Small Molecule PET Tracers for Transporter Imaging.

Area of Science:

• Biomedical Imaging
• Radiopharmaceutical Science
• Molecular Biology

Background:

• Transporters play a vital role in the uptake and distribution of radiotracers used in Positron Emission Tomography (PET).
• They can be primary targets for radioligands or facilitate tracer passage, impacting imaging of neurological and metabolic processes.
• Understanding transporter function is key to developing effective PET tracers for disease diagnosis and monitoring.

Purpose of the Study:

• To review the diverse roles of transporters in in vivo PET radiotracer development and application.
• To highlight the significance of transporters as targets and facilitators in PET imaging.
• To emphasize the growing importance of transporters in understanding human health and disease.

Main Methods:

• Literature review of existing research on transporters and PET radiotracers.
• Analysis of how different transporter types (uptake, efflux) affect radiotracer behavior.
• Discussion of examples of radiotracers targeting or utilizing transporters.

Main Results:

• Transporters are essential for the distribution of many PET radiotracers, even when not the primary target.
• Specific transporters can be targeted with high-affinity radioligands for imaging neural pathways.
• Efflux transporters like p-glycoprotein can limit radiotracer uptake, posing challenges for imaging.

Conclusions:

• Transporters are integral to PET radiopharmaceutical development, influencing tracer uptake, distribution, and function.
• Their diverse roles necessitate continued focus on transporter imaging for advancing PET applications in medicine.
• Transporters are now recognized alongside other major protein targets in PET research for human health and disease studies.