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pubmed-article:10895990pubmed:abstractTextSerotonin, acetylcholine and substance P are mediators involved in the secretory response to cholera toxin in the small intestine. The aim of this study was to investigate the regional difference in the effect of a serotonin receptor type 3 antagonist (ondansetron), a nicotinic receptor antagonist (hexamethonium), and a substance P antagonist (the neurokinin receptor type 1 antagonist, CP 99,994) on the cholera toxin-induced fluid accumulation in the porcine jejunum. A dose-range of cholera toxin (0.32-56.00 microg/loop) was instilled for 4 hr in ligated loops in two regions of the proximal jejunum in 6-8-week-old pigs. Ondansetron (200 microg/kg), hexamethonium (10 mg/kg), CP 99,994 (1 mg/kg), or saline alone (control) were given intravenously 10 min. before cholera toxin instillation. Cardiovascular parameters, blood gas data, net fluid accumulation, serotonin and electrolyte concentration in the accumulated fluid were measured. Cardiovascular and blood gas parameters were within the normal range in all treatments. The apparent maximal response in fluid accumulation was reduced 20% in case of ondansetron, and by 33% using CP 99,994 in the aboral region compared to control, whereas no effect was observed in the oral region. Hexamethonium reduced the apparent maximal secretory response in both the oral and aboral regions by 45%. None of the treatments with antagonists changed the luminal content of serotonin or the electrolyte concentrations in the accumulated fluid. The results demonstrate that the involvement of serotonin receptor type 3 and neurokinin type 1 receptors in the transductional pathway of cholera toxin-induced fluid accumulation vary significantly within the jejunum, while the cholinergic (nicotinic) transmission plays an even role.lld:pubmed
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pubmed-article:10895990pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:10895990pubmed:articleTitleRegional differences in neurogenic signal transduction pathway of cholera toxin-induced fluid, electrolyte and serotonin accumulation in the porcine jejunum.lld:pubmed
pubmed-article:10895990pubmed:affiliationDepartment of Anatomy and Physiology, The Royal Veterinary and Agricultural University, Frederiksberg, Denmark.lld:pubmed
pubmed-article:10895990pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10895990pubmed:publicationTypeComparative Studylld:pubmed
pubmed-article:10895990pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed