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Expression and function of cystic fibrosis transmembrane conductance regulator in rat intrapulmonary arteries

¹ Institute of Cellular Physiology and Biology, UMR 6187, National Centre for Scientific Research (CNRS), University of Poitiers, Poitiers, and ² Laboratory of Respiratory Cellular Physiology, University of Bordeaux 2, 33076, Bordeaux, ³ Inserm U885, 33076 Bordeaux, France.

CORRESPONDENCE: C. Guibert, INSERM U885, Laboratoire de Physiologie Cellulaire Respiratoire, 146, rue Léo Saignat, F33076 Bordeaux, France. Fax: 33 557571695. E-mail: christelle.guibert{at}u-bordeaux2.fr

Keywords: Chloride channels, cystic fibrosis transmembrane conductance regulator, intrapulmonary arteries, iodide efflux, smooth muscle cells, vasoreactivity

Received: May 16, 2007
Accepted June 20, 2007

The cystic fibrosis transmembrane conductance regulator (CFTR) gene encodes a cyclic adenosine monophosphate (cAMP)-dependent chloride channel located mainly at the apical membrane of epithelial cells. In myocytes of pulmonary arteries, numerous chloride channels have been identified and described, but not the CFTR. Thus the presence and function of the CFTR was investigated in rat intrapulmonary arteries.

CFTR expression, localisation and function were analysed in cultured smooth muscle cells using Reverse transcriptase (RT)-PCR and immunoprecipitation followed by protein kinase A phosphorylation, immunolocalisation and an iodide efflux assay, respectively. The role of the CFTR in pulmonary vasoreactivity was determined in arterial rings using an organ bath system.

RT-PCR and immunoprecipitation analyses, as well as the immunolocalisation study, revealed the expression of CFTR gene transcripts and protein. The iodide efflux assay showed the existence of functional cAMP-, calcium- and volume-dependent chloride channels. Furthermore, the following effects were found: 1) inhibition of forskolin/genistein-activated iodide efflux by glibenclamide, diphenylamine-2-carboxylic acid and CFTR-specific inhibitor (CFTR_inh)-172; 2) activation of iodide efflux by the benzoquinolizinium derivative CFTR activators MPB-07 and MPB-91; and 3) inhibition of MPB-dependent efflux by CFTR_inh-172. Finally, CFTR activators induced concentration-dependent vasorelaxation in rings preconstricted with phenylephrine, in the presence or absence of endothelium.

The present results are the first to reveal functional cyclic adenosine monophosphate-regulated cystic fibrosis transmembrane conductance regulator contributing to endothelium-independent vasorelaxation in rat intrapulmonary arterial myocytes.

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