Lycium barbarum polysaccharide protects against neurotoxicity via the Nrf2‑HO‑1 pathway

Cao,Shumei; Du,Jianlong; Hei,Qiaohong

doi:10.3892/etm.2017.5127

Lycium barbarum polysaccharide protects against neurotoxicity via the Nrf2‑HO‑1 pathway

Authors:
- Shumei Cao
- Jianlong Du
- Qiaohong Hei
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Affiliations: Department of Anesthesiology, Xi'an No. 1 Hospital, Xi'an, Shaanxi 710002, P.R. China, Department of Anesthesiology, No. 215 Hospital of Shaanxi Nuclear Industry, Xianyang, Shaanxi 712000, P.R. China, Department of Anesthesiology, Xi'an High‑Tech Hospital, Xi'an, Shaanxi 710075, P.R. China
Published online on: September 19, 2017 https://doi.org/10.3892/etm.2017.5127
Pages: 4919-4927
Copyright: © Cao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The incidence of neurodegenerative diseases including Alzheimer's and Parkinson's disease has markedly increased over the past few decades. Oxidative stress is considered to be a common pathophysiological condition resulting in neurotoxicity. Lycium barbarum polysaccharide (LBP) is the major active component of Lycium barbarum L., which exhibit potent antioxidant activity. The current study investigated the neuroprotective effects of LBP in H2O2‑treated PC12 cells in vitro and in CoCl2‑treated rats in vivo. It was determined that LBP concentration‑dependently reversed the H2O2‑induced increase in reactive oxygen species (ROS) levels, decrease in cell viability, increase in TUNEL‑stained cells, increase in caspase‑3 and ‑9 activity and decrease in mitochondrial membrane potential, indicating the amelioration of mitochondrial apoptosis. Furthermore, LBP inhibited the H2O2‑induced decrease in nuclear factor erythroid 2‑related factor 2 (Nrf)2 and heme oxygenase (HO)‑1 expression and binding of Nrf2 to the promoters of HO‑1. Silencing of Nrf2 and inhibition of HO‑1 by zinc protoporphyrin IX (ZnPP) reversed the protective effects of LBP against H2O2‑resulted neurotoxicity in PC12 cells. In CoCl2‑treated rats, it was demonstrated that LBP decreased brain tissue apoptosis, reduced the time spent by rats finding the platform site, decreased escape latencies and reduced the distance traveled to find the platform. In addition, LBP inhibited the CoCl2‑induced decrease of Nrf2 and HO‑1 expression. Administration of ZnPP also suppressed the protective effects of LBP against CoCl2‑resulted neurotoxicity in rats. Thus, the current study indicated that LBP exhibits protective effects against neurotoxicity by upregulating Nrf2/HO‑1 signaling. These data may increase understanding regarding the neuroprotective activities of LBP.

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