Epithelial Chloride Transport by CFTR Requires TMEM16A.

ABSTRACT: Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) is the secretory chloride/bicarbonate channel in airways and intestine that is activated through ATP binding and phosphorylation by protein kinase A, but fails to operate in cystic fibrosis (CF). TMEM16A (also known as anoctamin 1, ANO1) is thought to function as the Ca²⁺ activated secretory chloride channel independent of CFTR. Here we report that tissue specific knockout of the TMEM16A gene in mouse intestine and airways not only eliminates Ca²⁺-activated Cl^- currents, but unexpectedly also abrogates CFTR-mediated Cl^- secretion and completely abolishes cAMP-activated whole cell currents. The data demonstrate fundamentally new roles of TMEM16A in differentiated epithelial cells: TMEM16A

SUBMITTER: Benedetto R 

PROVIDER: S-EPMC5622110 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature