Multi-mode biodegradable tumour-microenvironment sensitive nanoparticles for targeted breast cancer imaging

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Medical Imaging

Background:

• Gas-filled ultrasound (US) contrast agents face limitations due to gas instability and overflow, hindering effective US imaging.
• Developing advanced contrast agents is crucial for improving diagnostic accuracy in various medical imaging modalities.

Purpose of the Study:

• To develop an injectable, multi-modal imaging system capable of generating gas in situ for enhanced tumor visualization.
• To create a pH-responsive nanoparticle (NP) system for simultaneous MR, US, and fluorescence imaging of tumors.

Main Methods:

• Synthesized injectable nanoparticles incorporating Fe3O4 (MR negative contrast agent), Cy5.5 (fluorescent dye), and Na2CO3 (CO2 releasing donor).
• Evaluated the nanoparticles' ability to generate CO2 gas in acidic tumor microenvironments.
• Assessed the performance of the developed system in MR, US, and fluorescence imaging of tumor tissues.

Main Results:

• The nanoparticles continuously generated carbon dioxide (CO2) gas in acidic tumor tissue.
• The CO2 generation resulted in a strong echo signal under ultrasonic imaging.
• The system demonstrated excellent performance in MR and fluorescence imaging, providing effective multi-modal tumor visualization.

Conclusions:

• The developed pH-responsive nanoparticle system effectively integrates MR, US, and fluorescence imaging capabilities.
• This multi-modal imaging approach offers a promising strategy for enhanced tumor detection and diagnosis.
• The study provides a valuable reference for the development of advanced contrast agents for multi-modal tumor imaging.