Dynamic modulation of ANO1/TMEM16A HCO3- permeability by Ca2+/calmodulin

Jinsei Jung, Joo Hyun Nam, Hyun Woo Park, Uhtaek Oh, Joo Heon Yoon, Min Goo Lee

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129 Citations (Scopus)


Anoctamin 1 (ANO1)/transmembrane protein 16A (TMEM16A) is a calcium-activated anion channel that may play a role in HCO3 - secretion in epithelial cells. Here, we report that the anion selectivity of ANO1 is dynamically regulated by the Ca2+/calmodulin complex. Whole-cell current measurements in HEK 293T cells indicated that ANO1 becomes highly permeable to HCO3- at high [Ca 2+]i. Interestingly, this result was not observed in excised patches, indicating the involvement of cytosolic factors in this process. Further studies revealed that the direct association between ANO1 and calmodulin at high [Ca2+]i is responsible for changes in anion permeability. Calmodulin physically interacted with ANO1 in a [Ca 2+]i-dependent manner, and addition of recombinant calmodulin to the cytosolic side of excised patches reversibly increased P HCO3/PCl. In addition, the high [Ca2+] i-induced increase in HCO3- permeability was reproduced in mouse submandibular gland acinar cells, in which ANO1 plays a critical role in fluid secretion. These results indicate that the HCO 3- permeability of ANO1 can be dynamically modulated and that ANO1 may play an important role in cellular HCO3- transport, especially in transepithelial HCO3- secretion.

Original languageEnglish
Pages (from-to)360-365
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number1
Publication statusPublished - 2013 Jan 2

All Science Journal Classification (ASJC) codes

  • General


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