title: Protective effects of Chinese propolis and its component, chrysin, against neuronal cell death via inhibition of mitochondrial apoptosis pathway in SH-SY5Y cells.
abstract: Endoplasmic reticulum (ER) stress has been implicated in the pathogenesis of neurodegenerative and ischemic disorders. The purpose of this study was to evaluate the effects of Chinese propolis and its constituents [chrysin, galangin, pinocembrin, caffeic acid, and caffeic acid phenethyl ester (CAPE)] against tunicamycin-induced neuronal cell death in SH-SY5Y cells. Both Chinese propolis and chrysin concentration-dependently inhibited such cell death, the tunicamycin-induced activation of caspase-3, and the effects of tunicamycin on mitochondria [release of cytochrome c into the cytosol and disruption of the mitochondrial membrane potential (DeltaPsim)]. Furthermore, Chinese propolis and chrysin each inhibited staurosporine-induced cell death. These findings indicate that the inhibitory effects of Chinese propolis against neuronal cell death induced by ER stress or staurosporine may be exerted primarily by chrysin. Moreover, the mechanism underlying the protective effects may, at least partly, involve inhibitions of caspase-3 activity and the mitochondrial apoptotic pathway.
authors.affiliation: Department of Biofunctional Evaluation, Molecular Pharmacology, Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Izuta
authors.forename: Masamitsu
authors.initials: M
authors.lastname: Shimazawa
authors.forename: Shigemi
authors.initials: S
authors.lastname: Tazawa
authors.forename: Yoko
authors.initials: Y
authors.lastname: Araki
authors.forename: Satoshi
authors.initials: S
authors.lastname: Mishima
authors.forename: Hideaki
authors.initials: H
authors.lastname: Hara
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D053148:Caspase 3 / Q000378:metabolism; D045744:Cell Line, Tumor; D004721:Endoplasmic Reticulum / Q000187:drug effects; D004789:Enzyme Activation / Q000187:drug effects; D005419:Flavonoids / Q000494:pharmacology*; D006801:Humans; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D008928:Mitochondria / Q000187:drug effects* / Q000502:physiology; D009447:Neuroblastoma; D009474:Neurons / Q000187:drug effects*; D011429:Propolis / Q000737:chemistry / Q000494:pharmacology*; D019311:Staurosporine / Q000494:pharmacology; D014415:Tunicamycin / Q000494:pharmacology
chemical_list: D005419:Flavonoids; D014415:Tunicamycin; C043561:chrysin; D011429:Propolis; D053148:Caspase 3; D019311:Staurosporine