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Am J Physiol Cell Physiol 274: C819-C826, 1998;
0363-6143/98 $5.00
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Vol. 274, Issue 3, C819-C826, March 1998

Type II protein kinase A regulates CFTR in airway, pancreatic, and intestinal cells

Wendy K. Steagall1, Thomas J. Kelley1, Rebecca J. Marsick1, and Mitchell L. Drumm1,2

Departments of 1 Pediatrics and 2 Genetics and Center for Human Genetics, Case Western Reserve University, Cleveland, Ohio 44106-4948

The type of protein kinase A (PKA) responsible for cystic fibrosis transmembrane conductance regulator (CFTR) activation was determined with adenosine 3',5'-cyclic monophosphate analogs capable of selectively activating type I or type II PKA. The type II-selective pair stimulated chloride efflux in airway, pancreatic, and colonic epithelial cells; the type I-selective pair only stimulated a calcium-dependent efflux in airway cells. The type II-selective analogs activated larger increases in CFTR-mediated current than did the type I-selective analogs. Measurement of soluble PKA activity demonstrated similar levels stimulated by type I- and type II-selective analogs, creating an apparent paradox regarding PKA activity and current generated. Also, addition of forskolin after the type I-selective analogs resulted in an increase in current; little increase was seen after the type II-selective analogs. Measurement of insoluble PKA activity stimulated by the analogs resolved this paradox. Type II-selective analogs stimulated three times as much insoluble PKA activity as the type I-selective pair, indicating that differential activation of PKA in cellular compartments is important in CFTR regulation.

cystic fibrosis; adenosine 3',5'-cyclic monophosphate; ion channels; cystic fibrosis transmembrane conductance regulator


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