Sodium-, chloride-, and mibefradil-sensitive calcium channels in intestinal pacing in wild-type and W/[W.sup.V] mice. Canadian Journal of Physiology and Pharmacology | June 1, 2006| | COPYRIGHT 2006 NRC Research Press. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

Abstract: Pacing of intestinal smooth muscle is driven by a network of cells found in the myenteric plexus called the interstitial cells of Cajal (ICC-MP), which produce a rhythmic pacemaker current. Using intact segments of circular (CM) and longitudinal (LM) muscle from wild-type and W/[W.sup.V] mice, we found that sodium-, chloride-, and mibefradil-sensitive ion channel currents are required for normal pacing to occur. Application of 30 [micro]mol/L and 300 [micro]mol/L lidocaine, 1 mmol/L 4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid (DIDS), 50 nmol/L and 500 nmol/L ...

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