Abstract
It has been reported in recent years that blood levels of plasmalogens (Pls) are decreased in various diseases. None of those reports, however, conducted any clinical trials to examine the effect of Pls on those diseases. This article describes our recent report on a therapeutic efficacy of orally administered Pls in mild cognitive impairment (MCI), mild to severe Alzheimer’s disease (AD), and Parkinson’s disease (PD). A 24-week, multicenter, randomized, double-blind, placebo-controlled trial was performed in patients with MCI (n = 178) and mild AD (n = 98). The study design for moderate AD (n = 57) and severe AD (n = 18) was 12-week open-labeled, and the design for patients with PD (n = 10) was 24-week open-labeled. They showed a significant improvement in cognitive function and other clinical symptoms with elevation of the blood Pls levels. No adverse events were reported. The baseline levels of plasma ethanolamine plasmalogen and erythrocyte ethanolamine plasmalogen in MCI, AD, and PD were significantly lower than those of normal aged. The degree of reduction in the blood Pls levels was in the order of MCI ≺ mild AD ≺ moderate AD ≺ severe AD ≺ PD. The findings suggest that the blood levels of Pls may be a beneficial biomarker for assessing AD severity. Based on these results, we have proposed a new hypothesis for the etiology of AD and other neuropsychiatric disorders.
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The authors are grateful to Ms. Chizuko Kanemaru and Ms. Chikako Wakana for their support in preparing the manuscript.
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Fujino, T., Hossain, M.S., Mawatari, S. (2020). Therapeutic Efficacy of Plasmalogens for Alzheimer’s Disease, Mild Cognitive Impairment, and Parkinson’s Disease in Conjunction with a New Hypothesis for the Etiology of Alzheimer’s Disease. In: Lizard, G. (eds) Peroxisome Biology: Experimental Models, Peroxisomal Disorders and Neurological Diseases. Advances in Experimental Medicine and Biology, vol 1299. Springer, Cham. https://doi.org/10.1007/978-3-030-60204-8_14
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