In vivo excitation of nanoparticles using luminescent bacteria - Institut Pasteur
Journal Articles Proceedings of the National Academy of Sciences of the United States of America Year : 2012

In vivo excitation of nanoparticles using luminescent bacteria

Joe Dragavon
  • Function : Correspondent author
Samantha Blazquez
  • Function : Author
Abdessalem Rekiki
  • Function : Author
  • PersonId : 1425494
  • IdHAL : arekiki
Ioanna Theodorou
Régis R. Tournebize
  • Function : Author
  • PersonId : 944774
Spencer Shorte
  • Function : Correspondent author

Abstract

The lux operon derived from Photorhabdus luminescens incorporated into bacterial genomes, elicits the production of biological chemiluminescence typically centered on 490 nm. The light-producing bacteria are widely used for in vivo bioluminescence imaging. However, in living samples, a common difficulty is the presence of blue-green absorbers such as hemoglobin. Here we report a characterization of fluorescence by unbound excitation from luminescence, a phenomenon that exploits radiating luminescence to excite nearby fluorophores by epifluorescence. We show that photons from bioluminescent bacteria radiate over mesoscopic distances and induce a red-shifted fluorescent emission from appropriate fluorophores in a manner distinct from bioluminescence resonance energy transfer. Our results characterizing fluorescence by unbound excitation from luminescence, both in vitro and in vivo, demonstrate how the resulting blue-to-red wavelength shift is both necessary and sufficient to yield contrast enhancement revealing mesoscopic proximity of luminescent and fluorescent probes in the context of living biological tissues.
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Dates and versions

hal-04731174 , version 1 (10-10-2024)

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Joe Dragavon, Samantha Blazquez, Abdessalem Rekiki, Chelsea Samson, Ioanna Theodorou, et al.. In vivo excitation of nanoparticles using luminescent bacteria. Proceedings of the National Academy of Sciences of the United States of America, 2012, 109 (23), pp.8890-8895. ⟨10.1073/pnas.1204516109⟩. ⟨hal-04731174⟩

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