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Bacterial imaging with photostable upconversion fluorescent nanoparticles

Authors
Journal
Biomaterials
0142-9612
Publisher
Elsevier
Volume
35
Issue
9
Identifiers
DOI: 10.1016/j.biomaterials.2013.12.060
Keywords
  • Bacteria Labeling
  • Upconversion Nanoparticles
  • Fluorescence Imaging
  • Escherichia Coli
Disciplines
  • Biology
  • Physics

Abstract

Abstract Autofluorescence, photodamage and photobleaching are often encountered when using downconverting fluorophores and fluorescent proteins for bacteria labeling. These caveats represent a serious limitation when trying to map bacteria dissemination for prolonged periods. Upconversion nanoparticles (UCNs), which are able to convert low energy near-infrared (NIR) excitation light into higher energy visible or NIR light, can address these limitations. These particles' unique optical properties translate into attractive advantages of minimal autofluorescence, reduced photodamage, deeper tissue penetration and prolonged photostability. Here, we report a UCN-based bacteria labeling strategy using Escherichia coli as prototypic bacteria. A comparative analysis highlighted the superior photostability of UCN-labeled bacteria over green fluorescent protein-expressing bacteria. Infection study of UCN-labeled bacteria in dendritic cells indicated co-localization of the UCN signal with bacterial position for up to 6 h post-infection. Furthermore, long-term monitoring of the same infected cells demonstrated the potential to utilize photostable UCN-based imaging for bacterial trafficking purposes.

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