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Phosphatidylinositol 3 kinase/protein kinase B is responsible for the protection of paeoniflorin upon H2O2-induced neural progenitor cell injury.

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    • Abstract:
      Abstract: Promoting neural stem/progenitor cell (NSC/NPC) survival in the pro-apoptotic environment is critical to stem cell replacement for neurodegenerative disease therapy. Paeoniflorin (PF), one of the principal bioactive components in Paeoniae Radix, has been used widely in central nervous system (CNS) diseases treatment and serves as an antioxidant to protect neurons against oxidative stress. The present study investigated the protective effects of PF on NPC injury induced by hydrogen peroxide (H2O2). After challenge with 200μM H2O2 for 2h, loss of cell viability and excessive apoptotic cell death were observed in cultured NPC, PF treatment conferred protective effects against the loss of cellular viability in a concentration-dependent manner. PF pretreatment also inhibited NPC apoptosis induced by H2O2 by reversing the decreased level of Procaspase-3 and balancing Bcl-2 and Bax expression. Furthermore, PF-mediated NPC protection was associated with an increase in phosphatidylinositol 3 kinase (PI3K)/protein kinase B (Akt-1) phosphorylation in a time- and concentration-dependent manner. Selective inhibition of PI3K using LY294002 abolished PF-mediated phosphorylation of Akt-1 and NPC protection upon oxidative stress. These data suggest that PF-mediated NPC protection on H2O2 injury is reliant on the activation of the PI3K/Akt-1 pathway, giving insight to an essential role of PF in NPC protection. [Copyright &y& Elsevier]
    • Abstract:
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