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• W1995756821 abstract "Striated muscle of the esophagus was until recently considered to consist of classical skeletal muscle fibers innervated by cholinergic vagal motoneurons. The recently described co-innervation originating from enteric neurons expressing nNOS, VIP, NPY, and galanin added a new dimension of complexity. The aim of this study was to summarize current knowledge about, and to get further hints as to the possible function of enteric co-innervation of striated esophageal muscle fibers. Aldehyde fixed rat esophagi were processed for immunocytochemistry for CGRP or VAChT (to demonstrate vagal motor terminals), nNOS/NADPH-d, VIP, NPY, and galanin (to demonstrate enteric terminals), met-enkephalin, mu opiate receptor, muscarinic receptors m1-3, soluble guanylyl cyclase, and cGMP dependent kinase type I and II. Motor endplates were visualized using fluorochrome tagged alpha-bungarotoxin to label nicotinic receptors, or with AChE histochemistry. Besides light and confocal laser scanning microscopy, immuno electron microscopy was also employed. Up to 80% of motor endplates were co-innervated. In addition to nNOS, VIP, NPY, and galanin, many enteric terminals in esophageal motor endplates expressed met-enkephalin. Some appeared to stain for the muscarinic m(2) receptor. There was prominent immunostaining for the micro opioid receptor in the sarcolemma at both junctional and extrajunctional sites. Immunostaining for soluble guanylyl cyclase was prominent immediately beneath the clusters of nicotinic receptors. Enteric varicosities and vagal terminals intermingled in motor endplates often without intervening teloglial processes. During ontogeny, initially high co-innervation rates were reduced to adult levels in a cranio-caudally progressing manner. We conclude that, in addition to a possible nitrergic, VIP-, NPY-, and galaninergic modulation of neuromuscular transmission by enteric neurons, opioidergic mechanisms could play a role. On the other hand, cholinergic influence on enteric neurons may be exerted also by the nucleus ambiguus via motor endplates, in addition to the input from the dorsal motor nucleus. The observations that enteric nerve fibers contact striated muscle fibers at specialized sites, i.e., motor endplates, and that these contacts appear in an ordered cranio-caudal sequence after cholinergic motor endplates have been established point to a specific function in neuronal control of esophageal muscle rather than to be an unspecific hangover from the smooth muscle past of this organ." @default.
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• W1995756821 date "2001-01-01" @default.
• W1995756821 modified "2023-10-16" @default.
• W1995756821 title "Enteric co-innervation of striated muscle fibers in the esophagus: Just a ?hangover??" @default.
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• W1995756821 doi "https://doi.org/10.1002/1097-0185(20010101)262:1<41::aid-ar1009>3.0.co;2-u" @default.
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