Abstract
Porcine thyroid cells in culture are able to reorganize into well-polarized follicle-like structures in the presence of cAMP analogs. These follicles exhibit on their basolateral membrane domain the Na+/I− symporter which allows iodide to accumulate in the thyrocytes. The initial rate of iodide influx through the Na+/I− symporter is inhibited up to 98% by the chloride channel blockers. 5 nitro-2(3-phenylpropylamino)benzoic acid and 3′,5-Dichlorodiphenylamine-2-carboxylic acid are the most effective inhibitors, with a K0.5 value of 60 μM. This inhibition is not secondary to inhibition of chloride transport. Other chloride transporter blockers have been studied but showed lesser activities.
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