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Multifunctional silica nanoparticles for optical and magnetic resonance imaging
-
Rajendra Joshi
,
Verena Feldmann
Published/Copyright:
December 4, 2012
Abstract
The surface of spherical, nonporous silica nanoparticles (SiO2-NPs) was modified with gadolinium (Gd) complexes, fluorophores, and cell-penetrating peptides to achieve multifunctionality on a single particle. The Gd surface concentrations were 9–16 μmol/g resulting in nanomaterials with high local longitudinal and transversal relaxivities (~1×105 and ~5×105 /mm/s/NP, respectively). Rapid cellular uptake was observed in vitro; however, larger extracellular agglomerates were also formed. In vivo administration revealed a fast distribution throughout the body followed by a nearly complete disappearance of fluorescence in all organs except the lungs, liver, and spleen after 24 h. Such NPs have the potential to serve as efficient multimodal probes in molecular imaging.
Keywords: contrast agents; fluorescence imaging; magnetic resonance imaging; octaarginine; SiO2 nanoparticles; surface modification
Received: 2012-7-12
Accepted: 2012-8-9
Published Online: 2012-12-04
Published in Print: 2013-01-01
©2012 by Walter de Gruyter Berlin Boston
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Keywords for this article
contrast agents;
fluorescence imaging;
magnetic resonance imaging;
octaarginine;
SiO2 nanoparticles;
surface modification
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- Masthead
- Masthead
- Reviews
- Exosomes: the ideal nanovectors for biodelivery
- Biological applications of the electrochemical sensing of nitric oxide: fundamentals and recent developments
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- Diversity, abundance, and sex-specific expression of chemosensory proteins in the reproductive organs of the locust Locusta migratoria manilensis
- Structure of the Ca2+-saturated C-terminal domain of scallop troponin C in complex with a troponin I fragment
- An acetylation site in lectin domain modulates the biological activity of polypeptide GalNAc-transferase-2
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- New insight into the molecular switch mechanism of human Rho family proteins: shifting a paradigm
- Cell Biology and Signaling
- HbG200-mediated preinduction of heme oxygenase-1 improves bile flow and ameliorates pericentral downregulation of Bsep and Mrp2 following experimental liver ischemia and reperfusion
- Effect of silver nanoparticles on human primary keratinocytes
- Multifunctional silica nanoparticles for optical and magnetic resonance imaging
- Proteolysis
- Activation profiles of human kallikrein-related peptidases by matrix metalloproteinases
