Involvement of catecholaminergic neurons in motor innervation of striated muscle in the mouse esophagus
Autor: | Piet van der Keylen, Daniel Sommer, Winfried Neuhuber, Fabian Garreis, Jürgen Wörl, Ruth Steigleder |
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Rok vydání: | 2015 |
Předmět: |
0301 basic medicine
Male medicine.medical_specialty Histology Biology 03 medical and health sciences Mice 0302 clinical medicine Catecholamines Esophagus Internal medicine Vesicular acetylcholine transporter medicine Animals Molecular Biology Myenteric plexus Catecholaminergic Nucleus ambiguus Neurons Cell Biology Choline acetyltransferase Immunohistochemistry Muscle Striated Mice Inbred C57BL Medical Laboratory Technology 030104 developmental biology Endocrinology Cholinergic Catecholaminergic cell groups Enteric nervous system Female 030217 neurology & neurosurgery |
Zdroj: | Histochemistry and cell biology. 145(5) |
ISSN: | 1432-119X |
Popis: | Enteric co-innervation is a peculiar innervation pattern of striated esophageal musculature. Both anatomical and functional data on enteric co-innervation related to various transmitters have been collected in different species, although its function remains enigmatic. However, it is unclear whether catecholaminergic components are involved in such a co-innervation. Thus, we examined to identify catecholaminergic neuronal elements and clarify their relationship to other innervation components in the esophagus, using immunohistochemistry with antibodies against tyrosine hydroxylase (TH), vesicular acetylcholine transporter (VAChT), choline acetyltransferase (ChAT) and protein gene product 9.5 (PGP 9.5), α-bungarotoxin (α-BT) and PCR with primers for amplification of cDNA encoding TH and dopamine-β-hydroxylase (DBH). TH-positive nerve fibers were abundant throughout the myenteric plexus and localized on about 14% of α-BT-labelled motor endplates differing from VAChT-positive vagal nerve terminals. TH-positive perikarya represented a subpopulation of only about 2.8% of all PGP 9.5-positive myenteric neurons. Analysis of mRNA showed both TH and DBH transcripts in the mouse esophagus. As ChAT-positive neurons in the compact formation of the nucleus ambiguus were negative for TH, the TH-positive nerve varicosities on motor endplates are presumably of enteric origin, although a sympathetic origin cannot be excluded. In the medulla oblongata, the cholinergic ambiguus neurons were densely supplied with TH-positive varicosities. Thus, catecholamines may modulate vagal motor innervation of esophageal-striated muscles not only at the peripheral level via enteric co-innervation but also at the central level via projections to the nucleus ambiguus. As Parkinson's disease, with a loss of central dopaminergic neurons, also affects the enteric nervous system and dysphagia is prevalent in patients with this disease, investigation of intrinsic catecholamines in the esophagus may be worthwhile to understand such a symptom. |
Databáze: | OpenAIRE |
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