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Cystic Fibrosis/Pulmonary Research and Treatment Center, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599
Evidence of absorptive or secretory ion transport in different
respiratory regions of the mouse was sought by assessing the regional
distribution of
-,
-, and
-epithelial sodium channel (ENaC; Na+ absorptive), cystic fibrosis transmembrane
conductor regulator (CFTR), and
Na+-K+-2Cl
cotransporter mRNAs.
High levels of ENaC subunit expression were found in nasal surface
epithelium and gland ducts. CFTR was expressed in both superficial
nasal respiratory epithelium and glands. These results are consistent
with basal amiloride-sensitive Na+ absorption and
cAMP-dependent Cl
secretion in murine nasal epithelia.
Expression of all three ENaC subunits increased progressively from
trachea to terminal bronchioles. Intermediate levels of CFTR and
cotransporter expression in bronchial epithelium diminished in
bronchioles. The low abundance of CFTR mRNA throughout murine pulmonary
epithelium is consistent with functional data that attributes
Cl
secretion predominantly to an alternative
Cl
channel.
-ENaC as the only mRNA found in all
regions of airway epithelia is consistent with the
-subunit as
requisite for Na+ absorption, and the increased expression
of
-,
-, and
-ENaC in distal airways suggests a greater
absorptive capability in this region.
cystic fibrosis transmembrane conductor regulator; epithelial sodium channel; sodium potassium-chloride cotransporter; nasal
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