title: Antioxidant activity of the organotellurium compound 3-[4-(N,N-dimethylamino)benzenetellurenyl]propanesulfonic acid against oxidative stress in synaptosomal membrane systems and neuronal cultures.
abstract: Antioxidant activities of 3-[4-(N,N-dimethylamino) benzenetellurenyl]propanesulfonic acid sodium salt (NDBT) were evaluated in solution, red blood cells, synaptosomal membranes, and cultured hippocampal neuronal cells after exposure to peroxynitrite (ONOO(-)) and hydroxyl radicals. The organotellurium compound NDBT possesses significant activity towards hydrogen peroxide and/or the hydroxyl radical in solution, demonstrated by inhibition of hydroxylation of terephthalic acid. In addition, the compound displayed great antioxidant abilities as shown by: reduction of ONOO(-)-induced 2,7-dichlorofluorescein (DCF) fluorescence in synaptosomes; complete prevention of lipid peroxidation in synaptosomes caused by OH radicals (TBARS), and significant prevention of protein oxidation caused by ONOO(-) and OH, indexed by the levels of protein carbonyls in synaptosomes and neuronal cells. The presence of the compound abolished neuronal cell death caused by ONOO(-). Further, the compound was effective in preventing the oxidative changes in synaptosomal membrane protein conformation and crosslinking (EPR spin labeling). Finally, the organotellurium molecule attenuated peroxynitrite-induced, luminol-dependent chemiluminescence in red blood cells--an index of cellular oxidation. These findings demonstrate the great potential of the antioxidant and are consistent with the notion that NDBT may have a role to play in modulating oxidative stress in neurodegenerative disorders, including Alzheimer's disease.
authors.affiliation: Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA.
authors.forename: J
authors.initials: J
authors.lastname: Kanski
authors.forename: J
authors.initials: J
authors.lastname: Drake
authors.forename: M
authors.initials: M
authors.lastname: Aksenova
authors.forename: L
authors.initials: L
authors.lastname: Engman
authors.forename: D A
authors.initials: DA
authors.lastname: Butterfield
mesh_terms: D017738:Alkanesulfonic Acids / Q000494:pharmacology*; D000818:Animals; D000975:Antioxidants / Q000494:pharmacology*; D016923:Cell Death / Q000187:drug effects* / Q000502:physiology; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D002470:Cell Survival / Q000187:drug effects / Q000502:physiology; D002478:Cells, Cultured / Q000187:drug effects / Q000378:metabolism; D016166:Free Radical Scavengers / Q000494:pharmacology; D005609:Free Radicals / Q000037:antagonists & inhibitors / Q000378:metabolism; D005849:Gerbillinae; D015227:Lipid Peroxidation / Q000187:drug effects; D008163:Luminescent Measurements; D009419:Nerve Tissue Proteins / Q000187:drug effects / Q000378:metabolism; D019636:Neurodegenerative Diseases / Q000188:drug therapy* / Q000378:metabolism / Q000503:physiopathology; D009474:Neurons / Q000187:drug effects / Q000378:metabolism; D018696:Neuroprotective Agents / Q000494:pharmacology*; D009566:Nitrates / Q000037:antagonists & inhibitors / Q000494:pharmacology; D009942:Organometallic Compounds / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects* / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D017382:Reactive Oxygen Species / Q000378:metabolism; D013574:Synaptosomes / Q000187:drug effects / Q000378:metabolism; D013691:Tellurium
chemical_list: C436285:3-(4-(N,N-dimethylamino)benzenetellurenyl)propanesulfonic acid; D017738:Alkanesulfonic Acids; D000975:Antioxidants; D016166:Free Radical Scavengers; D005609:Free Radicals; D009419:Nerve Tissue Proteins; D018696:Neuroprotective Agents; D009566:Nitrates; D009942:Organometallic Compounds; D017382:Reactive Oxygen Species; C039642:peroxynitric acid; C068559:propylsulfonic acid; D013691:Tellurium