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Related Experiment Video

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A macrophage-specific fluorescent probe for intraoperative lymph node staging.

Jung Sun Yoo1, Sung-Chan Lee, Zhi Yen Jow

  • 1Authors' Affiliations: Department of Chemistry and MedChem Program of Life Sciences Institute, National University of Singapore; and Laboratory of Bioimaging Probe Development, Singapore Bioimaging Consortium, Agency for Science, Technology and Research, Singapore.

Cancer Research
|December 11, 2013
PubMed
Summary

A novel macrophage-specific fluorescent probe (MFP) enables real-time visualization of lymph nodes during surgery. This imaging technology aids in differentiating cancerous metastases from inflammation, improving cancer staging and patient outcomes.

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Area of Science:

  • Biomedical Imaging
  • Molecular Imaging
  • Cancer Diagnostics

Background:

  • Accurate lymph node staging is critical for effective cancer treatment and improving patient survival.
  • Current intraoperative methods struggle to reliably distinguish between metastatic and inflamed lymph nodes.
  • Existing advanced imaging techniques like nanoparticle-enhanced MRI and quantum-dot fluorescence imaging have limitations for real-time nodal assessment.

Purpose of the Study:

  • To develop and validate a novel imaging approach for intraoperative assessment of lymph node status.
  • To demonstrate the feasibility of using a macrophage-specific fluorescent probe (MFP) for real-time lymph node visualization.
  • To establish a preclinical proof of concept for an imaging platform that differentiates metastatic from inflamed lymph nodes.

Main Methods:

  • High-throughput screening of fluorescent small-molecule libraries to identify a macrophage-specific fluorescent probe (MFP).
  • In vitro validation using live-cell imaging and flow cytometry to confirm selective visualization of monocyte and macrophage populations.
  • In vivo application of MFP for imaging-guided surgery to highlight lymph node abnormalities.

Main Results:

  • MFP selectively targets and visualizes monocyte and macrophage populations in vitro and in vivo.
  • The probe enhances signal in areas of inflammation and reduces signal in tumor infiltration, enabling differentiation.
  • Successful visualization of sentinel lymph nodes during imaging-guided surgery was achieved.

Conclusions:

  • MFP provides a novel tool for intraoperative imaging of lymph nodes, aiding in accurate cancer staging.
  • This imaging platform demonstrates potential to eliminate the need for invasive lymph node dissections, reducing surgical complications.
  • The study offers a preclinical foundation for a new standard in intraoperative nodal assessment for cancer patients.