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2016 ; 8
(332
): 332ra44
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Neuronal heparan sulfates promote amyloid pathology by modulating brain amyloid-?
clearance and aggregation in Alzheimer s disease
#MMPMID27030596
Liu CC
; Zhao N
; Yamaguchi Y
; Cirrito JR
; Kanekiyo T
; Holtzman DM
; Bu G
Sci Transl Med
2016[Mar]; 8
(332
): 332ra44
PMID27030596
show ga
Accumulation of amyloid-? (A?) peptide in the brain is the first critical step in
the pathogenesis of Alzheimer's disease (AD). Studies in humans suggest that A?
clearance from the brain is frequently impaired in late-onset AD. A? accumulation
leads to the formation of A? aggregates, which injure synapses and contribute to
eventual neurodegeneration. Cell surface heparan sulfates (HSs), expressed on all
cell types including neurons, have been implicated in several features in the
pathogenesis of AD including its colocalization with amyloid plaques and
modulatory role in A? aggregation. We show that removal of neuronal HS by
conditional deletion of the Ext1 gene, which encodes an essential
glycosyltransferase for HS biosynthesis, in postnatal neurons of amyloid model
APP/PS1 mice led to a reduction in both A? oligomerization and the deposition of
amyloid plaques. In vivo microdialysis experiments also detected an accelerated
rate of A? clearance in the brain interstitial fluid, suggesting that neuronal HS
either inhibited or represented an inefficient pathway for A? clearance. We found
that the amounts of various HS proteoglycans (HSPGs) were increased in postmortem
human brain tissues from AD patients, suggesting that this pathway may contribute
directly to amyloid pathogenesis. Our findings have implications for AD
pathogenesis and provide insight into therapeutic interventions targeting A?-HSPG
interactions.