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2018 ; 24
(ä): 1588-1596
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Recombinant Osteopontin Improves Neurological Functional Recovery and Protects
Against Apoptosis via PI3K/Akt/GSK-3? Pathway Following Intracerebral Hemorrhage
#MMPMID29550832
Zhang W
; Cui Y
; Gao J
; Li R
; Jiang X
; Tian Y
; Wang K
; Cui J
Med Sci Monit
2018[Mar]; 24
(ä): 1588-1596
PMID29550832
show ga
BACKGROUND This study aimed to investigate the potential neuroprotective effect
of recombinant osteopontin (r-OPN) on apoptotic changes via modulating
phosphoinositide-3-kinase/Akt/glycogen synthase kinase 3 beta (PI3K/Akt/GSK-3?)
signaling in a rat model of intracerebral hemorrhage (ICH). MATERIAL AND METHODS
We subjected 10-12-week-old Sprague-Dawley male rats (n=120) to injection of
autologous blood into the right basal ganglia to induce ICH or sham surgery. ICH
animals received vehicle administration, r-OPN (4 ?L/pup), or r-OPN combined with
phosphatidylinositol 3-kinase (PI3K) inhibitor wortmannin (86 ng/pup) at 30 min
after injury. Neurological scores and rotarod latencies were evaluated on days
1-5 post-ICH. Brain water content was evaluated on days 1-3 post-ICH. The number
of apoptotic cells changes were evaluated by terminal deoxynucleotidyl
transferase-mediated 2-deoxyuridine 5-triphosphate-biotin nick-end labeling
(TUNEL) and hematoxylin staining. Apoptosis-related proteins Bcl-2, Bax, and
cleaved caspase-3 (CC3), and the phosphorylation levels of Akt and GSK-3b were
assayed by Western blot. RESULTS Neurological deficits, rotarod latencies, and
brain water content following ICH were reduced in the r-OPN group compared to the
vehicle group. r-OPN also attenuated cell death in ICH. Furthermore, treatment
with r-OPN significantly increased p-Akt expression and decreased p-GSK-3?. These
effects were associated with a decrease in the Bax/Bcl-2 ratio and the
suppression of CC3 at 24 h after ICH. Importantly, all the beneficial effects of
r-OPN in ICH were abrogated by the PI3K inhibitor wortmannin. CONCLUSIONS r-OPN
may provide a wide range of neuroprotection by suppressing apoptosis through the
PI3K/Akt/GSK-3? signaling pathway after ICH.