| Autor: | Carine Strup, C. Marquette, Denis Mathé, Jocelyne Aigueperse, Christine Linard |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
medicine.medical_specialty
Physiology business.industry Gastroenterology Neuropeptide Ileum Substance P Proinflammatory cytokine chemistry.chemical_compound medicine.anatomical_structure Endocrinology chemistry Capsaicin Internal medicine Medicine business Free nerve ending Neurotensin Sensory nerve |
| Zdroj: | Digestive Diseases and Sciences. 48:688-697 |
| ISSN: | 0163-2116 |
| Popis: | In this study we analyzed the role of substance P (SP) from afferent nerves in ileum contractibility and in the release of inflammatory mediators (neurotensin, Il-1beta, and TNF-alpha) in ileal mucosa and muscularis layers after a 10-Gy gamma-irradiation of the abdomen. Six hours after irradiation, SP concentrations were lower than in control rats, and 3 days after irradiation SP-induced contractile activity was higher. Irradiation significantly increased the levels of neurotensin, Il-1beta, and TNF-alpha in both layers. Pretreatment with capsaicin depleted afferent nerve endings of SP and reduced SP levels by about 50%. Capsaicin treatment reduced SP concentrations further, beyond the levels due to irradiation, thereby suggesting that all sources of SP are affected by irradiation. Capsaicin treatment prevented the irradiation from affecting SP-induced contractile response or increasing neurotensin levels. This finding suggests that SP released by afferent nerve endings controls these functions. Proinflammatory cytokine release was not reduced by capsaicin treatment. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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