Abstract
Purpose
To date, the in vivo imaging of quantum dots (QDs) has been mostly qualitative or semiquantitative. The development of a dual-function positron emission tomography (PET)/near-infrared fluorescence (NIRF) probe might allow the accurate assessment of the tumor-targeting efficacy of QDs.
Materials and methods
An amine-functionalized QD was conjugated with VEGF protein and DOTA chelator for VEGFR-targeted PET/NIRF imaging after 64Cu-labeling. The targeting efficacy of this dual functional probe was evaluated in vitro and in vivo through cell-binding assay, cell staining, in vivo optical/PET imaging, ex vivo optical/PET imaging, and histology.
Results
The DOTA–QD–VEGF exhibited VEGFR-specific binding in both cell-binding assay and cell staining experiment. Both NIR fluorescence imaging and microPET showed VEGFR-specific delivery of conjugated DOTA–QD–VEGF nanoparticle and prominent reticuloendothelial system uptake. The U87MG tumor uptake of 64Cu-labeled DOTA–QD was less than one percentage injected dose per gram (%ID/g), significantly lower than that of 64Cu-labeled DOTA–QD–VEGF (1.52 ± 0.6%ID/g, 2.81 ± 0.3%ID/g, 3.84 ± 0.4%ID/g, and 4.16 ± 0.5%ID/g at 1, 4, 16, and 24 h post injection, respectively; n = 3). Good correlation was also observed between the results measured by ex vivo PET and NIRF organ imaging. Histologic examination revealed that DOTA–QD–VEGF primarily targets the tumor vasculature through a VEGF–VEGFR interaction.
Conclusion
We have successfully developed a QD-based nanoprobe for dual PET and NIRF imaging of tumor VEGFR expression. The success of this bifunctional imaging approach may render higher degree of accuracy for the quantitative targeted NIRF imaging in deep tissue.
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Acknowledgements
This work was supported by the National Cancer Institute (NCI; R01 CA119053, R21 CA121842, R21 CA102123, P50 CA114747, U54 CA119367, and R24 CA93862), Department of Defense (DOD; W81XWH-07-1-0374, W81XWH-04-1-0697, W81XWH-06-1-0665, W81XWH-06-1-0042, and DAMD17-03-1-0143), and a Benedict Cassen Postdoctoral Fellowship from the Education and Research Foundation of the Society of Nuclear Medicine (to Zi-bo Li and Weibo Cai). We thank Dr. Philip E. Thorpe and Dr. Sophia Ran at UT Southwestern Medical Center, Dallas, for providing the antimouse VEGFR-2 primary antibody. We also thank Dr. Gang Niu for his excellent technical support and the cyclotron team at the University of Wisconsin-Madison for 64Cu production.
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Chen, K., Li, ZB., Wang, H. et al. Dual-modality optical and positron emission tomography imaging of vascular endothelial growth factor receptor on tumor vasculature using quantum dots. Eur J Nucl Med Mol Imaging 35, 2235–2244 (2008). https://doi.org/10.1007/s00259-008-0860-8
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DOI: https://doi.org/10.1007/s00259-008-0860-8