Surface-modified ^99mTc-Lactoferrin nanoparticles as tracers for sentinel lymph node mapping

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Radiopharmaceuticals

Background:

• Sentinel lymph node (SLN) mapping is crucial for cancer staging.
• Radioactive technetium-99 m (99mTc)-labelled lactoferrin nanoparticles (LF-NPs) were previously investigated for SLN mapping.
• Unmodified LF-NPs showed limitations in in vivo SLN accumulation despite promising in vitro results.

Purpose of the Study:

• To enhance the in vivo performance of LF-NPs for SLN detection.
• To investigate the efficacy of surface modification, specifically PEGylation, on LF-NPs.
• To evaluate the improved cellular uptake and SLN accumulation of modified LF-NPs.

Main Methods:

• Surface modification of LF-NPs using polyethylene glycol (PEG) to create LF-NP@PEG.
• In vitro characterization and cellular uptake studies using RAW 264.7 macrophages.
• In vivo evaluation in an animal model, including scintigraphic imaging for SLN uptake and retention analysis.

Main Results:

• PEGylated LF-NPs (LF-NP@PEG) demonstrated superior characteristics compared to unmodified LF-NPs.
• In vitro studies showed significantly greater cellular uptake of LF-NP@PEG.
• In vivo studies in an animal model revealed increased SLN uptake and retention of LF-NP@PEG, confirmed by imaging.

Conclusions:

• Surface modification of LF-NPs with PEG significantly improves their in vivo performance for SLN detection.
• LF-NP@PEG exhibits enhanced cellular uptake and SLN accumulation, suggesting potential for improved diagnostic imaging.
• Further refinements may optimize modified LF-NPs for clinical application in SLN mapping.