NDLI: Abnormal surface liquid pH regulation by cultured cystic fibrosis bronchial epithelium.

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Abnormal surface liquid pH regulation by cultured cystic fibrosis bronchial epithelium.

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Abnormal surface liquid pH regulation by cultured cystic fibrosis bronchial epithelium.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Paradiso, Anthony M. Boucher, Richard C. Gatzy, John T. Johnson, Larry G. Kreda, Sylvia M. O'neal, Wanda K. Coakley, Raymond D. Grubb, Barbara R.
Description	Author Affiliation: Coakley RD ( Cystic Fibrosis/Pulmonary Research and Treatment Center, School of Medicine, University of North Carolina, Chapel Hill, NC 27599-7248, USA.);
Abstract	Cystic fibrosis (CF) transmembrane conductance regulator (CFTR)-dependent airway epithelial bicarbonate transport is hypothesized to participate in airway surface liquid pH regulation and contribute to lung defense. We measured pH and ionic composition in apical surface liquid (ASL) on polarized normal (NL) and CF primary bronchial epithelial cell cultures under basal conditions, after cAMP stimulation, and after challenge with luminal acid loads. Under basal conditions, CF epithelia acidified ASL more rapidly than NL epithelia. Two ASL pH regulatory paths that contributed to basal pH were identified in the apical membrane of airway epithelia, and their activities were measured. We detected a ouabain-sensitive (nongastric) H+,K+-ATPase that acidified ASL, but its activity was not different in NL and CF cultures. We also detected the following evidence for a CFTR-dependent HCO3- secretory pathway that was defective in CF: (i). ASL [HCO3-] was higher in NL than CF ASL; (ii). activating CFTR with forskolin/3-isobutyl-1-methylxanthine alkalinized NL ASL but acidified CF ASL; and (iii). NL airway epithelia more rapidly and effectively alkalinized ASL in response to a luminal acid challenge than CF epithelia. We conclude that cultured human CF bronchial epithelial pHASL is abnormally regulated under basal conditions because of absent CFTR-dependent HCO3- secretion and that this defect can lead to an impaired capacity to respond to airway conditions associated with acidification of ASL.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	26
Volume Number	100
Language	English
Publisher	National Academy of Sciences
Publisher Date	2003-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Cystic Fibrosis Physiopathology Hydrogen-Ion Concentration Respiratory Mucosa Bicarbonates Metabolism Bronchi Pathology Genetics Surgery Cystic Fibrosis Transmembrane Conductance Regulator Physiology Gene Expression Regulation, Enzymologic H(+)-K(+)-Exchanging ATPase Homeostasis Lung Transplantation RNA, Messenger Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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