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Previous Article | Next Article
The Journal of Neuroscience, February 15, 2000, 20(4):1393-1403
Interstitial Cells of Cajal Mediate Cholinergic Neurotransmission from Enteric Motor Neurons
Sean M. Ward, Elizabeth A. H. Beckett, XuanYu Wang, Fred Baker, Mohammad Khoyi, and Kenton M. Sanders Department of Physiology and Cell Biology, University of Nevada School of Medicine, Reno, Nevada 89557
Interstitial cells of Cajal (ICC) are interposed between enteric neurons and smooth muscle cells in gastrointestinal muscles. The role of intramuscular ICC (IC-IM) in mediating enteric excitatory neural inputs was studied using gastric fundus muscles of wild-type animals and W/Wv mutant mice, which lack IC-IM. Excitatory motor neurons, labeled with antibodies to vesicular acetylcholine transporter or substance-P, were closely associated with IC-IM. Immunocytochemistry showed close contacts between enteric neurons and IC-IM. IC-IM also formed gap junctions with smooth muscle cells. Electrical field stimulation yielded fast excitatory junction potentials in the smooth muscle that were blocked by atropine. Neural responses were greatly reduced in muscles of W/Wv animals. Loss of cholinergic responses in W/Wv muscles seemed to be caused by the loss of close synaptic contacts between motor neurons and IC-IM, because these muscles were not less responsive to exogenous acetylcholine than were wild-type muscles. W/Wv muscles also responded to excitatory nerve stimulation when the breakdown of acetylcholine was blocked by neostigmine. The density of cholinergic nerve bundles within the muscles was not significantly different in wild-type and W/Wv muscles, and similar amounts of 14[C]choline were released from preloaded wild-type and W/Wv muscles in response to nerve stimulation. The impact of losing IC-IM on gastric compliance was also evaluated in intact stomachs. Pressure increased as a function of fluid volume and infusion rate in wild-type animals, but W/Wv animals showed little basal tone and minimal increases in pressure with fluid infusions. These data suggest that IC-IM play a major role in receiving cholinergic excitatory inputs from the enteric nervous system in the murine fundus.
Key words: interstitial cells of Cajal; enteric nervous system; cholinergic neurotransmission; neuromuscular junction; acetylcholinesterase; gastrointestinal tract
Copyright © 2000 Society for Neuroscience 0270-6474/00/2041393-11$05.00/0
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