Abstract
Purpose
We evaluated the feasibility of non-invasive imaging of recombinant adenovirus-mediated human sodium-iodide symporter (hNIS) gene expression by 99mTcO4 − scintigraphy in skeletal muscle of rats.
Methods
Replication-defective recombinant adenovirus encoding hNIS gene [Rad-CMV-hNIS 5×107, 2×108 or 1×109 plaque forming units (pfu)] or β-galactosidase gene (Rad-CMV-LacZ 1×109 pfu) was injected into the right biceps femoris muscle of rats (n=5–6 for each group). Three days after gene transfer, scintigraphy was performed using a gamma camera 30 min after injection of 99mTcO4 − (1.85 MBq). An additional two rats injected with 1×109 pfu of Rad-CMV-hNIS underwent 99mTcO4 − scintigraphy with sodium perchlorate. After the imaging studies, rats were sacrificed for assessment of the biodistribution of 99mTcO4 − and measurement of hNIS mRNA expression.
Results
In all the rats injected with 1×109 pfu of Rad-CMV-hNIS, hNIS expression was successfully imaged by 99mTcO4 − scintigraphy, while rats injected with Rad-CMV-LacZ or lower doses of Rad-CMV-hNIS failed to show uptake. The biodistribution studies indicated that a significantly different amount of 99mTcO4 − was retained in the liver (p<0.001) and the right muscle (p<0.05), with the highest uptake in rats injected with 1×109 pfu of Rad-CMV-hNIS. The muscular hNIS mRNA level quantified by real-time reverse transcription-polymerase chain reaction was significantly higher in rats injected with 1×109 pfu of Rad-CMV-hNIS (p<0.05), with a positive correlation with the imaging counts (r=0.810, p<0.05) and the biodistribution (r=0.847, p<0.001). Hot spots in rats injected with 1×109 pfu of Rad-CMV-hNIS were specifically inhibited by sodium perchlorate.
Conclusion
This study illustrated that 99mTcO4 − scintigraphy can monitor Rad-CMV-hNIS-mediated gene expression in skeletal muscle of rats, non-invasively and quantitatively.
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Acknowledgements
We are grateful to Sissy M. Jhiang (Department of Physiology, Ohio State University, Ohio, USA) for generously providing recombinant adenoviral-human sodium-iodide symporter gene. We also wish to thank Kyong-Rye Dong, and Joon-Hong Cheon (Department of Nuclear Medicine, Asan Medical Center, Seoul, Korea) for their skilful technical assistance in nuclear imaging. This study was supported by a grant (02-287) from the Asan Institute for Life Sciences, Seoul, Korea.
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Yang, H.S., Lee, H., Kim, S.J. et al. Imaging of human sodium-iodide symporter gene expression mediated by recombinant adenovirus in skeletal muscle of living rats. Eur J Nucl Med Mol Imaging 31, 1304–1311 (2004). https://doi.org/10.1007/s00259-004-1570-5
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DOI: https://doi.org/10.1007/s00259-004-1570-5