Published in:
Open Access
01-11-2010 | Original Article
Synthesis and biological evaluation of [18F]tetrafluoroborate: a PET imaging agent for thyroid disease and reporter gene imaging of the sodium/iodide symporter
Authors:
Maite Jauregui-Osoro, Kavitha Sunassee, Amanda J. Weeks, David J. Berry, Rowena L. Paul, Marcel Cleij, Jasvinder Paul Banga, Michael J. O’Doherty, Paul K. Marsden, Susan E. M. Clarke, James R. Ballinger, Istvan Szanda, Sheue-Yann Cheng, Philip J. Blower
Published in:
European Journal of Nuclear Medicine and Molecular Imaging
|
Issue 11/2010
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Abstract
Purpose
The human sodium/iodide symporter (hNIS) is a well-established target in thyroid disease and reporter gene imaging using gamma emitters 123I-iodide, 131I-iodide and 99mTc-pertechnetate. However, no PET imaging agent is routinely available. The aim of this study was to prepare and evaluate 18F-labelled tetrafluoroborate ([18F]TFB) for PET imaging of hNIS.
Methods
[18F]TFB was prepared by isotopic exchange of BF
4
−
with [18F]fluoride in hot hydrochloric acid and purified using an alumina column. Its identity, purity and stability in serum were determined by HPLC, thin-layer chromatography (TLC) and mass spectrometry. Its interaction with NIS was assessed in vitro using FRTL-5 rat thyroid cells, with and without stimulation by thyroid-stimulating hormone (TSH), in the presence and absence of perchlorate. Biodistribution and PET imaging studies were performed using BALB/c mice, with and without perchlorate inhibition.
Results
[18F]TFB was readily prepared with specific activity of 10 GBq/mg. It showed rapid accumulation in FRTL-5 cells that was stimulated by TSH and inhibited by perchlorate, and rapid specific accumulation in vivo in thyroid (SUV = 72 after 1 h) and stomach that was inhibited 95% by perchlorate.
Conclusion
[18F]TFB is an easily prepared PET imaging agent for rodent NIS and should be evaluated for hNIS PET imaging in humans.