AUTHOR=Zhang Donglei , Ciciriello Fabiana , Anjos Suzana , Carissimo Annamaria , Liao Jie , Carlile Graeme , Balghi Haouaria , Robert Renaud , Luini Alberto , Hanrahan John , Thomas David TITLE=Ouabain Mimics Low Temperature Rescue of F508del-CFTR in Cystic Fibrosis Epithelial Cells JOURNAL=Frontiers in Pharmacology VOLUME=3 YEAR=2012 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2012.00176 DOI=10.3389/fphar.2012.00176 ISSN=1663-9812 ABSTRACT=

Most cases of cystic fibrosis (CF) are caused by the deletion of a single phenylalanine residue at position 508 of the cystic fibrosis transmembrane conductance regulator (CFTR). The mutant F508del-CFTR is retained in the endoplasmic reticulum and degraded, but can be induced by low temperature incubation (29°C) to traffic to the plasma membrane where it functions as a chloride channel. Here we show that, cardiac glycosides, at nanomolar concentrations, can partially correct the trafficking of F508del-CFTR in human CF bronchial epithelial cells (CFBE41o-) and in an F508del-CFTR mouse model. Comparison of the transcriptional profiles obtained with polarized CFBE41o-cells after treatment with ouabain and by low temperature has revealed a striking similarity between the two corrector treatments that is not shared with other correctors. In summary, our study shows a novel function of ouabain and its analogs in the regulation of F508del-CFTR trafficking and suggests that compounds that mimic this low temperature correction of trafficking will provide new avenues for the development of therapeutics for CF.