Abstract
The sodium iodide symporter NIS) is an intrinsic plasma membrane protein that mediates the active transport of iodide in the thyroid gland and a number of extrathyrioidal tissues, in particular lactating mammary gland. Because of its crucial role in the ability of thyroid follicular cells to trap iodide of NIS opened an exciting and extensivenew field of thyroid-related research. Cloning and molecular characterization of NIS allowed investigation of its expression and regulation in thyroidal and nonthyroidal tissues, and its potential pathophysiological and therepeutic implications is benign and malignant thyroid diseases. In addition, NIS-mediated iodide accumulation allows diagnostic thyroid scintigraphy as well as effective therapeutic application of radio-iodide in benign and malignant thyroid disease. characterization and application of NIS as a novel therapeutic gene for cytoreductive gene therapy of extrathyroidal tumors, and the presence of high endogenous NIS expression in the majority of breast cancers further suggest a promising role of NIS in diagnosis and therapy of cancer outside the thyroid gland.
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