title: The Cystic Fibrosis Transmembrane Conductance Regulator Potentiator Ivacaftor Augments Mucociliary Clearance Abrogating Cystic Fibrosis Transmembrane Conductance Regulator Inhibition by Cigarette Smoke.
abstract: Acquired cystic fibrosis transmembrane conductance regulator (CFTR) dysfunction may contribute to chronic obstructive pulmonary disease pathogenesis and is a potential therapeutic target. We sought to determine the acute effects of cigarette smoke on ion transport and the mucociliary transport apparatus, their mechanistic basis, and whether deleterious effects could be reversed with the CFTR potentiator ivacaftor (VX-770). Primary human bronchial epithelial (HBE) cells and human bronchi were exposed to cigarette smoke extract (CSE) and/or ivacaftor. CFTR function and expression were measured in Ussing chambers and by surface biotinylation. CSE-derived acrolein modifications on CFTR were determined by mass spectroscopic analysis of purified protein, and the functional microanatomy of the airway epithelia was measured by 1-μm resolution optical coherence tomography. CSE reduced CFTR-dependent current in HBE cells (P < 0.05) and human bronchi (P < 0.05) within minutes of exposure. The mechanism involved CSE-induced reduction of CFTR gating, decreasing CFTR open-channel probability by approximately 75% immediately after exposure (P < 0.05), whereas surface CFTR expression was partially reduced with chronic exposure, but was stable acutely. CSE treatment of purified CFTR resulted in acrolein modifications on lysine and cysteine residues that likely disrupt CFTR gating. In primary HBE cells, CSE reduced airway surface liquid depth (P < 0.05) and ciliary beat frequency (P < 0.05) within 60 minutes that was restored by coadministration with ivacaftor (P < 0.005). Cigarette smoking transmits acute reductions in CFTR activity, adversely affecting the airway surface. These effects are reversible by a CFTR potentiator in vitro, representing a potential therapeutic strategy in patients with chronic obstructive pulmonary disease with chronic bronchitis.
authors: Departments of 1 Medicine.|2 the Cystic Fibrosis Research Center.
authors: S Vamsee
authors: SV
authors: Raju
authors: Departments of 1 Medicine.
authors: Vivian Y
authors: VY
authors: Lin
authors: 3 Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts.
authors: Limbo
authors: L
authors: Liu
authors: 2 the Cystic Fibrosis Research Center.|4 Cell Developmental and Integrative Biology.
authors: Carmel M
authors: CM
authors: McNicholas
authors: Departments of 1 Medicine.
authors: Suman
authors: S
authors: Karki
authors: Departments of 1 Medicine.
authors: Peter A
authors: PA
authors: Sloane
authors: Departments of 1 Medicine.|2 the Cystic Fibrosis Research Center.
authors: Liping
authors: L
authors: Tang
authors: Departments of 1 Medicine.|2 the Cystic Fibrosis Research Center.
authors: Patricia L
authors: PL
authors: Jackson
authors: 2 the Cystic Fibrosis Research Center.|4 Cell Developmental and Integrative Biology.
authors: Wei
authors: W
authors: Wang
authors: 5 Targeted Metabolomics and Proteomics Laboratory.
authors: Landon
authors: L
authors: Wilson
authors: 6 Optometry.
authors: Kevin J
authors: KJ
authors: Macon
authors: 2 the Cystic Fibrosis Research Center.
authors: Marina
authors: M
authors: Mazur
authors: Departments of 1 Medicine.|2 the Cystic Fibrosis Research Center.
authors: John C
authors: JC
authors: Kappes
authors: 2 the Cystic Fibrosis Research Center.|6 Optometry.
authors: Lawrence J
authors: LJ
authors: DeLucas
authors: 5 Targeted Metabolomics and Proteomics Laboratory.|7 Pharmacology, and.
authors: Stephen
authors: S
authors: Barnes
authors: 2 the Cystic Fibrosis Research Center.|4 Cell Developmental and Integrative Biology.
authors: Kevin
authors: K
authors: Kirk
authors: 3 Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, Massachusetts.
authors: Guillermo J
authors: GJ
authors: Tearney
authors: Departments of 1 Medicine.|2 the Cystic Fibrosis Research Center.|4 Cell Developmental and Integrative Biology.|8 Pediatrics, University of Alabama at Birmingham, Birmingham, Alabama; and.
authors: Steven M
authors: SM
authors: Rowe
mesh_terms: D000171:Acrolein / Q000494:pharmacology; D000595:Amino Acid Sequence; D000627:Aminophenols / Q000494:pharmacology*; D001980:Bronchi / Q000473:pathology; D002478:Cells, Cultured; D002923:Cilia / Q000187:drug effects / Q000378:metabolism; D019005:Cystic Fibrosis Transmembrane Conductance Regulator / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism*; D004847:Epithelial Cells / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D015640:Ion Channel Gating / Q000187:drug effects; D009079:Mucociliary Clearance / Q000187:drug effects*; D009092:Mucous Membrane / Q000473:pathology; D015363:Quinolones / Q000494:pharmacology*; D012907:Smoking / Q000009:adverse effects*; D041623:Tomography, Optical Coherence; D014132:Trachea / Q000473:pathology
chemical_list: D000627:Aminophenols; D015363:Quinolones; D019005:Cystic Fibrosis Transmembrane Conductance Regulator; C545203:ivacaftor; D000171:Acrolein
keywords: cigarette smoke; cystic fibrosis transmembrane conductance regulator potentiator; ivacaftor; mucociliary transport; optical coherence tomography