INTRODUCTION: The inherent fluorescence properties of iron oxide nanoparticles (IONPs) were characterized, and their applicability for multiphoton imaging in cells was tested in combination with their magnetic resonance imaging (MRI) capabilities. METHODS: Superparamagnetic iron oxide nanoparticles were synthesized and subsequently coated with polyethylene glycol to make them water-dispersible. Further characterization of the particles was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic light scattering (DLS), superconducting quantum interference device (SQUID) and magnetic resonance relaxivity measurements. MRI and fluorescence properties of bare IONPs were first studied in solution and subsequently in A549-labeled cells. RESULTS: The particles, with a core size of 11.3 ± 4.5 nm, showed a good negative MRI contrast in tissue-mimicking phantoms. In vitro studies in mammalian A549 cells demonstrate that these IONPs are biocompatible and can also produce significant T2/T2* contrast enhancement in IONPs-labeled cells. Furthermore, excitation-wavelength dependent photoluminescence was observed under one- and two-photon excitation. DISCUSSION: The obtained results indicated that IONPs could be used for fluorescence label-free bioimaging at multiple wavelengths, which was proven by multiphoton imaging of IONPs internalization in A549 cancer cells.
INTRODUCTION: The inherent fluorescence properties of iron oxide nanoparticles (IONPs) were characterized, and their applicability for multiphoton imaging in cells was tested in combination with their magnetic resonance imaging (MRI) capabilities. METHODS: Superparamagnetic iron oxide nanoparticles were synthesized and subsequently coated with polyethylene glycol to make them water-dispersible. Further characterization of the particles was performed using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), dynamic light scattering (DLS), superconducting quantum interference device (SQUID) and magnetic resonance relaxivity measurements. MRI and fluorescence properties of bare IONPs were first studied in solution and subsequently in A549-labeled cells. RESULTS: The particles, with a core size of 11.3 ± 4.5 nm, showed a good negative MRI contrast in tissue-mimicking phantoms. In vitro studies in mammalian A549 cells demonstrate that these IONPs are biocompatible and can also produce significant T2/T2* contrast enhancement in IONPs-labeled cells. Furthermore, excitation-wavelength dependent photoluminescence was observed under one- and two-photon excitation. DISCUSSION: The obtained results indicated that IONPs could be used for fluorescence label-free bioimaging at multiple wavelengths, which was proven by multiphoton imaging of IONPs internalization in A549 cancer cells.
Authors: Sofia Zanin; Simone Molinari; Giorgio Cozza; Massimiliano Magro; Giorgio Fedele; Fabio Vianello; Andrea Venerando Journal: Int J Biol Macromol Date: 2020-09-30 Impact factor: 6.953
Authors: Stefaan J Soenen; Bella B Manshian; Tangi Aubert; Uwe Himmelreich; Jo Demeester; Stefaan C De Smedt; Zeger Hens; Kevin Braeckmans Journal: Chem Res Toxicol Date: 2014-06-04 Impact factor: 3.739
Authors: Roxanne Hachani; Martin A Birchall; Mark W Lowdell; Georgios Kasparis; Le D Tung; Bella B Manshian; Stefaan J Soenen; Willy Gsell; Uwe Himmelreich; Codi A Gharagouzloo; Srinivas Sridhar; Nguyen T K Thanh Journal: Sci Rep Date: 2017-08-10 Impact factor: 4.379