PSMA-Targeted Intracellular Self-Assembled Probe for Enhanced PET Imaging.

Area of Science:

• Nuclear medicine
• Oncology
• Biomedical engineering

Background:

• Positron-emission tomography (PET) is highly sensitive for cancer diagnosis.
• Current PET probes face challenges with tumor accumulation and delivery efficiency.
• Prostate cancer diagnosis requires sensitive and specific imaging techniques.

Purpose of the Study:

• To develop a novel PET imaging probe for enhanced prostate cancer diagnosis.
• To improve signal-to-noise ratio and tumor accumulation using an intracellular self-assembly strategy.
• To leverage a prostate-specific membrane antigen (PSMA)-targeting motif for targeted delivery.

Main Methods:

• Design and synthesis of the ⁶⁸Ga-CBT-PSMA PET imaging probe.
• Utilizing a glutamate-urea-based PSMA-targeting motif for specific cancer cell recognition.
• Employing an intracellular self-assembly strategy triggered by glutathione reduction.
• Evaluating probe performance in enhancing PET imaging signals and resolution.

Main Results:

• The ⁶⁸Ga-CBT-PSMA probe demonstrated enhanced accumulation within tumor cells via self-assembly.
• Significant improvement in PET imaging signal intensity and signal-to-noise ratio was observed.
• The probe facilitated precise localization and diagnosis of prostate cancer.
• The intracellular self-assembly strategy effectively amplified PET imaging signals.

Conclusions:

• The novel ⁶⁸Ga-CBT-PSMA PET probe offers improved diagnostic capabilities for prostate cancer.
• Intracellular self-assembly is a promising strategy for enhancing PET imaging signal and resolution.
• This approach advances targeted cancer diagnosis and localization techniques.