Tumor-Targeted Multimodal Optical Imaging with Versatile Cadmium-Free Quantum Dots

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Optical Imaging

Background:

• Fluorescence imaging technologies require advanced probes.
• Quantum dots offer unique optical properties but face toxicity concerns (cadmium).
• Need for safer, effective fluorescent probes for clinical applications.

Purpose of the Study:

• To develop a versatile, cadmium-free quantum dot-based bioimaging probe.
• To conjugate CuInSe2/ZnS core/shell quantum dots with CGKRK tumor-targeting peptides.
• To evaluate the probe's performance in multimodal tumor imaging.

Main Methods:

• Synthesis of highly luminescent cadmium-free CuInSe2/ZnS core/shell quantum dots.
• Conjugation of quantum dots with CGKRK tumor-targeting peptides.
• In vivo multimodal imaging (near-infrared, time-gated, two-photon) in glioblastoma mouse models.

Main Results:

• The developed probe exhibits excellent photostability, long circulation time, and minimal toxicity.
• The probe demonstrates strong tumor-specific homing and versatile multimodal imaging capabilities.
• In glioblastoma models, the probe accurately delineated tumor boundaries and identified infiltrating cells.

Conclusions:

• Cadmium-free quantum dots conjugated with CGKRK peptides represent a promising bioimaging probe.
• The probe's versatility supports precise tumor detection and surgical guidance.
• This work supports the potential clinical translation of advanced quantum dot imaging agents.