TY - JOUR
T1 - Transcellular thiocyanate transport by human airway epithelia
AU - Fragoso, Miryam A.
AU - Fernandez, Vania
AU - Forteza, Rosanna
AU - Randell, Scott H.
AU - Salathe, Matthias
AU - Conner, Gregory E.
PY - 2004/11/15
Y1 - 2004/11/15
N2 - Human airway mucosa synthesizes and secretes lactoperoxidase (LPO). As H2O2 and thiocyanate (SCN-) are also present, a functional LPO antibacterial defence system exists in the airways. SCN- concentrations in several epithelial secretions are higher than in serum, although the mechanisms of transepithelial transport and accumulation in these secretions are unknown. To examine SCN- accumulation in secretions, human airway epithelial cells, re-differentiated at the air-liquid interface, were used in open-circuit conditions. [14C]SCN-, in the basolateral medium, was transported across the epithelium and concentrated tenfold at the apical surface. Measurement of the transepithelial potential showed that the basolateral compartment was positive relative to the apical surface (13.7 ± 1.8 mV) and therefore unfavourable for passive movement of SCN-. Transport was dependent on basolateral [SCN-] and saturable (Km,app = 69 ± 25 μM); was inhibited by increased apical [SCN-]; and was dependent on the presence of basolateral Na+. Perchlorate (Ki,app = 0.6 ± 0.05 μM) and iodide (Ki,app = 9 ± 8 μM) in the basolateral medium reversibly inhibited transport, but furosemide did not. Iodide was also transported (Km,app = 111 ± 69 μM). RT-PCR and immunohistochemistry confirmed expression of Na+ - I- symporter (NIS) in the airways. SCN- transport was insensitive to apical disulphonic acid Cl- channel blockers, but sensitive to apical glibenclamide and arylaminobenzoates. Forskolin and dibutyryl cAMP increased transport. These data suggest SCN- transport may occur through basolateral NIS-mediated SCN- concentration inside cells, followed by release through an apical channel, perhaps cystic fibrosis transmembrane conductance regulator.
AB - Human airway mucosa synthesizes and secretes lactoperoxidase (LPO). As H2O2 and thiocyanate (SCN-) are also present, a functional LPO antibacterial defence system exists in the airways. SCN- concentrations in several epithelial secretions are higher than in serum, although the mechanisms of transepithelial transport and accumulation in these secretions are unknown. To examine SCN- accumulation in secretions, human airway epithelial cells, re-differentiated at the air-liquid interface, were used in open-circuit conditions. [14C]SCN-, in the basolateral medium, was transported across the epithelium and concentrated tenfold at the apical surface. Measurement of the transepithelial potential showed that the basolateral compartment was positive relative to the apical surface (13.7 ± 1.8 mV) and therefore unfavourable for passive movement of SCN-. Transport was dependent on basolateral [SCN-] and saturable (Km,app = 69 ± 25 μM); was inhibited by increased apical [SCN-]; and was dependent on the presence of basolateral Na+. Perchlorate (Ki,app = 0.6 ± 0.05 μM) and iodide (Ki,app = 9 ± 8 μM) in the basolateral medium reversibly inhibited transport, but furosemide did not. Iodide was also transported (Km,app = 111 ± 69 μM). RT-PCR and immunohistochemistry confirmed expression of Na+ - I- symporter (NIS) in the airways. SCN- transport was insensitive to apical disulphonic acid Cl- channel blockers, but sensitive to apical glibenclamide and arylaminobenzoates. Forskolin and dibutyryl cAMP increased transport. These data suggest SCN- transport may occur through basolateral NIS-mediated SCN- concentration inside cells, followed by release through an apical channel, perhaps cystic fibrosis transmembrane conductance regulator.
UR - http://www.scopus.com/inward/record.url?scp=9244227025&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=9244227025&partnerID=8YFLogxK
U2 - 10.1113/jphysiol.2004.071548
DO - 10.1113/jphysiol.2004.071548
M3 - Article
C2 - 15345749
AN - SCOPUS:9244227025
VL - 561
SP - 183
EP - 194
JO - Journal of Physiology
JF - Journal of Physiology
SN - 0022-3751
IS - 1
ER -