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11861331

Source:http://linkedlifedata.com/resource/pubmed/id/11861331

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pubmed-article:11861331pubmed:abstractText1. The influence of 5-hydroxytryptamine (5-HT) receptor agonists and antagonists on the ureter motility was investigated in vivo on intact ureters of anaesthetized pigs. Drugs were administered intravenously or topically. 2. 5-HT induced a dose-dependent increase in the frequency of ureter contractions in anaesthetized pigs when given intravenously (0.0001-1 mg kg(-1); ED(50) 0.066 mg kg(-1)) or topically (0.001-1 mg ml(-1); EC(50) 0.043 mg ml(-1)). Significant increases in heart rate and blood pressure were observed when the drug was given intravenously but not topically. 3. The 5-HT(2A) agonist, DOI (1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane) increased the frequency of ureteral contractions in a dose-dependent manner (1-300 microg kg(-1) i.v.). Calculation of ED(50) indicated this compound to be about 1.5 times more potent with an efficacy of 23% compared to 5-HT. 4. The 5-HT(2A/2C) antagonist, ketanserin (0.5 mg kg(-1)) and the 5-HT(2C) antagonist, methysergide (1 mg kg(-1)) antagonized the 5-HT-induced ureter peristalsis when given intravenously. Contraction amplitude, blood pressure and heart rate were not affected by the antagonists. 5. Intravenous (0.0001-1 mg kg(-1)) and topical (0.0001-1 microg ml(-1)) ketanserin significantly decreased the frequency of spontaneous ureteral contractions to about 30% of controls, which could be partly reversed by 5-HT (0.3 mg kg(-1) i.v.). The contraction amplitude, contractions of the contralateral, saline perfused ureter, heart rate and mean arterial blood pressure were not affected. 6. Thus, contractility of porcine ureter is mediated by 5-HT(2) receptors. Their antagonists ketanserin and methysergide seem to be promising drugs for treatment of acute ureteric colic or in preparing the ureter for ureteroscopy.lld:pubmed
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pubmed-article:11861331pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:11861331pubmed:articleTitleEffects of ketanserin and DOI on spontaneous and 5-HT-evoked peristalsis of the pig ureter in vivo.lld:pubmed
pubmed-article:11861331pubmed:affiliationInstitute of Veterinary Pharmacology, University of Bern, 3012 Bern, Switzerland.lld:pubmed
pubmed-article:11861331pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11861331pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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