title: Diclofenac-induced apoptosis in the neuroblastoma cell line SH-SY5Y: possible involvement of the mitochondrial superoxide dismutase.
abstract: Diclofenac, a nonsteroidal anti-inflammatory drug, induces apoptosis on the neuroblastoma cell line SH-SY5Y through a mitochondrial dysfunction, affecting some antioxidant mechanisms. Indeed, the time- and dose-dependent increase of apoptosis is associated to an early enhancement of the reactive oxygen species (ROS). Mitochondrial superoxide dismutase (SOD2) plays a crucial role in the defence against ROS, thus protecting against several apoptotic stimuli. Diclofenac decreased the protein levels and the enzymatic activity of SOD2, without any significant impairment of the corresponding mRNA levels in the SH-SY5Y extracts. When cells were incubated with an archaeal exogenous thioredoxin, an attenuation of the diclofenac-induced apoptosis was observed, together with an increase of SOD2 protein levels. Furthermore, diclofenac impaired the mitochondrial membrane potential, leading to a release of cytochrome c. These data suggest that mitochondria are involved in the diclofenac-induced apoptosis of SH-SY5Y cells and point to a possible role of SOD2 in this process.
authors.affiliation: Dipartimento di Biochimica e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Via S. Pansini 5, Napoli, Italy.
authors.forename: Francesca
authors.initials: F
authors.lastname: Cecere
authors.forename: Annarita
authors.initials: A
authors.lastname: Iuliano
authors.forename: Francesco
authors.initials: F
authors.lastname: Albano
authors.forename: Claudia
authors.initials: C
authors.lastname: Zappelli
authors.forename: Immacolata
authors.initials: I
authors.lastname: Castellano
authors.forename: Pasquale
authors.initials: P
authors.lastname: Grimaldi
authors.forename: Mariorosario
authors.initials: M
authors.lastname: Masullo
authors.forename: Emmanuele
authors.initials: E
authors.lastname: De Vendittis
authors.forename: Maria Rosaria
authors.initials: MR
authors.lastname: Ruocco
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D017209:Apoptosis / Q000187:drug effects*; D045744:Cell Line, Tumor; D045304:Cytochromes c / Q000378:metabolism; D004008:Diclofenac / Q000494:pharmacology*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D042541:Intracellular Space / Q000187:drug effects / Q000378:metabolism; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D008928:Mitochondria / Q000187:drug effects* / Q000201:enzymology*; D009447:Neuroblastoma / Q000201:enzymology / Q000235:genetics / Q000473:pathology*; D021381:Protein Transport / Q000187:drug effects; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013347:Subcellular Fractions / Q000187:drug effects / Q000378:metabolism; D013482:Superoxide Dismutase / Q000235:genetics / Q000378:metabolism*; D013879:Thioredoxins / Q000494:pharmacology; D000099156:Superoxide Dismutase 2
chemical_list: D000975:Antioxidants; D045304:Cytochromes c; D004008:Diclofenac; D012333:RNA, Messenger; D017382:Reactive Oxygen Species; D013482:Superoxide Dismutase; D013879:Thioredoxins; D000099156:Superoxide Dismutase 2