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Effects by silodosin on the partially obstructed rat ureter in vivo and on human and rat isolated ureters
Ist Science San Raffaele, Italy .
Ist Science San Raffaele, Italy .
Ist Science San Raffaele, Italy .
University of Vita Salute San Raffaele, Italy .
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2013 (English)In: British Journal of Pharmacology, ISSN 0007-1188, E-ISSN 1476-5381, Vol. 169, no 1, 230-238 p.Article in journal (Refereed) Published
Abstract [en]

Background and Purpose 1-adrenoceptor (-AR) antagonists may facilitate ureter stone passage in humans. We aimed to study effects by the 1A-AR selective antagonist silodosin (compared to tamsulosin and prazosin) on ureter pressures in a rat model of ureter obstruction, and on contractions of human and rat isolated ureters. Experimental Approach After ethical approval, ureters of male rats were cannulated beneath the kidney pelvis for in vivo ureteral intraluminal recording of autonomous peristaltic pressure waves. A partial ureter obstruction was applied to the distal ureter. Mean arterial blood pressure (MAP) was recorded. Approximate clinical and triple clinical doses of the 1-AR antagonists were given intravenously. Effects by the 1-AR antagonists on isolated human and rat ureters were studied in organ baths. Key Results Intravenous silodosin (0.10.3mgkg1) or prazosin (0.030.1mgkg1) reduced obstruction-induced increases in intraluminal ureter pressures by 2137% or 1840% respectively. Corresponding effects by tamsulosin (0.01 or 0.03mgkg1) were 920%. Silodosin, prazosin and tamsulosin reduced MAP by 1012%, 2526% (P andlt; 0.05), or 1825% (P andlt; 0.05) respectively. When effects by the 1A-AR antagonists on obstruction-induced ureter pressures were expressed as a function of MAP, silodosin had six- to eightfold and 2.5- to eightfold better efficacy than tamsulosin or prazosin respectively. Silodosin effectively reduced contractions of both human and rat isolated ureters. Conclusions and Implications Silodosin inhibits contractions of the rat and human isolated ureters and has excellent functional selectivity in vivo to relieve pressure-load of the rat obstructed ureter. Silodosin as pharmacological ureter stone expulsive therapy should be clinically further explored.

Place, publisher, year, edition, pages
Wiley-Blackwell , 2013. Vol. 169, no 1, 230-238 p.
Keyword [en]
ureter, urolithiasis, pressure, in vivo, alpha(1A)-adrenoceptor, antagonist, uroselectivity
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-93392DOI: 10.1111/bph.12123ISI: 000317679000017OAI: diva2:624493

Funding Agencies|Urological Research Institute||Gester Foundation||Recordati SpA||

Available from: 2013-05-31 Created: 2013-05-31 Last updated: 2014-08-26

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Hedlund, Petter
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Clinical PharmacologyFaculty of Health SciencesDepartment of Clinical Pharmacology
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