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The role of iron redox state in the genotoxicity of ultrafine superparamagnetic iron oxide nanoparticles |
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| Authors: | Singh Neenu Jenkins Gareth J S Nelson Bryant C Marquis Bryce J Maffeis Thierry G G Brown Andy P Williams Paul M Wright Chris J Doak Shareen H |
| Affiliation: | a Institute of Life Science, College of Medicine, Swansea University, Singleton Park, Swansea SA2 8PP, Wales, UK b National Institute of Standards and Technology (NIST), Material Measurement Laboratory - Biochemical Science Division, 100 Bureau Drive, Gaithersburg, MD 20899, USA c Multi-disciplinary Nanotechnology Centre, College of Engineering, Swansea University, Singleton Park, Swansea SA2 8PP, Wales, UK d Institute for Materials Research, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK |
| Abstract: | Ultrafine superparamagnetic iron oxide nanoparticles (USPION) hold great potential for revolutionising biomedical applications such as MRI, localised hyperthermia, and targeted drug delivery. Though evidence is increasing regarding the influence of nanoparticle physico-chemical features on toxicity, data however, is lacking that assesses a range of such characteristics in parallel. We show that iron redox state, a subtle though important physico-chemical feature of USPION, dramatically modifies the cellular uptake of these nanoparticles and influences their induction of DNA damage. Surface chemistry was also found to have an impact and evidence to support a potential mechanism of oxidative DNA damage behind the observed responses has been demonstrated. As human exposure to ferrofluids is predicted to increase through nanomedicine based therapeutics, these findings are important in guiding the fabrication of USPION to ensure they have characteristics that support biocompatibility. |
| Keywords: | Genotoxicity Iron oxide nanoparticles Oxidation Biocompatibility Metal ion release |
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