Baicalein Protects against 6-OHDA-Induced Neurotoxicity through Activation of Keap1/Nrf2/HO-1 and Involving PKC alpha and PI3K/AKT Signaling Pathways
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AbstractBaicalein, one of the major flavonoids found in Scutellaria baicalensis Georgi, displays neuroprotective effects on experimental models of Parkinson's disease (PD) in vitro and in vivo. Although the antioxidative and/or anti-inflammatory activity of baicalein likely contributes to these neuroprotective effects, other modes of action remain largely uncharacterized. In the present study, baicalein pretreatment significantly prevented cells from 6-hydroxydopamine (6-OHDA)-induced damage by attenuating cellular apoptosis. However, post-treatment with baicalein did not show any restorative effect against 6-OHDA-induced cellular damage. We found that baicalein increased transcriptional factor NF-E2-related factor 2 (Nrf2)/hemo oxygenase 1(HO-1) protein expression and decreased Kelch-like ECH-associated protein 1 (Keap1) in a time- and concentration-dependent manner in PC12 cells. In addition, baicalein induced Nrf2 nuclear translocation and enhanced antioxidant response element (ARE) transcriptional activity, which conferred cytoprotection against 6-OHDA-induced oxidative injury. Moreover, we demonstrated that cytoprotective effects of baicalein could be attenuated by Nrf2, siRNA transfection and the HO-1 inhibitor zinc protoporphyrin (Znpp) as well as the proteasome inhibitor MG132. Furthermore, PKC alpha and AKT protein phosphorylation were up-regulated by baicalein pretreatment, and selective inhibitors targeted to PKC, PI3K, and AKT could block the cytoprotective effects of baicalein. Taken together, our results indicate that baicalein prevented PC12 cells from 6-OHDA-induced oxidative damage via the activation of Keap1/Nrf2/HO-1, and it also involves the PKC alpha and PI3K/AKT signaling pathway. Ultimately, the neuroprotective effects of baicalein may endue baicalein as a promising candidate for the prevention of PD.
All Author(s) ListZhang ZJ, Cui W, Li GH, Yuan S, Xu DP, Hoi MPM, Lin ZX, Dou J, Han YF, Lee SMY
Journal nameJournal of Agricultural and Food Chemistry
Year2012
Month8
Day22
Volume Number60
Issue Number33
PublisherAMER CHEMICAL SOC
Pages8171 - 8182
ISSN0021-8561
eISSN1520-5118
LanguagesEnglish-United Kingdom
Keywords6-OHDA; baicalein; neuroprotection; Nrf2; oxidative stress; Parkinson's disease
Web of Science Subject CategoriesAgriculture; Agriculture, Multidisciplinary; AGRICULTURE, MULTIDISCIPLINARY; Chemistry; Chemistry, Applied; CHEMISTRY, APPLIED; Food Science & Technology; FOOD SCIENCE & TECHNOLOGY

Last updated on 2020-03-06 at 00:58