title: Inhibitory effects of a manganese superoxide dismutase isolated from garlic (Allium sativum L.) on in vitro tumoral cell growth.
abstract: Reactive oxygen species are implicated in cancer development and antioxidants in general and superoxide dismutases and superoxide dismutase mimetic in particular, and they inhibit malignant transformation. We examinated the effects of an isolated manganese superoxide dismutase from a medicinal plant Allium sativum. The protein was prepared by a serial of chromatographic techniques: gel filtration and diethylaminoethyl ions exchanger. The enzyme has a specific activity equal to 55 U/mg. Two tumoral cell lines, porcine endothelial cells and mouse melanoma cells were exposed to garlic superoxide dismutase. The exogenous manganese superoxide dismutase is able to modify the intracellular level of reactive oxygen species by eliminating superoxide anion and producing hydrogen peroxide. The cell viability of the two lines was not significantly affected but the cell multiplication was arrested. This effect obtained in the presence of manganese superoxide dismutase correlates with the activation and modulation of phospho-extracellular signal-regulated kinases proteins, implicated in the control of several biological processes including cell proliferation.
authors.affiliation: Department of Bioengineering, National Institute of Applied Sciences and Technology, Tunis, Tunisia.
authors.forename: Imen Hadji
authors.initials: IH
authors.lastname: Sfaxi
authors.forename: Daniela
authors.initials: D
authors.lastname: Ferraro
authors.forename: Elena
authors.initials: E
authors.lastname: Fasano
authors.forename: Giovambattista
authors.initials: G
authors.lastname: Pani
authors.forename: Ferid
authors.initials: F
authors.lastname: Limam
authors.forename: M Nejib
authors.initials: MN
authors.lastname: Marzouki
mesh_terms: D000818:Animals; D015153:Blotting, Western; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D005737:Garlic / Q000201:enzymology*; D006861:Hydrogen Peroxide / Q000378:metabolism; D051379:Mice; D009369:Neoplasms / Q000188:drug therapy*; D017382:Reactive Oxygen Species / Q000378:metabolism; D013482:Superoxide Dismutase / Q000302:isolation & purification / Q000494:pharmacology*; D013481:Superoxides / Q000378:metabolism
chemical_list: D017382:Reactive Oxygen Species; D013481:Superoxides; D006861:Hydrogen Peroxide; D013482:Superoxide Dismutase