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Paeoniflorin, a Natural Neuroprotective Agent, Modulates Multiple Anti-Apoptotic and Pro-apoptotic Pathways in Differentiated PC12 Cells

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Abstract

Numerous studies have shown robust neuroprotective effects of paeoniflorin (PF), a natural compound derived from the herbal medicine Paeony radix. In the present study, we determined associations of PF neuroprotection with its modulation of various apoptotic and anti-apoptotic pathways. PF (50–400 μM) pretreatment significantly improved viability of differentiated PC12 cells exposed to methyl-4-phenylpyridine ion (MPP+), a neurotoxin, and inhibited over-release of lactate dehydrogenase, a biomarker of neuronal cell death. PF also ameliorated MPP+-induced nuclear and mitochondrial apoptotic alteration and intracellular calcium overload. PF treatment reversed MPP+ suppression of activity of B cell lymphoma-extra large, which is a mitochondrial membrane molecule that protects cells from DNA damage-induced apoptosis, and strikingly inhibited the enhanced level of cleaved poly(ADP-ribose)polymerase, which is involved in the process of apoptosis. PF alone and coadministration with MPP+ enhanced phospho activation of extracellular signal-regulated kinases, Akt, and its downstream element glycogen synthase kinase-3, but the effects were completely abolished in the presence of their blockers PD98059 and LY294002. The presence of the blockers also diminished the potency of PF in improving viability of MPP+-exposed cells. These results indicate that neuroprotective effects of PF are related to its modulation of multiple anti-apoptotic and pro-apoptotic pathways, including blockade of intracellular calcium overload, prevention of mitochondrial membrane integrity, inhibition of pro-apoptotic molecules, and up-regulation of anti-apoptotic proteins associated with cell survival and proliferation. The study provides evidence supporting PF as a potential therapeutic agent used for the treatment of neurodegenerative diseases and neural injury.

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Acknowledgments

This study was supported by the Health and Health Service Research Fund (HHSRF) (09101141) and the HKU intramural seed funds (201011159095, 201102160005).

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Authors and Affiliations

  1. School of Chinese Medicine, LKS Faculty of Medicine, The University of Hong Kong, 10 Sassoon Road, Pokfulam, Hong Kong, China

    Di Wang, Hei Kiu Wong, Yi-Bin Feng & Zhang-Jin Zhang

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  1. Di Wang
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  2. Hei Kiu Wong
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  3. Yi-Bin Feng
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Correspondence to Zhang-Jin Zhang.

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Wang, D., Wong, H.K., Feng, YB. et al. Paeoniflorin, a Natural Neuroprotective Agent, Modulates Multiple Anti-Apoptotic and Pro-apoptotic Pathways in Differentiated PC12 Cells. Cell Mol Neurobiol 33, 521–529 (2013). https://doi.org/10.1007/s10571-013-9914-y

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