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Late-life environmental enrichment preserves short-term memory and may attenuate microglia in male APP/PS1 mice

Citation

Stuart, KE and King, AE and King, NE and Collins, JM and Vickers, JC and Ziebell, JM, Late-life environmental enrichment preserves short-term memory and may attenuate microglia in male APP/PS1 mice, Neuroscience, 408 pp. 282-292. ISSN 0306-4522 (2019) [Refereed Article]

Copyright Statement

Copyright 2019 IBRO

DOI: doi:10.1016/j.neuroscience.2019.04.015

Abstract

Environmental enrichment (EE) has been consistently reported to enhance cognitive function in mouse models of neuropathology. Microglia, implicated in Alzheimer's disease pathology, may mediate this effect. The aim of the present study was to investigate the effect of EE on cognitive function and microglia in mouse models of aging and amyloidosis. Male wild-type (Wt) and APP/PS1 mice were randomly assigned to standard housing (SH) or EE from 12 to 18 months of age. Spatial memory testing was performed using the Y and Barnes maze. Immunohistochemical analysis of Aβ load, Iba1 and CD-68-labeled (phagocytic-type) microglia was examined between conditions. EE from 12 months of age was associated with improved short-term memory performance in APP/PS1 mice, despite no reductions to Aβ load. APP/PS1 mice in SH had significantly increased microglia occupying the neocortex and hippocampus (p = 0.02; p = 0.004, respectively) relative to Wt animals. Microglia labeling was not statistically different between EE-exposed APP/PS1 compared to Wt mice, indicating that EE may attenuate the increased microglial load in aging APP/PS1 mice. APP/PS1 mice from EE had significantly (p = 0.01) higher colocalization of Iba1 and CD-68 labeling, indicative of increased phagocytic microglia compared to mice from SH. The findings of the present study suggest that EE after substantial brain amyloidosis, has the potential to preserve domains of cognitive function, while having no effect on Aβ deposition. The current study demonstrates that EE may attenuate microglia in aging APP/PS1 mice, and may promote alterations in cellular phenotype.

Item Details

Item Type:Refereed Article
Keywords:Alzheimer's disease, microglia, environmental enrichment, aging, APP/PS1 mouse model
Research Division:Medical and Health Sciences
Research Group:Neurosciences
Research Field:Cellular Nervous System
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Neurodegenerative Disorders Related to Ageing
UTAS Author:Stuart, KE (Miss Katherine Stuart)
UTAS Author:King, AE (Professor Anna King)
UTAS Author:King, NE (Miss Natalie King)
UTAS Author:Collins, JM (Dr Jessica Collins)
UTAS Author:Vickers, JC (Professor James Vickers)
UTAS Author:Ziebell, JM (Dr Jenna Ziebell)
ID Code:132601
Year Published:2019
Deposited By:Wicking Dementia Research and Education Centre
Deposited On:2019-05-14
Last Modified:2019-07-31
Downloads:0

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