva2:761104