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2015 ; 21
(11
): 905-13
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TLR3 ligand Poly IC Attenuates Reactive Astrogliosis and Improves Recovery of
Rats after Focal Cerebral Ischemia
#MMPMID26494128
Li Y
; Xu XL
; Zhao D
; Pan LN
; Huang CW
; Guo LJ
; Lu Q
; Wang J
CNS Neurosci Ther
2015[Nov]; 21
(11
): 905-13
PMID26494128
show ga
AIMS: Brain ischemia activates astrocytes in a process known as astrogliosis.
Although this process has beneficial effects, excessive astrogliosis can impair
neuronal recovery. Polyinosinic-polycytidylic acid (Poly IC) has shown
neuroprotection against cerebral ischemia-reperfusion injury, but whether it
regulates reactive astrogliosis and glial scar formation is not clear. METHODS:
We exposed cultured astrocytes to oxygen-glucose deprivation/reoxygenation
(OGD/R) and used a rat middle cerebral artery occlusion (MCAO)/reperfusion model
to investigate the effects of Poly IC. Astrocyte proliferation and
proliferation-related molecules were evaluated by immunostaining and Western
blotting. Neurological deficit scores, infarct volumes and neuroplasticity were
evaluated in rats after transient MCAO. RESULTS: In vitro, Poly IC inhibited
astrocyte proliferation, upregulated Toll-like receptor 3 (TLR3) expression,
upregulated interferon-?, and downregulated interleukin-6 production. These
changes were blocked by a neutralizing antibody against TLR3, suggesting that
Poly IC function is TLR3-dependent. Moreover, in the MCAO model, Poly IC
attenuated reactive astrogliosis, reduced brain infarction volume, and improved
neurological function. In addition, Poly IC prevented MCAO-induced reductions in
soma size, dendrite length, and number of dendritic bifurcations in cortical
neurons of the infarct penumbra. CONCLUSIONS: By ameliorating
astrogliosis-related damage, Poly IC is a potential therapeutic agent for
attenuating neuronal damage and promoting recovery after brain ischemia.