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language
eng
Author
Inoue, Takayuki Department of Environmental Physiology, Shimane University Faculty of Medicine, Izumo, Shimane, Japan.
Hashimoto, Michio
Katakura, Masanori
Shahdat Hossain
Description
Background
Arachidonic acid (AA, C20:4, ω-6) is a ω-6 polyunsaturated fatty acid (PUFA) and plays diverse roles in cell signaling. Numerous reports on the effects of ω-3 PUFAs, such as docosahexaenoic acid (DHA, C22:6, ω-3) and eicosapentaenoic acid (EPA, C20:5, ω-3) on learning and memory impairments of rats are available, however, the role of AA on brain cognition is largely unknown.

Objective
In this study, our aim was to investigate the effect of oral administration of AA on spatial memory-related learning ability in aged (100 weeks) male rats.

Design
One group was per orally administered 240 mg/kg per day AA oil and the other group was administered the similar volume of control oil. Five weeks after the start of the administration, rats were tested with the partially baited eight-arm radial maze to evaluate two types of spatial memory-related learning ability displayed by reference memory errors (RMEs) and working memory errors (WMEs). Also, the time required to complete the task was recorded. The levels of lipid peroxide (LPO) and reactive oxygen species (ROS) were measured, as an indicator oxidative stress in the plasma and brain corticohippocampal brain tissues.

Results
The scores of RMEs and WMEs, which are analogous to long-term and short-term memory, respectively, were not affected, however, the trial time was shorter in the AA-administered rats than that of the controls. AA also significantly increased the degree of oxidative stress both in the plasma and corticohippocampal brain tissues.

Conclusions
Our results suggest that though AA deposition in the corticohippocampal tissues of senescent rats caused a faster performance activity, which is reminiscent to hyperactive behavior of animals, the spatial learning ability-related memory of the rats, however, was not improved.
Subject
arachidonic acid
spatial learning
senescent
reference and working memory
radial maze
Journal Title
Food & nutrition research
Volume
63
ISSN
1654-661X
Published Date
2019
DOI
PubMed ID
Publisher
1654-661X
NII Type
Journal Article
Format
PDF
Text Version
出版社版
Gyoseki ID
e36630
OAI-PMH Set
Faculty of Medicine