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J Physiol Volume 546, Number 3, 751-763, February 1, 2003 DOI: 10.1113/jphysiol.2002.033365
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J Physiol (2003), 546.3, pp. 751-763
© Copyright 2002 D 2003 The Physiological Society
DOI: 10.1113/jphysiol.2002.033365

Involvement of intramuscular interstitial cells in nitrergic inhibition in the mouse gastric antrum

H. Suzuki *, S. M. Ward †, Y. R. Bayguinov †, F. R. Edwards ‡ and G. D. S. Hirst ‡

‡ Department of Zoology, University of Melbourne, Victoria 3010, Australia, * Department of Physiology, Medical School, Nagoya City University, Mizuho-ku, Nagoya 467, Japan and † Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, NV, USA

Intracellular recordings were made from isolated bundles of the circular muscle layer of mouse gastric antrum and the responses evoked by stimulating intrinsic nerve fibres were examined. Transmural nerve stimulation evoked a fast inhibitory junction potential (fast-IJP) which was followed initially by a smaller amplitude long lasting inhibitory junction potential (slow-IJP) and a period of excitation. The excitatory component of the response was abolished by atropine, suggesting that it resulted from the release of acetylcholine and activation of muscarinic receptors. Fast-IJPs were selectively reduced in amplitude by apamin and slow-IJPs were abolished by Nomega-nitro-L-arginine. Slow-IJPs were associated with a drop in membrane noise, suggesting that inhibition resulted from a reduced discharge of unitary potentials by intramuscular interstitial cells of Cajal (ICCIM). The chloride channel blocker, anthracene-9-carboxylic acid, reduced the discharge of membrane noise in a manner similar to that detected during the slow-IJP. When recordings were made from the antrum of W/WV mice, which lack ICCIM, the cholinergic and nitrergic components were absent, with only fast-IJPs being detected. The observations suggest that neurally released nitric oxide selectively targets ICCIM causing a hyperpolarization by suppressing the discharge of unitary potentials.



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