Pflugers Arch 2001 Jan 01;443 Suppl 1:S107-10. doi: 10.1007/s004240100655.

Ca(2+)-activated Cl(-) channels: a newly emerging anion transport family.

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A new family of chloride transport proteins has recently emerged. These proteins have extensive homology to a protein previously isolated from bovine tracheal epithelium that acts as a Ca(2+)-sensitive Cl(-) channel (CaCC) when heterologously expressed or when reconstituted into planar lipid bilayers. Several new members of this family have been identified in human, murine, and bovine epithelia, in addition to some other tissues, and are associated with Ca(2+)-sensitive conductive chloride transport when heterologously expressed in Xenopus oocytes or HEK 293 cells. The expressed current is also sensitive to inhibitors such as DIDS and niflumic acid. In addition, at least one family member acts as an endothelial cell adhesion molecule. This emerging family may underlie the Ca(2+)-mediated Cl(-) conductance responsible for rescue of the cystic fibrosis (CF) knockout mouse from significant airway disease.

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