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Cell Mol Neurobiol
2015 Nov 01;358:1081-92. doi: 10.1007/s10571-015-0202-x.
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Sulfated Polysaccharide Isolated from the Sea Cucumber Stichopus japonicus Against PC12 Hypoxia/Reoxygenation Injury by Inhibition of the MAPK Signaling Pathway.
Cui C
,
Cui N
,
Wang P
,
Song S
,
Liang H
,
Ji A
.
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In this report, the sulfated polysaccharide (SJP) isolated from the sea cucumber Stichopus japonicus can protect PC12 from Na2S2O4-induced hypoxia/reoxygenation (H/R) injury. SJP effectively improves cell viability and reduces extracellular LDH release in PC12 cells after H/R. Moreover, SJP significantly increases SOD activity but decreases MDA levels. Our experiments showed that SJP could significantly reduce cell apoptosis caused by H/R. Our current results demonstrate that SJP suppressed the activation of MAPKs, resulting in a significant decrease in Bax/Bcl-2 ratio, cleaved caspase-3/caspase-3, p53 phosphorylation, and cytochrome c release in a concentration-dependent manner. MAPK is closely related to H/R injury. SJP inhibited JNK1/2 and p38 MAPK activation but did not affect the increased ERK1/2 expression. These results suggested that JNK1/2 and p38 MAPK pathways could be involved in SJP-mediated attenuation of PC12 H/R injury. SJP prevented PC12 H/R injury in a dose-dependent manner, indicating that SJP may be developed as a candidate drug to prevent or treat cerebral ischemia-reperfusion injury.
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