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Differential activation of medullary vagal nuclei caused by stimulation of different esophageal mechanoreceptors. Brain Res 2011 Jan 12;1368:119-33

Date

10/26/2010

Pubmed ID

20971087

Pubmed Central ID

PMC3014375

DOI

10.1016/j.brainres.2010.10.061

Scopus ID

2-s2.0-78651082829   14 Citations

Abstract

Esophageal mechanoreceptors, i.e. muscular slowly adapting tension receptors and mucosal rapidly adapting touch receptors, mediate different sets of reflexes. The aim of this study was to determine the medullary vagal nuclei involved in the reflex responses to activation of these receptors. Thirty-three cats were anesthetized with alpha-chloralose and the esophagus was stimulated by slow balloon or rapid air distension. The physiological effects of the stimuli (N=4) were identified by recording responses from the pharyngeal, laryngeal, and hyoid muscles, esophagus, and the lower esophageal sphincter (LES). The effects on the medullary vagal nuclei of the stimuli: slow distension (N=10), rapid distension (N=9), and in control animals (N=10) were identified using the immunohistochemical analysis of c-fos. The experimental groups were stimulated three times per minute for 3h. After the experiment, the brains were removed and processed for c-fos immunoreactivity or thioinin. We found that slow balloon distension activated the esophago-UES contractile reflex and esophago-LES relaxation response, and rapid air injection activated the belch and its component reflexes. Slow balloon distension activated the NTSce, NTSdl, NTSvl, DMNc, DMNr and NAr; and rapid air injection primarily activated AP, NTScd, NTSim, NTSis, NTSdm, NTSvl, NAc and NAr. We concluded that different sets of medullary vagal nuclei mediate different reflexes of the esophagus activated from different sets of mechanoreceptors. The NTScd is the primary NTS subnucleus mediating reflexes from the mucosal rapidly adapting touch receptors, and the NTSce is the primary NTS subnucleus mediating reflexes from the muscular slowly adapting tension receptors. The AP may be involved in mediation of belching.

Author List

Lang IM, Medda BK, Shaker R

Authors

Ivan M. Lang DVM, PhD Professor in the Medicine department at Medical College of Wisconsin
Bidyut K. Medda PhD Associate Professor in the Medicine department at Medical College of Wisconsin
Reza Shaker MD Assoc Provost, Sr Assoc Dean, Ctr Dir, Chief, Prof in the Medicine department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

Animals
Brain
Cats
Esophageal Sphincter, Lower
Esophagus
Female
Immunohistochemistry
Laryngeal Muscles
Male
Mechanoreceptors
Medulla Oblongata
Motor Neurons
Muscle Contraction
Pharyngeal Muscles
Proto-Oncogene Proteins c-fos
Solitary Nucleus
Vagus Nerve
jenkins-FCD Prod-398 336d56a365602aa89dcc112f077233607d6a5abc