Published in:
01-06-2004 | Editorial
Translational research using the sodium/iodide symporter in imaging and therapy
Authors:
June-Key Chung, Joo Hyun Kang
Published in:
European Journal of Nuclear Medicine and Molecular Imaging
|
Issue 6/2004
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Excerpt
The specific accumulation of iodine in the thyroid gland was first identified in 1915, and its utilisation in clinical medicine led to the birth of nuclear medicine. The thyroid gland concentrates iodide by a factor of 20–40 with respect to its plasma level [
1]. Radioiodines were first used as tracers of thyroid function, and subsequently for the treatment of hyperthyroidism and benign thyroid diseases. In addition, evidence that iodine transport features in thyroid cancer cells provided a basis for the use of radioiodine in the diagnosis and treatment of thyroid cancer [
2]. However, the mechanism of iodine specificity was determined only recently. Iodine enters thyroid cells via a specific transporter, the sodium/iodide symporter (NIS), the gene of which was identified in 1996 [
2]. The driving force of iodide uptake is the transmembrane concentration gradient of sodium ion, which is generated and maintained by sodium-potassium ATPase. NIS is an intrinsic membrane protein with 13 transmembrane domains. …