Nutr Res Pract.  2021 Apr;15(2):173-186. 10.4162/nrp.2021.15.2.173.

Effects of the fermented Zizyphus jujuba in the amyloid β25-35 -induced Alzheimer's disease mouse model

Affiliations
  • 1Department of Food Science and Nutrition, Pusan National University, Busan 46241, Korea
  • 2Department of Plant Science and Technology, Chung-Ang University, Anseong 17546, Korea
  • 3Department of Food Science, Gyeongnam National University of Science and Technology, Jinju 52725, Korea

Abstract

BACKGROUD/OBJECTIVES: Alzheimer's disease (AD) is the most common cause of dementia in the elderly. Due to the increased incidence of dementia, there is a corresponding increase concerning the importance of AD. In this study, we investigated the protective effects conferred by Zizyphus jujuba (Zj) and Zizyphus jujuba fermented by yeast (Zj-Y), on cognitive impairment in an AD mouse model.
MATERIALS/METHODS
AD was induced by injecting amyloid beta25-35 (Aβ25-35 ) in ICR mice, and subsequently 200 mg/kg Zj or Zj-Y was administered daily for 14 days. The cognitive ability of AD mice was observed through behavioral experiments in T-maze, novel object recognition, and Morris water maze tests. We subsequently measured the levels of malondialdehyde (MDA), nitric oxide (NO), aspartate aminotransferase, and alanine aminotransferase in either tissues or serum.
RESULTS
In behavioral tests, deterioration was revealed in the short- and long-term learning and memory functions in the Aβ25-35 -injected control group compared to the normal group, indicating that Aβ25-35 injection impairs cognitive functions. However, administration of Zj and Zj-Y improved cognitive function in mice, as compared to the Aβ25-35 -injected control mice. In addition, the Aβ25-35 induced elevations of MDA and NO in the brain, kidney, and liver were suppressed after exposure to Zj and Zj-Y. Especially, Zj-Y showed stronger scavenging effect against MDA and NO, as compared to Zj.
CONCLUSIONS
Results of the present study indicate that Zj-Y exerts a protective effect on cognitive impairment and memory dysfunction, which is exerted by attenuating the oxidative stress induced by Aβ25-35 .

Keyword

Alzheimer's disease; amyloid; fermentation; mice; ziziphus
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