Effects on Transthyretin in Plasma and Cerebrospinal Fluid by DHA-Rich n-3 Fatty Acid Supplementation in Patients with Alzheimer's Disease: The OmegAD Study
2013 (English)In: Journal of Alzheimer's Disease, ISSN 1387-2877, Vol. 36, no 1, 1-6 p.Article in journal (Refereed) Published
Transthyretin (TTR) binds amyloid-beta (A beta) and may reduce brain A beta, a pathological feature in Alzheimer's disease (AD). N - 3 fatty acids (FA), docosahexaenoic (DHA), and eicosapentaenoic acid (EPA) may increase TTR transcription in rat hippocampus. We studied effects of n - 3 FA supplementation on TTR-levels in patients with AD. Outpatients were randomized to receive 1.7 g DHA and 0.6 g EPA (n - 3/n - 3 group) or placebo (placebo/n - 3 group) during 6 months. After 6 months, all patients received n - 3 FA for another 6 months. TTR and FA were measured in plasma in all subjects, whereas TTR in cerebrospinal fluid (CSF) was measured in a subgroup. The study was completed by 89 patients in the n- 3/n - 3 group (75 y, 57% w) and 85 in the placebo/n - 3 group (75 y, 46% w). Baseline plasma - TTR was within normal range in both groups. After 6 months, plasma - TTR decreased in the placebo/n - 3 group (p < 0.001 within and p < 0.015 between the groups). No changes were observed in CSF TTR. From 6 to 12 months when both groups were supplemented, plasma - TTR increased significantly in both groups. Repeated measures ANOVA indicated an increase in TTR over time (p = 0.04) in those receiving n - 3 FA for 12 months. By linear regression analyses, n - 3 FA treatment was independently associated with increased plasma - TTR at 6 months (beta = -0.172, p = 0.028). Thus, n - 3 FA treatment appeared to increase plasma-TTR in patients with AD. Since TTR may influence A beta deposition in the brain, the results warrant further exploration.
Place, publisher, year, edition, pages
2013. Vol. 36, no 1, 1-6 p.
Alzheimer's disease, dementia, fatty acids, transthyretin
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:uu:diva-205413DOI: 10.3233/JAD-121828ISI: 000320030200001OAI: oai:DiVA.org:uu-205413DiVA: diva2:642122