Spontaneous electrical activity of interstitial cells of Cajal isolated from canine proximal colon.

Male 0303 health sciences Potassium Channels Colon Electric Conductivity Muscle, Smooth In Vitro Techniques Membrane Potentials Microscopy, Electron 03 medical and health sciences Dogs Animals Calcium Female Calcium Channels
DOI: 10.1073/pnas.86.18.7280 Publication Date: 2006-05-31T11:03:49Z
ABSTRACT
Interstitial cells of Cajal (ICC) have been suggested as pacemaker cells in the gastrointestinal tract. A method was developed to isolate ICC from the slow-wave pacemaker region of the canine proximal colon. These cells were identified under phase-contrast microscopy, and their identity was verified by comparing their ultrastructure with the morphology of ICC in situ. Patch-clamp experiments demonstrated that these cells are excitable; voltage-dependent inward and outward currents were elicited by depolarization. Inward current transients were identified as calcium currents. A portion of the outward current appears to be due to Ca2+-activated K channels commonly expressed in these cells. ICC were also spontaneously active, generating electrical depolarizations similar in waveform to slow-wave events of intact colonic muscles. These findings are consistent with the hypothesis that ICC initiate rhythmicity in the colon.
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