Calcium-activated chloride channel

The family of calcium-activated chloride channels (CaCCs), which includes chloride channel accessory (CLCA), bestrophin (BEST), and certain anoctamin (ANO or TMEM16) channels, are heterogeneous groups of ligand-gated ion channels for chloride that have been identified in many epithelial and endothelial cell types as well as in smooth muscle cells. ANO1 is highly expressed in human gastrointestinal interstitial cells of Cajal, which are proteins which serve as intestinal pacemakers for peristalsis. In addition to their role as chloride channels some CLCA proteins function as adhesion molecules and may also have roles as tumour suppressors.