Novel (89)Zr cell labeling approach for PET-based cell trafficking studies

Area of Science:

• Radiochemistry
• Cellular Biology
• Medical Imaging

Background:

• Growing interest in cell-based therapies necessitates improved methods for in vivo cell tracking.
• Positron emission tomography (PET) offers high sensitivity for imaging, with isotopes like (89)Zr allowing for extended observation periods.

Purpose of the Study:

• To evaluate a novel cell labeling approach using the PET isotope (89)Zr for robust in vivo cell tracking.
• To assess the stability, efficiency, and cellular impact of the (89)Zr-DBN labeling agent.

Main Methods:

• Synthesis of the novel labeling agent (89)Zr-desferrioxamine-NCS ((89)Zr-DBN).
• Covalent labeling of mouse melanoma cells, dendritic cells, and human mesenchymal stem cells with (89)Zr-DBN.
• Assessment of label stability via cell efflux studies and in vivo PET imaging.
• Evaluation of labeling's effect on cellular viability using proliferation and cytotoxicity assays.

Main Results:

• The (89)Zr-DBN agent was synthesized with a 55% radiochemical yield.
• (89)Zr-DBN achieved 30-50% cell labeling efficiency with high stability for up to 7 days.
• Labeled cells showed no negative impact on viability, and in vivo studies confirmed radiolabel stability on human mesenchymal stem cells.

Conclusions:

• A robust, general, and biostable cell labeling strategy using (89)Zr-DBN has been developed.
• This approach holds promise for widespread applications in non-invasive, in vivo cell trafficking studies using PET.