Minimized background tumor imaging through self-assembled disulfide dicyanine nanoparticles

Area of Science:

• Biomedical Imaging
• Nanotechnology
• Organic Chemistry

Background:

• Fluorescence imaging is crucial for tumor visualization but suffers from high background noise, reducing signal-to-noise ratio (SNR) and accuracy.
• Existing methods struggle with effective tumor-specific signal detection against background interference.

Purpose of the Study:

• To design and synthesize a novel amphiphilic disulfide dicyanine ss-diCy7.
• To develop ss-diCy7 nanoparticles for improved tumor imaging with reduced background and enhanced signal.

Main Methods:

• Synthesis of amphiphilic disulfide dicyanine ss-diCy7.
• Self-assembly of ss-diCy7 into nanoparticles with aggregation-induced quenching.
• In vitro and in vivo evaluation of nanoparticle response to glutathione (GSH) and fluorescence enhancement.
• Comparison with traditional mono-cyanine dyes in a mouse tumor model.

Main Results:

• ss-diCy7 nanoparticles showed a 96% reduction in fluorescence intensity due to aggregation-induced quenching.
• A 24-fold fluorescence enhancement was observed in response to glutathione (GSH) in vitro.
• Enhanced fluorescence signals and reduced background were achieved in cell and mouse imaging, outperforming mono-cyanine dyes.

Conclusions:

• ss-diCy7 nanoparticles offer a promising approach for high-resolution tumor imaging.
• The GSH-responsive fluorescence enhancement mechanism significantly improves tumor visualization.
• This technology has the potential to advance diagnostic accuracy in oncology.