Vagal afferent input from the acid-challenged rat stomach to the brainstem: Enhancement by interleukin-1β
| Autor: | Evelin Painsipp, M. Danzer, Claudia Samberger, Rudolf Schicho, Irmgard Th. Lippe, Peter Holzer |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
medicine.medical_specialty
medicine.drug_class Sialoglycoproteins medicine.medical_treatment Injections Proinflammatory cytokine Rats Sprague-Dawley Internal medicine Cisterna Magna medicine Gastric mucosa Animals Intubation Gastrointestinal Sensitization Afferent Pathways Interleukin-6 Tumor Necrosis Factor-alpha business.industry General Neuroscience Solitary nucleus Receptors Interleukin-1 Vagus Nerve Receptor antagonist Immunohistochemistry Rats Interleukin 1 Receptor Antagonist Protein Cytokine Endocrinology medicine.anatomical_structure Gastric Mucosa Female Tumor necrosis factor alpha Hydrochloric Acid Brainstem business Proto-Oncogene Proteins c-fos Injections Intraperitoneal Brain Stem Interleukin-1 |
| Zdroj: | Neuroscience. 129:439-445 |
| ISSN: | 0306-4522 |
| DOI: | 10.1016/j.neuroscience.2004.07.040 |
| Popis: | Exposure of the gastric mucosa to back-diffusing concentrations of HCl (0.25 M, pH 0.51) stimulates vagal afferent input to the brainstem. Here we have examined whether pretreatment of rats with the proinflammatory cytokines interleukin-1beta and tumor necrosis factor-alpha causes sensitization of vagal afferent pathways to HCl. Rats were pretreated i.p. with interleukin-1beta, tumor necrosis factor-alpha (10 microg/kg) or their vehicle (sterile saline) 24, 48 and 96 h before intragastric administration of HCl (0.25 M, 1 ml/100 g). Activation of neurons in the nucleus tractus solitarii was visualized by c-Fos immunohistochemistry 2 h after the HCl challenge. I.p. administration of interleukin-1beta and tumor necrosis factor-alpha alone induced c-Fos in the brainstem, an effect that was gone after 24 h. At this time, however, the effect of HCl to cause expression of c-Fos in the nucleus tractus solitarii was significantly enhanced by pretreatment with interleukin-1beta and tumor necrosis factor-alpha. The sensitizing effect of i.p.-administered interleukin-1beta was sustained for more than 48 h and prevented by the interleukin-1 receptor antagonist anakinra. Intracisternal administration of interleukin-1beta and tumor necrosis factor-alpha (100 ng) failed to amplify the HCl-evoked expression of c-Fos in the brainstem. These results show that peripheral administration of the proinflammatory cytokines interleukin-1beta and tumor necrosis factor-alpha induces prolonged sensitization of vagal afferent pathways to gastric HCl challenge. This effect seems to arise from a peripheral action on vagal afferents and may be of relevance to gastric chemonociception. |
| Databáze: | OpenAIRE |
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