Abstract
The C2 domain of synaptotagmin I, which binds to anionic phospholipids in cell membranes, was shown to bind to the plasma membrane of apoptotic cells by both flow cytometry and confocal microscopy. Conjugation of the protein to superparamagnetic iron oxide nanoparticles allowed detection of this binding using magnetic resonance imaging. Detection of apoptotic cells, using this novel contrast agent, was demonstrated both in vitro, with isolated apoptotic tumor cells, and in vivo, in a tumor treated with chemotherapeutic drugs.
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Acknowledgements
This work was supported by grants from the Cancer Research Campaign and the Medical Research Council, UK. We would like to thank Ray Hicks for help with the flow cytometry and Lyn Carter and Jeremy Skepper for help with tumor sectioning and confocal microscopy.
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Zhao, M., Beauregard, D., Loizou, L. et al. Non-invasive detection of apoptosis using magnetic resonance imaging and a targeted contrast agent. Nat Med 7, 1241–1244 (2001). https://doi.org/10.1038/nm1101-1241
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DOI: https://doi.org/10.1038/nm1101-1241
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