Iodide excess regulates its own efflux: A possible involvement of pendrin

Jamile Calil-Silveira, Caroline Serrano-Nascimento, Peter Andreas Kopp, Maria Tereza Nunes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Adequate iodide supply and metabolism are essential for thyroid hormones synthesis. In thyrocytes, iodide uptake is mediated by the sodium-iodide symporter, but several proteins appear to be involved in iodide efflux. Previous studies demonstrated that pendrin is able to mediate apical efflux of iodide in thyrocytes. Acute iodide excess transiently impairs thyroid hormone synthesis, a phenomenon known as the Wolff-Chaikoff effect. Although the escape from this inhibitory effect is not completely understood, it has been related to the inhibition of sodium-iodide symporter-mediated iodide uptake. However, the effects of iodide excess on iodide efflux have not been characterized. Herein, we investigated the consequences of iodide excess on pendrin abundance, subcellular localization, and iodide efflux in rat thyroid PCCl3 cells. Our results indicate that iodide excess increases pendrin abundance and plasma membrane insertion after 24 h of treatment. Moreover, iodide excess increases pendrin half-life. Finally, iodide exposure also increases iodide efflux from PCCl3 cells. In conclusion, these data suggest that pendrin may have an important role in mediating iodide efflux in thyrocytes, especially under conditions of iodide excess.

Original languageEnglish (US)
Pages (from-to)C576-C582
JournalAmerican Journal of Physiology - Cell Physiology
Issue number7
StatePublished - Apr 1 2016


  • Iodide efflux
  • Iodide excess
  • Pendrin
  • Wolff-Chaikoff effect escape

ASJC Scopus subject areas

  • Physiology
  • Cell Biology


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