Intragastric gavage with denatonium benzoate acutely induces neuronal activation in the solitary tract nucleus via the vagal afferent pathway
Journal of Veterinary Science
;
: 459-464, 2014.
Article
Dans Anglais
| WPRIM
| ID: wpr-24555
ABSTRACT
Natural toxic substances have a bitter taste and their ingestion sends signals to the brain leading to aversive oral sensations. In the present study, we investigated chronological changes in c-Fos immunoreactivity in the nucleus tractus solitarius (NTS) to study the bitter taste reaction time of neurons in the NTS. Equal volumes (0.5 mL) of denatonium benzoate (DB), a bitter tastant, or its vehicle (distilled water) were administered to rats intragastrically. The rats were sacrificed at 0, 0.5, 1, 2, 4, 8, or 16 h after treatment. In the vehicle-treated group, the number of c-Fos-positive nuclei started to increase 0.5 h after treatment and peaked 2 h after gavage. In contrast, the number of c-Fos-positive nuclei in the DB-treated group significantly increased 1 h after gavage. Thereafter, the number of c-Fos immunoreactive nuclei decreased over time. The number of c-Fos immunoreactive nuclei in the NTS was also increased in a dose-dependent manner 1 h after gavage. Subdiaphragmatic vagotomy significantly decreased DB-induced neuronal activation in the NTS. These results suggest that intragastric DB increases neuronal c-Fos expression in the NTS 1 h after gavage and this effect is mediated by vagal afferent fibers.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Nerf vague
/
Voies afférentes
/
Adjuvants immunologiques
/
Protéines proto-oncogènes c-fos
/
Rat Sprague-Dawley
/
Noyau du tractus solitaire
/
Récepteurs couplés aux protéines G
/
Composés d'ammonium quaternaire
/
Injections
/
Ligands
Limites du sujet:
Animaux
langue:
Anglais
Texte intégral:
Journal of Veterinary Science
Année:
2014
Type:
Article
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