Impaired fasting blood glucose is associated to cognitive impairment and cerebral atrophy in middle-aged non-human primates.

Abstract:

:Age-associated cognitive impairment is a major health and social issue because of increasing aged population. Cognitive decline is not homogeneous in humans and the determinants leading to differences between subjects are not fully understood. In middle-aged healthy humans, fasting blood glucose levels in the upper normal range are associated with memory impairment and cerebral atrophy. Due to a close evolutional similarity to Man, non-human primates may be useful to investigate the relationships between glucose homeostasis, cognitive deficits and structural brain alterations. In the grey mouse lemur, Microcebus murinus, spatial memory deficits have been associated with age and cerebral atrophy but the origin of these alterations have not been clearly identified. Herein, we showed that, on 28 female grey mouse lemurs (age range 2.4-6.1 years-old), age correlated with impaired fasting blood glucose (rs=0.37) but not with impaired glucose tolerance or insulin resistance. In middle-aged animals (4.1-6.1 years-old), fasting blood glucose was inversely and closely linked with spatial memory performance (rs=0.56) and hippocampus (rs=-0.62) or septum (rs=-0.55) volumes. These findings corroborate observations in humans and further support the grey mouse lemur as a natural model to unravel mechanisms which link impaired glucose homeostasis, brain atrophy and cognitive processes.

journal_name

Aging (Albany NY)

journal_title

Aging

authors

Djelti F,Dhenain M,Terrien J,Picq JL,Hardy I,Champeval D,Perret M,Schenker E,Epelbaum J,Aujard F

doi

10.18632/aging.101148

subject

Has Abstract

pub_date

2016-12-28 00:00:00

pages

173-186

issue

1

issn

1945-4589

pii

101148

journal_volume

9

pub_type

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