title: Protocatechuic acid from Alpinia oxyphylla against MPP+-induced neurotoxicity in PC12 cells.
abstract: An ethyl acetate extract of Alpinia oxyphylla was found to possess neuroprotective activity against 1-methyl-4-phenylpyridinium ion (MPP(+)) induced apotosis and oxidative stress in cultured PC12 cells. From the extract, a phenolic compound was isolated through bioassay-guided fractionation and identified as protocatechuic acid (PCA) by IR, MS, and (1)H and (13)C NMR spectroscopy. It was the first time which was isolated from the kernels of A. oxyphylla. Exposure of PC12 cells to 1mM MPP(+) may cause significant viability loss and apoptotic cell death. PCA stimulated PC12 cellular proliferation and markedly attenuated MPP(+)-induced apoptotic cell death in a dose-dependent manner. By observing the nuclear morphological changes and flow cytometric analysis, PCA showed its significant effect on protecting PC12 cells against MPP(+)-induced apoptosis. Meanwhile, PCA enhanced the activities of superoxide dismutase (SOD) and catalase (CAT) in PC12 cells. In addition, PCA also dose-dependently reduced the hydrogen peroxide (H(2)O(2))- or sodium nitroprusside (SNP)-induced cell death in PC12 cells. The results suggest that PCA may be one of the primary active components in the kernels of A. oxyphylla and provide a useful therapeutic strategy for the treatment of oxidative stress-induced neurodegenerative disease such as Parkinson's disease.
authors.affiliation: Department of Bioscience and Biotechnology, Dalian University of Technology, PR China. guanshui_0518@hotmail.com
authors.forename: L J
authors.initials: LJ
authors.lastname: An
authors.forename: S
authors.initials: S
authors.lastname: Guan
authors.forename: G F
authors.initials: GF
authors.lastname: Shi
authors.forename: Y M
authors.initials: YM
authors.lastname: Bao
authors.forename: Y L
authors.initials: YL
authors.lastname: Duan
authors.forename: B
authors.initials: B
authors.lastname: Jiang
mesh_terms: D015655:1-Methyl-4-phenylpyridinium / Q000633:toxicity; D032429:Alpinia / Q000737:chemistry*; D000818:Animals; D017209:Apoptosis / Q000187:drug effects*; D002374:Catalase / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry; D006861:Hydrogen Peroxide; D062385:Hydroxybenzoates / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D018696:Neuroprotective Agents / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects; D016716:PC12 Cells; D010936:Plant Extracts / Q000494:pharmacology; D051381:Rats; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D062385:Hydroxybenzoates; D018696:Neuroprotective Agents; D010936:Plant Extracts; C009091:protocatechuic acid; D006861:Hydrogen Peroxide; D002374:Catalase; D013482:Superoxide Dismutase; D015655:1-Methyl-4-phenylpyridinium