title: Effect of sesaminol glucosides on beta-amyloid-induced PC12 cell death through antioxidant mechanisms.
abstract: Several lines of evidence support that beta-amyloid (Abeta)-induced neurotoxicity is mediated through the generation of reactive oxygen species (ROS) and elevation of intracellular calcium. In this study, we have investigated protective effects of sesaminol glucosides on Abeta-induced oxidative cell death in cultured rat pheochromocytoma (PC12) cells. Sesaminol glucoside (50-250microg/ml) decreased Abeta(25-35)-induced ROS generation, formation of 8-oxodG, a form of oxidative DNA and elevation of intracellular calcium level concomitant with prevention of apoptotic cell death dose dependently. Sesaminol glucoside (50-250microg/ml) also effectively decreased Abeta1-42 and ADDL form of Abeta1-42 as well as the combination of H2O2 with FeSO4-induced cell damages. In mechanistic study, sesaminol glucosides attenuated Abeta25-35-induced activation of redox transcription factor nuclear factor-kappaB NF-kappaB through inhibition of p50 translocation and IkappaB phosphorylation, and blocked NF-kappaB-dependent luciferase activity in addition to the inhibitory effect on Abeta25-35-induced activation of ERK kinase signal pathway. Consistent with the inhibitory effect on Abeta25-35-induced stress-induced cell death, sesaminol glucosides decreased expression of pro-apoptotic gene p53, and Bax and caspase-3, but enhanced expression of anti-apoptotic Bcl-2. Moreover, the protective effects of sesaminol glucoside on Abeta25-35-induced ROS generation, NF-kappaB activation and cell death were further enhanced with glutathione. This study therefore suggests that sesaminol glucosides have protective effect on Abeta-induced neuronal cell death, and its effect may be through antioxidative property.
authors.affiliation: College of Pharmacy, Chungbuk National University, 48 Gaesin-dong, Heungduk-gu, Cheongju, Chungbuk 361-763, Republic of Korea.
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Lee
authors.forename: Tae Youl
authors.initials: TY
authors.lastname: Ha
authors.forename: Dong Ju
authors.initials: DJ
authors.lastname: Son
authors.forename: Sung Ran
authors.initials: SR
authors.lastname: Kim
authors.forename: Jin Tae
authors.initials: JT
authors.lastname: Hong
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D016229:Amyloid beta-Peptides / Q000633:toxicity*; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D015153:Blotting, Western / Q000379:methods; D002118:Calcium / Q000378:metabolism; D053148:Caspase 3; D020169:Caspases / Q000378:metabolism; D016923:Cell Death / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D003849:Deoxyguanosine / Q000031:analogs & derivatives / Q000378:metabolism; D004149:Dioxoles / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004347:Drug Interactions; D024202:Electrophoretic Mobility Shift Assay / Q000379:methods; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005663:Furans / Q000494:pharmacology*; D005960:Glucosides / Q000494:pharmacology; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D007211:Indoles; D007501:Iron / Q000494:pharmacology; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism; D016328:NF-kappa B / Q000378:metabolism; D016716:PC12 Cells / Q000166:cytology / Q000187:drug effects*; D010446:Peptide Fragments / Q000633:toxicity*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D017382:Reactive Oxygen Species / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D013440:Sulfides / Q000494:pharmacology; D013778:Tetrazolium Salts; D013844:Thiazoles; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D051028:bcl-2-Associated X Protein
chemical_list: D016229:Amyloid beta-Peptides; D000975:Antioxidants; C494826:BAX protein, human; C494828:Bax protein, rat; D004149:Dioxoles; D005663:Furans; D005960:Glucosides; D007211:Indoles; D016328:NF-kappa B; D010446:Peptide Fragments; D019253:Proto-Oncogene Proteins c-bcl-2; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D013440:Sulfides; D013778:Tetrazolium Salts; D013844:Thiazoles; D016159:Tumor Suppressor Protein p53; C075222:amyloid beta-protein (1-42); C074636:amyloid beta-protein (25-35); D051028:bcl-2-Associated X Protein; C011342:pyrite; C007293:DAPI; C066016:sesaminol; D000080242:8-Hydroxy-2'-Deoxyguanosine; D006861:Hydrogen Peroxide; D007501:Iron; D020928:Mitogen-Activated Protein Kinases; C505407:CASP3 protein, human; C505410:Casp3 protein, rat; D053148:Caspase 3; D020169:Caspases; C022616:thiazolyl blue; D003849:Deoxyguanosine; D002118:Calcium