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Am J Physiol Cell Physiol 278: C1031-C1037, 2000;
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Vol. 278, Issue 5, C1031-C1037, May 2000

Pharmacology and modulation of KATP channels by protein kinase C and phosphatases in gallbladder smooth muscle

T. A. Firth1, G. M. Mawe1,2, and M. T. Nelson2

Departments of 1 Anatomy and Neurobiology and 2 Pharmacology, College of Medicine, University of Vermont, Burlington, Vermont 05405

ATP-sensitive K+ (KATP) channels exhibit pharmacological diversity, which is critical for the development of novel therapeutic agents. We have characterized KATP channels in gallbladder smooth muscle to determine how their pharmacological properties compare to KATP channels in other types of smooth muscle. KATP currents were measured in myocytes isolated from gallbladder and mesenteric artery. The potencies of pinacidil, diazoxide, and glibenclamide were similar in gallbladder and vascular smooth muscle, suggesting that the regions of the channel conferring sensitivity to these agents are conserved among smooth muscle types. Activators of protein kinase C (PKC), however, were less effective at inhibiting KATP currents in myocytes from gallbladder than mesenteric artery. The phosphatase inhibitor okadaic acid increased the efficacy of PKC activators and revealed ongoing basal activation of KATP channels by protein kinase A in gallbladder. These results suggest that phosphatases and basal kinase activity play an important role in controlling KATP channel activity.

mesenteric artery; okadaic acid; electrophysiology; adenosine 5'-triphosphate-sensitive potassium channel


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