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2017 ; 23
(ä): 207-215
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Environmental Enrichment Improves Spatial Learning and Memory in Vascular
Dementia Rats with Activation of Wnt/?-Catenin Signal Pathway
#MMPMID28082734
Jin X
; Li T
; Zhang L
; Ma J
; Yu L
; Li C
; Niu L
Med Sci Monit
2017[Jan]; 23
(ä): 207-215
PMID28082734
show ga
BACKGROUND Environmental enrichment (EE) has a beneficial effect on some
neuropsychiatric disorders. In this study, we aimed to investigate whether
environmental enrichment could improve the spatial learning and memory in rats
with vascular dementia (VaD) and the mechanism underpinning it. MATERIAL AND
METHODS Bilateral common carotid occlusion (2-vessel occlusion [2VO]) was used to
develop the animal model of vascular dementia. Adult male Sprague-Dawley (SD)
rats were used in the experiment and were randomly divided into 4 groups: sham
group, 2VO group, sham+EE group, and 2VO+EE group (n=19/group). The 2VO group and
2VO+EE group underwent bilateral common carotid occlusion. Two different housing
conditions were used in this experiment: standard environment (SE) and enriched
environment (EE). Rats in the sham group and 2VO group were put into SE cages for
4 weeks, while rats in the sham+EE group and 2VO+EE group were put in EE cages
for 4 weeks. The Morris water maze and Y-maze were used to assess spatial
learning and memory. Apoptosis was detected by TUNEL. The damage of neurons in
the hippocampus was assessed by Nissl staining. The level of wnt pathway proteins
were detected by Western blot. RESULTS Compared with the 2VO group, the rats in
the 2VO+EE group had better behavioral performance, fewer apoptotic neurons, and
more surviving neurons. Western blot analysis showed that the levels of wnt
pathway proteins were higher in 2VO+EE rats than in the 2VO group. CONCLUSIONS
Environmental enrichment can improve the spatial learning and memory in rats with
vascular dementia, and the mechanism may be related to activation of the
wnt/?-catenin signal pathway.