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MEMBRANE TRANSPORTERS, ION CHANNELS, AND PUMPS
1Department of Physiology and 2Department of Microbiology and Immunology, Dartmouth Medical School, Hanover; and 3Department of Pathology, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
Submitted 1 September 2005 ; accepted in final form 15 October 2005
The most common mutation in the CFTR gene in individuals with cystic fibrosis (CF), 
F508, leads to the absence of CFTR Cl– channels in the apical plasma membrane, which in turn results in impairment of mucociliary clearance, the first line of defense against inhaled bacteria. Pseudomonas aeruginosa is particularly successful at colonizing and chronically infecting the lungs and is responsible for the majority of morbidity and mortality in patients with CF. Rescue of F508-CFTR by reduced temperature or chemical means reveals that the protein is at least partially functional as a Cl– channel. Thus current research efforts have focused on identification of drugs that restore the presence of CFTR in the apical membrane to alleviate the symptoms of CF. Because little is known about the effects of P. aeruginosa on CFTR in the apical membrane, whether P. aeruginosa will affect the efficacy of new drugs designed to restore the plasma membrane expression of CFTR is unknown. Accordingly, the objective of the present study was to determine whether P. aeruginosa affects CFTR-mediated Cl– secretion in polarized human airway epithelial cells. We report herein that a cell-free filtrate of P. aeruginosa reduced CFTR-mediated transepithelial Cl– secretion by inhibiting the endocytic recycling of CFTR and thus the number of WT-CFTR and F508-CFTR Cl– channels in the apical membrane in polarized human airway epithelial cells. These data suggest that chronic infection with P. aeruginosa may interfere with therapeutic strategies aimed at increasing the apical membrane expression of F508-CFTR.
cystic fibrosis
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