5-HT 3 receptors mediate the time-dependent vagal afferent modulation of nociception during chronic food allergen-sensitized visceral hyperalgesia in rats
| Autor: | Jian-Zhong Mo, Wen-Wei Gao, Yi Li, Xiao Dong, Shifu Xiao, Hong-Zhuan Chen, Junmin Li, Liwei Zhang, Shiwen Chen |
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| Rok vydání: | 2009 |
| Předmět: |
Male
medicine.medical_specialty Serotonin Time Factors Physiology medicine.medical_treatment Pain Stimulation Vagotomy Catheterization Granisetron Rats Sprague-Dawley chemistry.chemical_compound Internal medicine Noxious stimulus Medicine Animals Mast Cells Neurons Afferent Intestinal Mucosa 5-HT receptor Endocrine and Autonomic Systems business.industry Gastroenterology Visceral pain Vagus Nerve Allergens Rats Protein Subunits Nociception Endocrinology chemistry Capsaicin Hyperalgesia Anesthesia Serotonin Antagonists medicine.symptom Receptors Serotonin 5-HT3 business Food Hypersensitivity |
| Zdroj: | Neurogastroenterology and motility : the official journal of the European Gastrointestinal Motility Society. 21(11) |
| ISSN: | 1365-2982 |
| Popis: | Converging lines of evidence demonstrate a vagally mediated antinociceptive pathway in animals undergoing acute visceral insults, the contribution of this system to visceral pain following chronic noxious stimuli is unknown. 5-HT(3) receptor (5-HT(3)Rs) on spinal afferents are crucially involved in nociceptive processing, the role of 5-HT(3)Rs on vagal afferents is unclear. The aim of the present study was to determine the contribution of vagal afferents to visceral nociception in rats undergoing chronic luminal allergen stimulation and whether it involves vagal 5-HT(3)Rs. Sensitized rats received chicken egg albumin (EA, 1 mg mL(-1)) in drinking water for 2 weeks (day 1-14). Visceromotor response (VMR) to colorectal distension [colorectal distension (CRD), 60 mmHg] and the levels of mRNA encoding 5-HT(3)R (including 3A and 3B subunits) in the nodose ganglia (NG) were evaluated on day 2, 4, 8 and 15. Chronic EA challenge induced gradually increased visceral nociception, with a peak on day 15. Subdiaphragmatic vagotomy or functional deafferentation with capsaicin abolished this time-dependent manner, inducing hyperalgesia from day 2, lasting to day 15. Intraluminal infusion of a 5-HT(3)R antagonist (granisetron), whether alone or infused after local mucosa anaesthetic with 1% lidocaine, mimicked the effects of vagotomy. The mRNA levels for 5-HT(3B) or 5-HT(3A) subunit in the NG showed an opposite time-course to that of visceral pain, which increased from day 2, then decreased gradually to levels lower than those of controls. Our results demonstrate a time-dependent vagal afferent modulation of chronic allergen-sensitized visceral hyperalgesia, which may involve a 5-HT(3)R pathway. |
| Databáze: | OpenAIRE |
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