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Am J Physiol Gastrointest Liver Physiol 262: G1074-G1078, 1992;
0193-1857/92 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 262, Issue 6 1074-G1078, Copyright © 1992 by American Physiological Society

ARTICLES

Patch-clamp recording in myenteric neurons of guinea pig small intestine

L. V. Baidan, A. V. Zholos, M. F. Shuba and J. D. Wood
Department of Physiology, College of Medicine, Ohio State University, Columbus 43210-1238.

The results of our research established the feasibility of applying patch-clamp methods in the study of the cellular neurophysiology of myenteric neurons enzymatically dissociated from adult guinea pig small intestine. Recording in current-clamp mode revealed two populations of neurons. One population discharged repetitively during depolarizing current pulses and displayed anodal-break excitation reminiscent of S/type 1 myenteric neurons. In the second population, spike discharge was limited to one or two spikes at the onset of depolarizing pulses and was similar to the behavior of AH/type 2 neurons. Recording in voltage-clamp mode revealed a complex of overlapping inward and outward whole cell currents. Fast and slow components of inward current were interpreted as sodium and calcium currents, respectively. Outward currents were blocked by cesium and consisted of components with properties of delayed rectifier current and A-type potassium current.


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