Vagal afferent activation induces salivation and swallowing-like events in anesthetized rats
Autor: | Takakazu Yagi, Hirotaka Ueda, Tomoyuki Kuwaki, Ikue Kusumoto-Yoshida, Hideki Kashiwadani, Shouichi Miyawaki, Mayu Suga |
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Rok vydání: | 2016 |
Předmět: |
Male
0301 basic medicine medicine.medical_specialty Physiology medicine.drug_class Vagal afferent Stimulation 03 medical and health sciences 0302 clinical medicine stomatognathic system Swallowing Physiology (medical) Internal medicine Reflex Male rats Animals Medicine Anesthesia Rats Wistar Afferent Pathways business.industry digestive oral and skin physiology Vagus Nerve Muscle relaxant Electric Stimulation Deglutition Rats 030104 developmental biology Endocrinology Mylohyoid muscle Vecuronium bromide Salivation business 030217 neurology & neurosurgery medicine.drug |
Zdroj: | American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 311:R964-R970 |
ISSN: | 1522-1490 0363-6119 |
Popis: | The aim of this study was to clarify the effect of vagal afferent activation on salivation and swallowing-like events. Salivation is part of a reflex induced by stimulation of the oral area during feeding or chewing. Recently, we reported that nausea induced by gastroesophageal reflux (GER) activation produced salivation and swallowing in humans. Here, we investigated the ability of visceral sensation to enhance salivation and swallowing in rodents in order to inform the mechanism of GER-mediated stomatognathic activation. First, we administered LiCl to anesthetized male rats to induce nausea. LiCl significantly increased salivation and increased the activity of the vagal afferent nerve. Next, we simultaneously recorded salivation and swallowing using an electrode attached to the mylohyoid muscle during vagal afferent stimulation in a physiological range of frequencies. Vagal afferent stimulation significantly increased salivation and swallowing-like events in a frequency-dependent manner. A muscle relaxant, vecuronium bromide, diminished the swallowing-like response but did not affect salivation. These results indicate that visceral sensation induces salivation and swallowing-like events in anesthetized rodents through vagal afferent activation. |
Databáze: | OpenAIRE |
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