[No authors listed]
Anoctamins (ANOs) are multifunctional membrane proteins that consist of 10 homologs. ANO1 (TMEM16A) and ANO2 (TMEM16B) are anion channels activated by intracellular calcium that meditate numerous physiological functions. ANO6 is a scramblase that redistributes phospholipids across the cell membrane. The other homologs are not well characterized. We found ANO9/TMEM16J is a cation channel activated by a cAMP-dependent protein kinase A Intracellular cAMP-activated robust currents in whole cells expressing ANO9, which were inhibited by a blocker. A cholera toxin that persistently stimulated adenylate cyclase activated ANO9 as did the application of The cAMP-induced ANO9 currents were permeable to cations. The cAMP-dependent ANO9 currents were augmented by intracellular Ca2+. Ano9 transcripts were predominant in the intestines. Human intestinal SW480 cells expressed high levels of Ano9 transcripts and showed duanyu1529 inhibitor-reversible cAMP-dependent currents. We conclude that ANO9 is a cation channel activated by a pathway and could play a role in intestine function.
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