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2017 ; 50
(ä): 96-106
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White matter damage and glymphatic dysfunction in a model of vascular dementia in
rats with no prior vascular pathologies
#MMPMID27940353
Venkat P
; Chopp M
; Zacharek A
; Cui C
; Zhang L
; Li Q
; Lu M
; Zhang T
; Liu A
; Chen J
Neurobiol Aging
2017[Feb]; 50
(ä): 96-106
PMID27940353
show ga
We investigated cognitive function, axonal/white matter (WM) changes and
glymphatic function of vascular dementia using a multiple microinfarction (MMI)
model in retired breeder (RB) rats. The MMI model induces significant (p < 0.05)
cognitive decline that worsens with age starting at 2 weeks, which persists until
at least 6 weeks after MMI. RB rats subjected to MMI exhibit significant
axonal/WM damage identified by decreased myelin thickness, oligodendrocyte
progenitor cell numbers, axon density, synaptic protein expression in the cortex
and striatum, cortical neuronal branching, and dendritic spine density in the
cortex and hippocampus compared with age-matched controls. MMI evokes significant
dilation of perivascular spaces as well as water channel dysfunction indicated by
decreased Aquaporin-4 expression around blood vessels. MMI-induced glymphatic
dysfunction with delayed cerebrospinal fluid penetration into the brain
parenchyma via paravascular pathways as well as delayed waste clearance from the
brain. The MMI model in RB rats decreases Aquaporin-4 and induces glymphatic
dysfunction which may play an important role in MMI-induced axonal/WM damage and
cognitive deficits.