The European perspective on vitamin E: Current knowledge and future research

Regina Brigelius-Flohé, Frank J. Kelly, Jukka T. Salonen, Jiri Neuzil, Jean Marc Zingg, Angelo Azzi

Research output: Contribution to journalReview articlepeer-review

480 Scopus citations

Abstract

Vitamin E is indispensible for reproduction in female rats. In humans, vitamin E deficiency primarily causes neurologic dysfunctions, but the underlying molecular mechanisms are unclear. Because of its antioxidative properties, vitamin E is believed to help prevent diseases associated with oxidative stress, such as cardiovascular disease, cancer, chronic inflammation, and neurologic disorders. However, recent clinical trials undertaken to prove this hypothesis failed to verify a consistent benefit. Given these findings, a group of European scientists met to analyze the most recent knowledge of vitamin E function and metabolism. An overview of their discussions is presented in this article, which includes considerations of the mechanisms of absorption, distribution, and metabolism of different forms of vitamin E, including the α-tocopherol transfer protein and α-tocopherol-associated proteins; the mechanism of tocopherol side-chain degradation and its putative interaction with drug metabolism; the usefulness of tocopherol metabolites as biomarkers; and the novel mechanisms of the antiatherosclerotic and anticarcinogenic properties of vitamin E, which involve modulation of cellular signaling, transcriptional regulation, and induction of apoptosis. Clinical trials were analyzed on the basis of the selection of subjects, the stage of disease, and the mode of intake, dosage, and chemical form of vitamin E. In addition, the scarce knowledge on the role of vitamin E in reproduction was summarized. In conclusion, the scientists agreed that the functions of vitamin E were underestimated if one considered only its antioxidative properties. Future research on this essential vitamin should focus on what makes it essential for humans, why the body apparently utilizes α-tocopherol preferentially, and what functions other forms of vitamin E have.

Original languageEnglish (US)
Pages (from-to)703-716
Number of pages14
JournalAmerican Journal of Clinical Nutrition
Volume76
Issue number4
DOIs
StatePublished - Oct 2002
Externally publishedYes

Keywords

  • Binding proteins
  • Chemical forms
  • Metabolism
  • Novel functions
  • Vitamin E

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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