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In Vivo Imaging of Quantum Dots Encapsulated in Phospholipid Micelles

Science  29 Nov 2002:
Vol. 298, Issue 5599, pp. 1759-1762
DOI: 10.1126/science.1077194

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Abstract

Fluorescent semiconductor nanocrystals (quantum dots) have the potential to revolutionize biological imaging, but their use has been limited by difficulties in obtaining nanocrystals that are biocompatible. To address this problem, we encapsulated individual nanocrystals in phospholipid block–copolymer micelles and demonstrated both in vitro and in vivo imaging. When conjugated to DNA, the nanocrystal-micelles acted as in vitro fluorescent probes to hybridize to specific complementary sequences. Moreover, when injected into Xenopus embryos, the nanocrystal-micelles were stable, nontoxic (<5 × 109 nanocrystals per cell), cell autonomous, and slow to photobleach. Nanocrystal fluorescence could be followed to the tadpole stage, allowing lineage-tracing experiments in embryogenesis.

  • * To whom correspondence should be addressed. E-mail: benoit.dubertret{at}espci.fr, dnorris{at}umn.edu

  • Present address: UPRA0005, CNRS and ESPCI, Laboratoire d'Optique Physique, 10 rue Vauquelin, 75005 Paris, France.

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