Abstract
Purpose
There is growing interest in the human sodium/iodide symporter (NIS) gene both as a molecular imaging reporter gene and as a therapeutic gene. Here, we show the feasibility of radioisotope therapy of neuroendocrine tumors. As a separate application of NIS gene transfer, we image NIS-expressing tumors with pinhole SPECT in living subjects.
Methods
Biodistribution studies and in vivo therapy experiments were performed in nude mice carrying stably NIS-expressing neuroendocrine tumor xenografts following i.v. injection of 131I and 99mTc pertechnetate. To show the usefulness of NIS as an imaging reporter gene, 99mTc pertechnetate uptake was imaged in vivo using a clinical gamma camera in combination with a custom-made single pinhole collimator, followed by SPECT/small animal MRI data coregistration.
Results
NIS-expressing neuroendocrine tumors strongly accumulated 131I and 99mTc pertechnetate, as did thyroid, stomach, and salivary gland. The volume of NIS-expressing neuroendocrine tumors decreased significantly after therapeutic administration of 131I or 99mTc pertechnetate, whereas control tumors continued to grow. NIS-mediated uptake of 99mTc pertechnetate could be imaged in vivo at high resolution with a clinical gamma camera equipped with a custom-made single pinhole collimator. High-resolution functional and morphologic information could be combined in a single three-dimensional data set by coregistration of SPECT and small animal MRI data. Lastly, we demonstrated a therapeutic effect of 99mTc pertechnetate on NIS-expressing neuroendocrine tumors in cell culture and, for the first time, in vivo, thought to be due to emitted Auger and conversion electrons.
Conclusions
NIS-expressing neuroendocrine tumors efficiently concentrate radioisotopes, allowing for in vivo high-resolution small animal SPECT imaging as well as rendering possible successful radioisotope therapy of neuroendocrine tumors.
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Acknowledgements
This study was supported in part by a research scholarship No. SCHI 644/1-1 (M.L.S.) from the Deutsche Forschungsgemeinschaft (German Research Society, DFG), and by grants No. 12/2000 (M.L.S.) from the Stiftung P.E. Kempkes (Kempkes Foundation), Marburg, and No. 10-1600-Be2 (T.M.B.) and No. 10-01193 (A.E.H.), both from the Deutsche Krebshilfe (German Cancer Aid). We thank Birgit Herbst (Department of Nuclear Medicine, Philipps University Marburg) for expert technical assistance and Claudia Cyborn (Institute for Anatomy and Cell Biology, Philipps University Marburg) for outstanding help with animal experiments. All experiments performed in this study comply with current German laws and regulations, including ethics approval.
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Schipper, M.L., Riese, C.G.U., Seitz, S. et al. Efficacy of 99mTc pertechnetate and 131I radioisotope therapy in sodium/iodide symporter (NIS)-expressing neuroendocrine tumors in vivo. Eur J Nucl Med Mol Imaging 34, 638–650 (2007). https://doi.org/10.1007/s00259-006-0254-8
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DOI: https://doi.org/10.1007/s00259-006-0254-8