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アルツハイマー病の病態において酸化ストレスの関与が考えられている。疫学研究では,抗酸化物質であるビタミンEを多く摂取する高齢者は,アルツハイマー病の発症が少ないと報告されている。一方,健常高齢女性や軽度認知障害を対象としたランダム化比較試験ではビタミンEの認知機能低下抑制効果は証明できなかった。今後,適切にデザインされた臨床試験により,ビタミンEのアルツハイマー病予防効果が検証されることが望まれる。
Abstract
It has been suggested that oxidative stress may contribute to the pathogenesis of Alzheimer's disease. Vitamin E is a potent antioxidant, and the results of some epidemiological studies have suggested that high intake of vitamin E through food is inversely associated with the incidence of Alzheimer's disease. Randomized controlled studies have shown that treatment with vitamin E could delay functional decline in patients with mild to moderate Alzheimer's disease. However, vitamin E had no cognitive benefits in patients with mild cognitive impairment or in generally healthy older women. Well-designed clinical trials or preventive interventions with vitamin E are necessary to establish its efficacy as therapeutic or preventive agents for Alzheimer's disease.
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