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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Optical Imaging

Background:

  • Sentinel lymph nodes (SLNs) are critical for cancer metastasis detection.
  • Effective imaging techniques are needed to identify SLNs accurately.
  • Activatable nanoparticles offer potential for targeted imaging.

Purpose of the Study:

  • To design and evaluate fluorophore-quencher-based activatable nanoparticles for SLN imaging.
  • To investigate the properties and in vivo performance of these nanoparticles.
  • To assess their utility in detecting metastatic cancer in SLNs.

Main Methods:

  • Constructed ternary anionic complexes using G4 dendrimers, PEI, and γ-PGA.
  • Incorporated TAMRA fluorophore and BHQ2 or QSY7 quenchers.
  • Utilized electrostatic self-assembly for nanoparticle formation.
  • Performed in vitro fluorescence microscopy and in vivo optical imaging in mice.

Main Results:

  • Synthesized nanoparticles (approx. 40 nm, ζ-potential -50 mV) exhibiting FRET quenching.
  • TAMRA-G4-DTPA/PEI-QSY7/γ-PGA complex showed lysosomal localization and intracellular fluorescence.
  • Successfully detected mouse popliteal lymph nodes using in vivo imaging.

Conclusions:

  • Fluorophore-quencher conjugated nanoparticles based on FRET quenching are effective for SLN imaging.
  • This approach shows promise for fluorescence-based optical imaging of SLNs.
  • The developed nanoparticles could aid in early cancer metastasis detection.