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Current Alzheimer Research

Editor-in-Chief

ISSN (Print): 1567-2050
ISSN (Online): 1875-5828

Research Article

Effects of Molecular Hydrogen Assessed by an Animal Model and a Randomized Clinical Study on Mild Cognitive Impairment

Author(s): Kiyomi Nishimaki, Takashi Asada*, Ikuroh Ohsawa, Etsuko Nakajima, Chiaki Ikejima, Takashi Yokota, Naomi Kamimura and Shigeo Ohta*

Volume 15 , Issue 5 , 2018

Page: [482 - 492] Pages: 11

DOI: 10.2174/1567205014666171106145017

open access plus

Abstract

Background: Oxidative stress is one of the causative factors in the pathogenesis of neurodegenerative diseases including mild cognitive impairment (MCI) and dementia. We previously reported that molecular hydrogen (H2) acts as a therapeutic and preventive antioxidant.

Objective: We assess the effects of drinking H2-water (water infused with H2) on oxidative stress model mice and subjects with MCI.

Methods: Transgenic mice expressing a dominant-negative form of aldehyde dehydrogenase 2 were used as a dementia model. The mice with enhanced oxidative stress were allowed to drink H2-water. For a randomized double-blind placebo-controlled clinical study, 73 subjects with MCI drank ~300 mL of H2-water (H2-group) or placebo water (control group) per day, and the Alzheimer's Disease Assessment Scale-cognitive subscale (ADAS-cog) scores were determined after 1 year.

Results: In mice, drinking H2-water decreased oxidative stress markers and suppressed the decline of memory impairment and neurodegeneration. Moreover, the mean lifespan in the H2-water group was longer than that of the control group. In MCI subjects, although there was no significant difference between the H2- and control groups in ADAS-cog score after 1 year, carriers of the apolipoprotein E4 (APOE4) genotype in the H2-group were improved significantly on total ADAS-cog score and word recall task score (one of the sub-scores in the ADAS-cog score).

Conclusion: H2-water may have a potential for suppressing dementia in an oxidative stress model and in the APOE4 carriers with MCI.

Keywords: ADAS-cog score, aldehyde dehydrogenase 2, ApoE4, hydrogen, hydrogen water, mild cognitive impairment, oxidative stress, randomized clinical study.


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