Abstract
Purpose
The purpose of the study is to develop a targeted nanoparticle platform for T cell labeling and tracking in vivo.
Procedures
Through carboxylation of the polyethylene glycol (PEG) surface of SPION, carboxylated-PEG-SPION (IOPC) was generated as a precursor for further conjugation with the targeting probe. The IOPC could readily cross-link with a variety of amide-containing molecules by exploiting the reaction between 1-ethyl-3-(3-(dimethylamino)propyl)carbodiimide and N-hydroxysuccinimide. The subsequent conjugation of monoclonal anti-CD3 antibody with IOPC made it possible to construct a magnetic resonance imaging (MRI) contrast agente (CA) that targets T cells, named IOPC-CD3.
Results
IOPC-CD3 was found to have high transverse relaxivity, good targeting selectivity, and good safety profile in vitro. The utility of this newly synthesized CA was explored in an in vivo rodent collagen-induced arthritis (CIA) model of rheumatoid arthritis. Serial MRI experiments revealed a selective decrease in the signal-to-noise ratio of the femoral growth plates of CIA rats infused with IOPC-CD3, with this finding being consistent with immunohistochemical results showing the accumulation of T cells and iron oxide nanoparticles in the corresponding region.
Conclusions
Together with the abovementioned desirable features, these results indicate that IOPC-CD3 offers a promising prospect for a wide range of cellular and molecular MRI applications.
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Acknowledgments
This study was supported by a grant from the National Science Council (NSC 99-2314-B-016-31-MY3).
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The authors report having a pending patent related to subject matter discussed in this article.
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Chih-Lung Chen and Tiing Yee Siow these authors made equal contributions.
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Chen, CL., Siow, T.Y., Chou, CH. et al. Targeted Superparamagnetic Iron Oxide Nanoparticles for In Vivo Magnetic Resonance Imaging of T-Cells in Rheumatoid Arthritis. Mol Imaging Biol 19, 233–244 (2017). https://doi.org/10.1007/s11307-016-1001-6
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DOI: https://doi.org/10.1007/s11307-016-1001-6