title: Expression and function of epithelial anoctamins.
abstract: Endogenous Ca(2+)-activated Cl(-) currents (CaCCs) are abundant and present in very different cell types. Very good evidence has been provided that endogenous CaCC is produced by anoctamin 1 (Ano1) and Ano2. Insight into the physiological role of anoctamins has been provided for Ano1, Ano2 and Ano6; however, the physiological role of the other seven members of the anoctamin family remains obscure. Anoctamins 1 and 2 may operate as individual Ca(2+)-sensitive channel proteins or may require accessory subunits for complete function. We find that overexpressed Ano1 has properties resembling all those of endogenous CaCCs, although with some noticeable biophysical and regulatory differences when compared with endogenous channels. Apart from Ano1 and Ano2, expression of Ano6 also produces a Cl(-) conductance. Depending on the cellular background, Ano6 currents may have variable properties. Anoctamins 1 and 6 are frequent in epithelial cells, often coexpressed together with Ano8, Ano9 and Ano10. Most available data on anoctamins were obtained from mouse tissues and from cultured cells, which may not be representative of native human tissues.
authors: Universität Regensburg, Institut für Physiologie, Universitätsstraße 31, Regensburg, Germany. karl.kunzelmann@vkl.uni-regensburg.de
authors: Karl
authors: K
authors: Kunzelmann
authors: Rainer
authors: R
authors: Schreiber
authors: Arthur
authors: A
authors: Kmit
authors: Walailak
authors: W
authors: Jantarajit
authors: Joana Raquel
authors: JR
authors: Martins
authors: Diana
authors: D
authors: Faria
authors: Patthara
authors: P
authors: Kongsuphol
authors: Jiraporn
authors: J
authors: Ousingsawat
authors: Yuemin
authors: Y
authors: Tian
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D018118:Chloride Channels / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism*; D004848:Epithelium / Q000378:metabolism; D006801:Humans; D051379:Mice; D018345:Mice, Knockout
chemical_list: D018118:Chloride Channels; D002118:Calcium