High plasma levels of vitamin E forms and reduced Alzheimer's disease risk in advanced age

Francesca Mangialasche, Miia Kivipelto, Patrizia Mecocci, Debora Rizzuto, Katie Palmer, Bengt Winblad, Laura Fratiglioni

Research output: Contribution to journalArticle

Abstract

In this study we investigated the association between plasma levels of eight forms of vitamin E and incidence of Alzheimer's disease (AD) among oldest-old individuals in a population-based setting. A dementia-free sample of 232 subjects aged 80+ years, derived from the Kungsholmen Project, was followed-up to 6 years to detect incident AD. Plasma levels of vitamin E (α-, β-, γ, and δ-tocopherol; α-, β-, γ-, and δ-tocotrienol) were measured at baseline. Vitamin E forms-AD association was analyzed with Cox proportional hazard model after adjustment for several potential confounders. Subjects with plasma levels of total tocopherols, total tocotrienols, or total vitamin E in the highest tertile had a reduced risk of developing AD in comparison to persons in the lowest tertile. Multi-adjusted hazard ratios (HRs) and 95% confidence interval (CI) were 0.55 (0.32-0.94) for total tocopherols, 0.46 (0.23-0.92) for total tocotrienols, and 0.55 (0.32-0.94) for total vitamin E. When considering each vitamin E form, the risk of developing AD was reduced only in association with high plasma levels of β-tocopherol (HR: 0.62, 95% CI 0.39-0.99), whereas α-tocopherol, α- tocotrienol, and β-tocotrienol showed only a marginally significant effect in the multiadjusted model [HR (95% CI): α-tocopherol: 0.72 (0.48-1.09); α-tocotrienol: 0.70 (0.44-1.11); β-tocotrienol: 0.69 (0.45-1.06)]. In conclusion, high plasma levels of vitamin E are associated with a reduced risk of AD in advanced age. The neuroprotective effect of vitamin E seems to be related to the combination of different forms, rather than to α-tocopherol alone, whose efficacy in interventions against AD is currently debated.

Original languageEnglish
Pages (from-to)1029-1037
Number of pages9
JournalJournal of Alzheimer's Disease
Volume20
Issue number4
DOIs
Publication statusPublished - 2010

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Keywords

  • Alzheimer's disease
  • elderly
  • oxidative stress
  • tocopherol
  • tocotrienol
  • vitamin E

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Geriatrics and Gerontology
  • Clinical Psychology
  • Medicine(all)

Cite this

Mangialasche, F., Kivipelto, M., Mecocci, P., Rizzuto, D., Palmer, K., Winblad, B., & Fratiglioni, L. (2010). High plasma levels of vitamin E forms and reduced Alzheimer's disease risk in advanced age. Journal of Alzheimer's Disease, 20(4), 1029-1037. https://doi.org/10.3233/JAD-2010-091450