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Am J Physiol Gastrointest Liver Physiol 277: G127-G136, 1999;
0193-1857/99 $5.00
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Vol. 277, Issue 1, G127-G136, July 1999

Molecular diversity of KV alpha - and beta -subunit expression in canine gastrointestinal smooth muscles

Anne Epperson1, Helena P. Bonner1, Sean M. Ward1, William J. Hatton1, Karri K. Bradley1, Michael E. Bradley2, James S. Trimmer3, and Burton Horowitz1

1 Department of Physiology and Cell Biology and 2 Pharmacology, University of Nevada, School of Medicine, Reno, Nevada 89557; and 3 Department of Biochemistry and Cell Biology, State University of New York, Stony Brook, New York 11794

Voltage-activated K+ (KV) channels play an important role in regulating the membrane potential in excitable cells. In gastrointestinal (GI) smooth muscles, these channels are particularly important in modulating spontaneous electrical activities. The purpose of this study was to identify the molecular components that may be responsible for the KV currents found in the canine GI tract. In this report, we have examined the qualitative expression of eighteen different KV channel genes in canine GI smooth muscle cells at the transcriptional level using RT-PCR analysis. Our results demonstrate the expression of KV1.4, KV1.5, KV1.6, KV2.2, and KV4.3 transcripts in all regions of the GI tract examined. Transcripts encoding KV1.2, KVbeta 1.1, and KVbeta 1.2 subunits were differentially expressed. KV1.1, KV1.3, KV2.1, KV3.1, KV3.2, KV3.4, KV4.1, KV4.2, and KVbeta 2.1 transcripts were not detected in any GI smooth muscle cells. We have also determined the protein expression for a subset of these KV channel subunits using specific antibodies by immunoblotting and immunohistochemistry. Immunoblotting and immunohistochemistry demonstrated that KV1.2, KV1.4, KV1.5, and KV2.2 are expressed at the protein level in GI tissues and smooth muscle cells. KV2.1 was not detected in any regions of the GI tract examined. These results suggest that the wide array of electrical activity found in different regions of the canine GI tract may be due in part to the differential expression of KV channel subunits.

potassium; ion channel; complementary deoxyribonucleic acid; slow wave


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