title: Preparation of gelatin nanospheres incorporating quantum dots and iron oxide nanoparticles for multimodal cell imaging.
abstract: The objective of this study is to prepare a multimodal probe which can simultaneously visualize cells by optical and magnetic resonance (MR) imaging modalities. Gelatin nanospheres incorporating quantum dots (QD) and iron oxide nanoparticles (IONP) were prepared by the conventional emulsion method. The percentage of QD and IONP incorporated in gelatin nanospheres was changed by the concentrations of gelatin and glutaraldehyde used. However, the apparent size and surface zeta potential were hardly changed. Gelatin nanospheres incorporating QD and IONP were treated with octa-arginine (R8) of a cell-penetrating peptide. When incubated with normal human articular chondrocytes, gelatin nanospheres incorporating QD and IONP were efficiently internalized into the cells although their cytotoxicity was observed at the R8 concentration of 320 μM. The cells internalizing gelatin nanospheres incorporating QD and IONP could be visualized by both the optical and MR imaging modalities. It is concluded that gelatin nanospheres incorporating QD and IONP are promising for the probe of multimodal cell imaging.
authors.affiliation: a Laboratory of Biomaterials, Department of Regeneration Science and Engineering , Institute for Frontier Life and Medical Sciences, Kyoto University , Kyoto , Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Murata
authors.affiliation: a Laboratory of Biomaterials, Department of Regeneration Science and Engineering , Institute for Frontier Life and Medical Sciences, Kyoto University , Kyoto , Japan.
authors.forename: Jun-Ichiro
authors.initials: JI
authors.lastname: Jo
authors.affiliation: a Laboratory of Biomaterials, Department of Regeneration Science and Engineering , Institute for Frontier Life and Medical Sciences, Kyoto University , Kyoto , Japan.
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Tabata
mesh_terms: D002358:Cartilage, Articular / Q000166:cytology; D002470:Cell Survival; D019902:Chondrocytes; D005290:Ferric Compounds / Q000737:chemistry*; D005780:Gelatin / Q000737:chemistry*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D064847:Multimodal Imaging / Q000379:methods*; D054118:Nanospheres / Q000737:chemistry*; D061848:Optical Imaging / Q000379:methods; D010316:Particle Size; D045663:Quantum Dots / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005290:Ferric Compounds; C000499:ferric oxide; D005780:Gelatin
keywords: Quantum dots; R8; iron oxide nanoparticles; nanosphere