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MEMBRANE TRANSPORTERS, ION CHANNELS, AND PUMPS
Departments of 1Physiology and 2Animal Science, University of Minnesota, St. Paul, Minnesota; and 3Department of Veterinary Pharmacology, Seoul National University, Seoul, Republic of Korea
Submitted 16 September 2005 ; accepted in final form 20 November 2005
Human lung epithelial (Calu-3) cells were used to investigate the effects of protease-activated receptor (PAR) stimulation on Cl– secretion. Quantitative RT-PCR (QRT-PCR) showed that Calu-3 cells express PAR-1, -2, and -3 receptor mRNAs, with PAR-2 mRNA in greatest abundance. Addition of either thrombin or the PAR-2 agonist peptide SLIGRL to the basolateral solution of monolayers mounted in Ussing chambers produced a rapid increase in short-circuit current (Isc: thrombin, 21 ± 2 µA; SLIGRL, 83 ± 22 µA), which returned to baseline within 5 min after stimulation. Pretreatment of monolayers with the cell-permeant Ca2+-chelating agent BAPTA-AM (50 µM) abolished the increase in Isc produced by SLIGRL. When monolayers were treated with the cyclooxygenase inhibitor indomethacin (10 µM), nearly complete inhibition of both the thrombin- and SLIGRL-stimulated Isc was observed. In addition, basolateral treatment with the PGE2 receptor antagonist AH-6809 (25 µM) significantly inhibited the effects of SLIGRL on Isc. QRT-PCR revealed that Calu-3 cells express mRNAs for CFTR, the Ca2+-activated KCNN4 K+ channel, and the KCNQ1 K+ channel subunit, which, in association with KCNE3, is known to be regulated by cAMP. Stimulation with SLIGRL produced an increase in apical Cl– conductance that was blocked in cells expressing short hairpin RNAs designed to target CFTR. These results support the conclusion that PAR stimulation of Cl– secretion occurs by an indirect mechanism involving the synthesis and release of prostaglandins. In addition, PAR-stimulated Cl– secretion requires activation of CFTR and at least two distinct K+ channels located in the basolateral membrane.
cystic fibrosis transmembrane conductance regulator; KCNQ1; calcium-activated potassium channels; KCNN4; cAMP
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