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Luminescence Resonance Energy Transfer to Study Conformational Changes in Membrane Proteins Expressed in Mammalian Cells
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A two-photon europium complex as specific endoplasmic reticulum probe.

Ga-Lai Law1, Ka-Leung Wong, Cornelia Wing-Yin Man

  • 1Department of Chemistry, The University of Hong Kong, Pokfulam, Hong Kong.

Journal of Biophotonics
|August 18, 2009
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New europium complexes offer advantages for endoplasmic reticulum imaging, including fast uptake and low cytotoxicity. These highly emissive compounds enable precise two-photon imaging with f-f emission.

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Area of Science:

  • Inorganic Chemistry
  • Biomedical Imaging
  • Materials Science

Background:

  • Europium complexes are explored for luminescent applications.
  • Targeting specific organelles like the endoplasmic reticulum is crucial for advanced cellular imaging.
  • Developing probes with enhanced photophysical properties and low toxicity is an ongoing challenge.

Purpose of the Study:

  • To synthesize and characterize highly emissive europium complexes.
  • To evaluate their potential for endoplasmic reticulum localization.
  • To demonstrate their utility in two-photon induced f-f emission imaging.

Main Methods:

  • Synthesis of novel europium complexes.
  • Cellular uptake and localization studies using fluorescence microscopy.
  • Two-photon excitation spectroscopy for emission imaging.
  • Cytotoxicity assays.

Main Results:

  • The synthesized europium complexes exhibit high luminescence.
  • These complexes show specific localization within the endoplasmic reticulum.
  • Fast cellular uptake and long resident lifetimes were observed.
  • Low cytotoxicity was confirmed at required dosages.
  • Effective two-photon induced f-f emission imaging was achieved.

Conclusions:

  • Highly emissive europium complexes with endoplasmic reticulum targeting capabilities have been developed.
  • These complexes present a promising platform for advanced cellular imaging due to their favorable properties.
  • The findings support the use of these complexes in biological and biomedical research.