Effects of dietary nucleoside-nucleotide mixture on memory in aged and young memory deficient mice.

Abstract:

:Intestinal mucosa, bone marrow hematopoietic cells and brain have limited capacity for the de novo synthesis of nucleosides (NSs) and nucleotides (NTs). Whereas the role of dietary NS and NT in the former two tissues is known, it is not known in the brain. Therefore we studied the effect of dietary NS and NT mixture on memory in aged mice (Experiment 1) and young memory deficient mice (Experiment 2). Memory retention was studied by step-through type passive avoidance performance (maximum 180 seconds). In Experiment 1 aged (7 month old) senescence accelerated mice (SAM) were fed 20% casein diet (control) or this diet supplemented with 0.5% NS/NT mixture for 12 weeks. Memory was studied 1, 2 and 3 days after the electric shock (punishment). In Experiment 2, young (1 month old) memory deficient mice (Dull mice) and normal mice (ddY mice) were fed the same diets as those in Experiment 1 for 12 weeks. Memory retention was studied 1 and 3 days after the punishment. In the aged SAM the average time of avoidance and also the percentages of successful memory 2 and 3 days after the punishment were significantly higher in the NS/NT diet group than the control diet group (P < 0.05). In the Dull mice percentage of successful memory was higher in the NS/NT diet group than in the control group 3 days after the punishment, however, such an effect was not observed in the normal mice. These results suggest that insufficient endogenous supply of NSs and NTs may be responsible for the factor of memory deficiency with aging or of genetical memory deficiency, which can be improved by the dietary administration of NSs and NTs.

journal_name

Life Sci

journal_title

Life sciences

authors

Chen TH,Huang HP,Matsumoto Y,Wu SH,Wang MF,Chung SY,Uezu K,Moriyama T,Uezu E,Korin T,Sato S,Yamamoto S

doi

10.1016/0024-3205(96)00526-7

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

PL325-30

issue

21

eissn

0024-3205

issn

1879-0631

pii

0024320596005267

journal_volume

59

pub_type

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