Genetically Controlled Lysosomal Entrapment of Superparamagnetic Ferritin for Multimodal and Multiscale Imaging and Actuation with Low Tissue Attenuation. (13th March 2018)

• Record Type: Journal Article
• Authors: Massner, Christoph; Sigmund, Felix; Pettinger, Susanne; Seeger, Markus; Hartmann, Carolin; Ivleva, Natalia P.; Niessner, Reinhard; Fuchs, Helmut; de Angelis, Martin Hrabě; Stelzl, Anja; Koonakampully, Neha Lal; Rolbieski, Hannes; Wiedwald, Ulf; Spasova, Marina; Wurst, Wolfgang; Ntziachristos, Vasilis; Winklhofer, Michael; Westmeyer, Gil G.
• Is Part Of: Advanced functional materials. Volume 28:Number 19(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-03-13
• Subjects: magnetic hyperthermia -- magnetic resonance imaging (MRI) -- magnetoferritin -- optoacoustic imaging -- third‐harmonic generation (THG); Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201706793
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Nanomaterials are of enormous value for biomedical applications because of their customizable features. However, the material properties of nanomaterials can be altered substantially by interactions with tissue thus making it important to assess them in the specific biological context to understand and tailor their effects. Here, a genetically controlled system is optimized for cellular uptake of superparamagnetic ferritin and subsequent trafficking to lysosomes. High local concentrations of photoabsorbing magnetoferritin give robust contrast in optoacoustic imaging and allow for selective photoablation of cells overexpressing ferritin receptors. Genetically controlled uptake of the biomagnetic nanoparticles also strongly enhances third‐harmonic generation due to the change of refractive index caused by the magnetite–protein interface of ferritins entrapped in lysosomes. Selective uptake of magnetoferritin furthermore enables sensitive detection of receptor‐expressing cells by magnetic resonance imaging, as well as efficient magnetic cell sorting and manipulation. Surprisingly, a substantial increase in the blocking temperature of lysosomally entrapped magnetoferritin is observed, which allows for specific ablation of genetically defined cell populations by local magnetic hyperthermia. The subcellular confinement of superparamagnetic ferritins thus enhances their physical properties to empower genetically controlled interrogation of cellular processes with deep tissue penetration. Abstract : Genetically controlled cellular uptake and lysosomal confinement of superparamagnetic ferritins (magnetoferritins) enable interrogation of cellular processes with deep tissue penetration via optoacoustic imaging, third harmonic generation microscopy, photoablation, as well as magnetic resonance imaging and magnetic cell sorting and manipulation. A substantial increase of the blocking temperature of lysosomal magnetoferritins furthermore allows for ablation of genetically defined cells by local magnetic hyperthermia.