title: Influence of naturally occurring antioxidants on magnetic nanoparticles: risks, benefits, and possible therapeutic applications.
abstract: We have studied interaction of well known antioxidant L-ascorbic acid with magnetic nanoparticles containing insoluble Fe(III) in their core. In analogy with ferritin, mobilization of iron in the form of water soluble Fe(II) was observed, especially pronounced at higher temperatures. In the presence of hydrogen peroxide cytotoxic hydroxyl radicals are produced. These results suggest possible harmful effects of widely used magnetic nanoparticles as a MRI contrast agents in combination with overload of organism with ascorbic acid in some specific conditions, like fever of patient. On the other hand combination of magnetic nanoparticles and ascorbic acid may be used for a cancer therapy using alternating magnetic field for the release of Fe(II) via Néel relaxation of magnetic moment of used nanoparticles. We have further found that lipoic acid is an efficient antioxidant scavenging hydroxyl radicals produced by Fenton reaction from Fe(II).
authors.affiliation: St. Elizabeth Cancer Institute, Bratislava, Slovak Republic.
authors.forename: Stefan
authors.initials: S
authors.lastname: Durdík
authors.forename: Hanka
authors.initials: H
authors.lastname: Vrbovská
authors.forename: Adam
authors.initials: A
authors.lastname: Olas
authors.forename: Melánia
authors.initials: M
authors.lastname: Babincová
mesh_terms: D000975:Antioxidants / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D001205:Ascorbic Acid / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D004574:Electromagnetic Fields; D058185:Magnetite Nanoparticles / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects / Q000627:therapeutic use; D011829:Radiation Dosage; D013696:Temperature
chemical_list: D000975:Antioxidants; D058185:Magnetite Nanoparticles; D001205:Ascorbic Acid