title: Suppression of p53-activated gene, PAG608, attenuates methamphetamine-induced neurotoxicity.
abstract: The p53-activated gene 608 (PAG608) is a proapoptotic gene activated and regulated by p53 expression in oxidative stress-induced apoptosis of neuronal cells. In this study, we determined the role of PAG608 in methamphetamine-induced neurotoxicity. Treatment of mouse dopaminergic CATH.a cells with 2 mM methamphetamine increased PAG608 expression at 3h followed by increase in phosphorylated p53 expression. Transient transfection of PAG608 antisense cDNA or RNA interference using PAG608 small interfering RNA significantly attenuated the dose-dependent decrease in cell viability of CATH.a cells by methamphetamine (1-4 mM) exposure. In monoaminergic neuronal B65 cells, which contain serotonin rather than dopamine, methamphetamine-induced cell death was also significantly but partially protected by transient transfection of PAG608 antisense cDNA. Furthermore, cell death of PC12 cells produced by methamphetamine (1-5 mM) was almost completely prevented by stable expression of PAG608 antisense cDNA, compared with significant reduction of cell viability in control PC12 cells. Our results showed that suppression of PAG608 using transient and stable transfection with PAG608 antisense cDNA or small interfering RNA attenuates methamphetamine-induced death of various monoaminergic neuronal cells, suggesting that methamphetamine neurotoxicity in monoaminergic cells is related, at least in part, to induction of PAG608 expression.
authors.affiliation: Department of Brain Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikatacho, Okayama 700-8558, Japan. asachan@cc.okayama-u.ac.jp
authors.forename: Masato
authors.initials: M
authors.lastname: Asanuma
authors.forename: Ikuko
authors.initials: I
authors.lastname: Miyazaki
authors.forename: Youichirou
authors.initials: Y
authors.lastname: Higashi
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Diaz-Corrales
authors.forename: Masako
authors.initials: M
authors.lastname: Shimizu
authors.forename: Ko
authors.initials: K
authors.lastname: Miyoshi
authors.forename: Norio
authors.initials: N
authors.lastname: Ogawa
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000235:genetics; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000235:genetics; D000697:Central Nervous System Stimulants / Q000633:toxicity; D004268:DNA-Binding Proteins / Q000235:genetics*; D004298:Dopamine / Q000378:metabolism; D015536:Down-Regulation / Q000235:genetics; D004351:Drug Resistance / Q000235:genetics*; D005786:Gene Expression Regulation / Q000187:drug effects / Q000235:genetics; D008694:Methamphetamine / Q000633:toxicity*; D051379:Mice; D009410:Nerve Degeneration / Q000235:genetics / Q000378:metabolism / Q000503:physiopathology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D009498:Neurotoxins / Q000633:toxicity*; D009687:Nuclear Proteins / Q000235:genetics*; D016716:PC12 Cells; D034622:RNA Interference / Q000502:physiology*; D034741:RNA, Small Interfering / Q000494:pharmacology; D016601:RNA-Binding Proteins; D051381:Rats; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*
chemical_list: D000697:Central Nervous System Stimulants; D004268:DNA-Binding Proteins; D009498:Neurotoxins; D009687:Nuclear Proteins; D034741:RNA, Small Interfering; D016601:RNA-Binding Proteins; D016159:Tumor Suppressor Protein p53; C107469:Zmat3 protein, rat; D008694:Methamphetamine; D004298:Dopamine