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Interstitial cells of Cajal (ICC) generate the electrical slow wave required for normal gastrointestinal motility. The ionic conductances expressed in human intestinal ICC are unknown. The aim of this study was to determine expression of a Na+ current in human intestinal ICC and to determine the effects of the Na+ current on the slow wave. Visually(More)
Tetrodotoxin-resistant Na+currents are expressed in a variety of muscle cells including human jejunal circular smooth muscle (HJCSM) cells. The aim of this study was to determine the molecular identity of the pore-forming alpha-subunit of the HJCSM Na+ channel. Degenerate primers identified a cDNA fragment of 1.5 kb with 99% nucleotide homology with human(More)
BACKGROUND & AIMS Sodium channels are key regulators of neuronal and muscle excitability. However, sodium channels have not been definitively identified in gastrointestinal smooth muscle. The aim of the present study was to determine if a Na(+) current is present in human jejunal circular smooth muscle cells. METHODS Currents were recorded from freshly(More)
Nitric oxide (NO) and carbon monoxide (CO) seem to be neurotransmitters in the brain. The colocalization of their respective biosynthetic enzymes, neuronal NO synthase (nNOS) and heme oxygenase-2 (HO2), in enteric neurons and altered intestinal function in mice with genomic deletion of the enzymes (nNOS(Delta/Delta) and HO2(Delta/Delta)) suggest(More)
Postganglionic parasympathetic neurons of the opossum gallbladder were studied using morphological and intracellular electrophysiological recording techniques. On average there were 17 ganglia/cm2 with 8 neurons/ganglion arranged as loosely or densely packed clusters. Intracellular injection of horseradish peroxidase identified two types of neurons. Most of(More)
Electrical activity and synaptic responses were recorded intracellularly in 415 neurons of the mouse superior mesenteric ganglion (SMG) attached to a segment of distal colon in vitro. Eighty-seven percent of neurons tested received ongoing nicotinic cholinergic fast excitatory postsynaptic potentials (fEPSPs). Colonic distension caused an initial transient(More)
The gaseous molecule hydrogen sulfide (H(2)S) has been proposed as an endogenous signal molecule and neuromodulator in mammals. Using a newly developed method, we report here for the first time the ability of intact and living brain and colonic tissue in the mouse to generate and release H(2)S. This production occurs through the activity of two enzymes,(More)
The American Journal of Physiology: Gastrointestinal and Liver Physiology (ISSN-0193-1857) is published monthly (two volumes a year) by the American Physiologi-tions from outside the United States are payable in U.S. currency or full equivalent. Subscriptions are accepted on a calendar-year basis only. Single Copies; Back Issues: When available, $15.00 each(More)
The factors underlying the survival and maintenance of interstitial cells of Cajal (ICC) are not well understood. Loss of ICC is often associated with loss of neuronal nitric oxide synthase (nNOS) in humans, suggesting a possible link. The aim of this study was to determine the effect of neuronal NO on ICC in the mouse gastric body. The volumes of ICC were(More)
Intestinofugal afferent neurones (IFANs) are a unique subset of myenteric ganglion neurones that regulate normal gastrointestinal function. The IFANs relaying mechanosensory information to sympathetic neurones of the prevertebral ganglion (PVG) function as volume detectors. It is possible that mechanosensory information arriving in the PVG via axon(More)