Gallium-68 PET Imaging Shows the Pathways of Nanoerythrosomes in Rats

Summary of Research on Nanoerythrosomes and Gallium-68 Radiolabeling

Objective:
To investigate the biodistribution of nanoerythrosomes (NanoEs), mimics of extracellular vesicles made from donated human blood, using gallium-68 (Ga-68) for positron emission tomography (PET) imaging in healthy rats.

Key Findings:

1. Radiolabeling Method:

   • NanoEs were radiolabeled with the [68Ga]Ga-tris(8-hydroxyquinoline) complex.
   • The labeling process took approximately 77 minutes, yielding a decay-corrected radiochemical yield of 35%.

2. Biodistribution Analysis:

   • The study involved administering the labeled NanoEs to Sprague-Dawley rats and conducting PET scans for 60 minutes.
   • Tissue collection post-imaging allowed for quantification of radioactivity.
   • Higher uptake of [68Ga]Ga-tris(8-hydroxyquinoline)-NanoEs was observed in the liver, pancreas, and blood cells compared to control groups.

3. Comparison with Controls:

   • Control groups included rats given [68Ga]GaCl3, the free [68Ga]Ga-tris(8-hydroxyquinoline) complex, and NanoEs labeled with [68Ga]GaCl3.
   • The distinct uptake patterns demonstrated that the tris(8-hydroxyquinoline) labeling method provides unique information about the biodistribution of NanoEs.

4. Significance:

   • The results suggest that nanoerythrosomes could be effective as biocompatible nanocarriers for drug delivery and diagnostics.
   • The study lays groundwork for future research on the therapeutic applications of NanoEs.

Conclusion:

The research indicates a viable strategy for using gallium-68 to track the biodistribution of nanoerythrosomes, which holds promise for clinical applications in drug delivery and imaging.

Reference:

Kunnas, J., et al. (2026). In vivo tracking of nanoerythrosomes with gallium-68 labeling strategies. EJNMMI Radiopharmacy and Chemistry. Find the full article here.