title: Proteomic analysis of apoptosis induced by xanthoangelol, a major constituent of Angelica keiskei, in neuroblastoma.
abstract: Neuroblastoma is the most common solid tumor in children. Despite aggressive chemotherapy, the prognosis of patients with advanced neuroblastoma is still very poor. Our recent study showed that xanthoangelol, a major chalcone constituent of the stem exudates of Angelica keiskei, induced caspase-3-dependent apoptosis in neuroblastoma cells. However, details of the mechanism underlying its apoptotic action are still unclear. Here we show that xanthoangelol triggers oxidative stress by generation of reactive oxygen species and induces apoptosis through release of cytochrome c and activation of caspase-9 in IMR-32 cells. Pretreatment with an antioxidant, vitamin E, prevented the increase of reactive oxygen species and apoptosis induced by xanthoangelol. Proteomic analysis using 2-dimensional electrophoresis and MALDI-TOF-MS revealed that DJ-1 protein was involved in xanthoangelol-induced apoptosis. DJ-1 responded to its oxidative stress status by being oxidized itself. Furthermore, DJ-1 was down-regulated by xanthoangelol, leading to loss of antioxidant function and acceleration of apoptosis. We also show that xanthoangelol has a cytotoxic effect on drug-resistant LA-N-1 and NB-39 cells as well as drug-sensitive IMR-32 and SK-N-SH cells. These findings suggest that xanthoangelol induces apoptosis by increasing reactive oxygen species and targeting DJ-1, and such mechanism may be an effective therapeutic approach for advanced neuroblastoma.
authors: Research Unit of Clinical Medicine, College of Pharmacy, Nihon University, 7-7-1 Narashinodai, Funabashi, Chiba 274-8555, Japan.
authors: Kou
authors: K
authors: Motani
authors: Keiichi
authors: K
authors: Tabata
authors: Yumiko
authors: Y
authors: Kimura
authors: Soichiro
authors: S
authors: Okano
authors: Yasuko
authors: Y
authors: Shibata
authors: Yoshimitsu
authors: Y
authors: Abiko
authors: Hisashi
authors: H
authors: Nagai
authors: Toshihiro
authors: T
authors: Akihisa
authors: Takashi
authors: T
authors: Suzuki
mesh_terms: D029969:Angelica / Q000737:chemistry*; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D001562:Benzimidazoles; D015153:Blotting, Western; D001932:Brain Neoplasms / Q000188:drug therapy* / Q000473:pathology; D045744:Cell Line, Tumor; D002599:Chalcone / Q000031:analogs & derivatives* / Q000494:pharmacology; D015536:Down-Regulation / Q000187:drug effects; D019008:Drug Resistance, Neoplasm; D015180:Electrophoresis, Gel, Two-Dimensional; D005456:Fluorescent Dyes; D006801:Humans; D009363:Neoplasm Proteins / Q000096:biosynthesis / Q000235:genetics; D009447:Neuroblastoma / Q000188:drug therapy* / Q000473:pathology; D018547:Plant Stems / Q000737:chemistry; D040901:Proteomics; D034741:RNA, Small Interfering / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013347:Subcellular Fractions / Q000378:metabolism; D013778:Tetrazolium Salts; D013844:Thiazoles
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D001562:Benzimidazoles; D005456:Fluorescent Dyes; D009363:Neoplasm Proteins; D034741:RNA, Small Interfering; D017382:Reactive Oxygen Species; D013778:Tetrazolium Salts; D013844:Thiazoles; D002599:Chalcone; C068244:xanthoangelol; C022616:thiazolyl blue; C017807:bisbenzimide ethoxide trihydrochloride