Ítem
Solo Metadatos
Characterization of small-molecule inhibitors of the sodium iodide symporter
Título de la revista
Autores
Lindenthal, Sabine
Lecat-Guillet, Nathalie
Ondo Méndez, Alejandro Oyono
Ambroise, Yves
Rousseau, Bernard
Pourcher, Thierry
Fecha
2009-03
Directores
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Editor
Society for Endocrinology
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Resumen
Abstract
The sodium/iodide symporter (NIS) mediates the active transport of iodide from the bloodstream into thyrocytes. NIS function is strategic for the diagnosis and treatment of various thyroid diseases. In addition, a promising anti-cancer strategy based on targeted NIS gene transfer in non-thyroidal cells is currently developed. However, only little information is available concerning the molecular mechanism of NIS-mediated iodide translocation. Ten small molecules have recently been identified using a high-throughput screening method for their inhibitory effect on iodide uptake of NIS-expressing mammalian cells. In the present study, we analyzed these compounds for their rapid and reversible effects on the iodide-induced current in NIS-expressing Xenopus oocytes. Four molecules almost completely inhibited the iodide-induced current; for three of them the effect was irreversible, for one compound the initial current could be fully re-established after washout. Three molecules showed a rapid inhibitory effect of about 75%, half of which was reversible. Another three compounds inhibited the iodide-induced current from 10 to 50%. Some molecules altered the membrane conductance by themselves, i.e. in the absence of iodide. For one of these molecules the observed effect was also found in water-injected oocytes whereas for some others the iodide-independent effect was associated with NIS expression. The tested molecules show a surprisingly high variability in their possible mode of action, and thus are promising tools for further functional characterization of NIS on a molecular level, and they could be useful for medical applications.
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Keywords
Symporters , antagonists & inhibitors , Molecular structure , Drug evaluation , preclinical , Oocytes , metabolism
